bluuebunny/crossref_metadata_2025 huggingface dataset:
Minimum Automatic Construction of the Adaptive MIS Based on the User’s Function Requirement
Authors: Xu Guo Zhong , Xue Chao Gai
Published: September 2012

This paper deals with the minimum automatic construction approach to the Management Information Systems (MIS) based on the user’s function requirement. Firstly, the principles of MIS minimum construction are proposed, and the matching problem in the minimum construction is analyzed. Then the contracted conformity degree of the module functions is defined and the matching algorithms of modules in the bottom layer are given. Then, the steps of minimum automatic construction are also presented. Finally, the automatic construction is exemplified, the result of which shows the effectiveness and the feasibility of the method.
Quantum Information Delay Protocol Using Entanglement Swapping
Authors: Li Xiao Yu , Zhi Wei Mei
Published: September 2012

In this paper we provide a quantum information delay protocol using entanglement swapping. By sharing Bell states one person can give the other person some information which cannot be read until he or she lets the latter do. The principles of quantum mechanics guarantee that the protocol is unconditionally secure. When the one decides to let the other get the information, he or she needs only to send some dictates through a public classical channel. So the protocol is easier to carry out and more robust in practice. On the other hand it can be more efficient and more secure than previous protocols.
The Generalized Product Quality's Comprehensive Evaluation Method Based on Entropy Weight Method
Authors: Liu Yang , Wang Jian , Liu Gui Zhen , Liu Li Qun , Wen Bang Chun
Published: September 2012

For getting an objective assessment of product quality efficiently, the comprehensive evaluation method of generalized product quality was used to evaluate products. At the same time, the index weights were determined by entropy weight method. Taking air screener as example in this paper, we used the comprehensive evaluation method of generalized product quality which was based on entropy weight method to evaluate many types of air screeners and used the software which was made with VB to calculate the data, it made the evaluation process more objective and reliable. The result which was got with this method provided the scientific basis for users to choose the products and for companies to improve the product's quality.
The Comparison between the Controlling Algorithms Based on the Shedding Motor
Authors: Tang Ya Ming , Yu Qi , Liu Fei
Published: September 2012

AC Servo-Motor tracking five ploynomial curve could adapt the the change of the textile technology more better than the conjugacy cams.Whith the matlab simulation, the results indicate that single neuron adaptive algorithm is more precise than the PID algorithm and RBF neural network supervising algorithm. It has the practical meaning in improving the shedding mechanism in the textile machine.
Design System and Simulation Control of the 6-DOF Parallel Manipulator
Authors: Vongvit Rattawut , Zhu Hai Tao
Published: September 2012

In this paper presents the design system and simulation control of the 6-DOF parallel manipulator. The moveable platform supported by the six electrical cylinder. The mechanic component and kinematics model are explained, dynamics model using Lagrangian equation and computer model of Joint space control scheme using Simulink and the 6-DOF parallel manipulator systems are show in this paper.
Automatic Tracing and Measuring Crankpin Surface for the Initial Orientation in Non-Circular Grinding
Authors: Shen Nan Yan , Li Jing , Wang Xin Ling
Published: September 2012

It is essential to transform machine tool coordinate to workpiece coordinate accurately before grinding for the uniform distribution of grinding allowance to ensure the high machining precision of each crankpin’s profile and phase angle in non-circular grinding. To position the crankshaft with the even grinding allowance of each crankpin, the strategy for controlling touch trigger probe to realize the automatic tracing measurement for crankpin cylindrical surface is researched based on the measurement device using coordinate measuring principle.
Flexible Distributed Workflow System Research
Authors: Li Ya , Tong Xiong , Wang Hai Rui , Wang Jian Ying , Zhang Zhi Bin
Published: September 2012

The paper addresses the problem of flexible Workflow Management Systems (WFMS) in distributed environment. Concerning the serious deficiency of flexibility in the current workflow systems, we describe how our FlexFlow workflow system meets the requirements of interoperability, scalability, flexibility, dependability and adaptability. With an additional route engine, the execution path will be adjusted dynamically according to the execution conditions so as to improve the flexibility and dependability of the system. A dynamic register mechanism of domain engines is introduced to improve the scalability and adaptability of the system. We describe functionalities, collaborations and process state diagrams of our system. The system is general purpose and open: it has been designed and implemented as a set of CORBA services. The system serves as an example of the use of middleware technologies to provide a fault-tolerant execution environment for long running distributed applications. The system also provides a mechanism for communication of distributed components in order to support inter-organizational WFMS.
A QFD-AHP-Based Approach for Determining Storage Performance Parameters
Authors: Zhao Guang Yan , Sun Yu Feng , Liu Wei
Published: September 2012

Storage Reliability plays an important role for long-term storage products, while degradation of storage performance parameters directly reflects the changes of storage reliability. In this paper, a storage performance parameter determination method was brought forward to select the performance parameters to be monitored during the product storage period and provide support for maintenance guarantee for state-based products and thereby improve the storage reliability level of products. The process and specific methods of storage parameters determination was presented. By analyzed from the product storage profile, storage environment, component internal characteristics, failure modes and mechanisms and other aspects, the performance parameters that may be affected by the storage for different components of product were obtained and thereby characteristic requirements matrix of storage performance parameters were established to determine the weight of characteristic requirements through AHP and evaluation, comparison and optimization of parameters were conduct, and then the product storage performance parameters were determined.
A Fusion Prognostics Framework Based on FMMEA and Bayesian Theory
Authors: Tao Yong Jian
Published: September 2012

Prognostics approaches can assess system reliability in its actual life-cycle conditions, provide advance warning of failure, and reduce system maintenance cost. In all prognostics approaches, identification of appropriate monitored parameters, which can be employed to predict imminent failure, is critical. However traditional approaches, data-driven prognostics and model-based prognostics have their limitations. This paper proposes a fusion prognostics framework, which identifies the appropriate parameters monitored by failure modes, mechanisms and effects analysis (FMMEA), and predicts system remaining useful life by data-driven prognostics based on Bayesian theory. The fusion prognostics framework leverage the strength from both approaches to provide better predictions of remain useful life.
Navigation and Positioning by Using the Insufficient Geomagnetic Components
Authors: Xiao Sheng Hong , Cai Zhi Wu , Xie Yan Min , Bian Shao Feng
Published: September 2012

Geomagnetic field information of the vehicle contains abundant positional information, so the positional information can be derived from the geomagnetic observational value. Firstly, base on the analysis of geomagnetic maps of southeast China, the least square algorithm is used for modeling the local geomagnetism on WMM2010(world magnetic model)database. Then, the optimal positional model can be derived. The simulation has been done, from the simulation results we can see that the mean- squared error of the model in latitude and longitude are about 0.7062 sea mile and 1.8735 sea mile respectively. At last, according to the shortcoming of geomagnetic course system such as costing more time and money in calibration error, the partial geomagnetic field model is applied on correcting the compass variation. The analysis of simulation result indicates that the accuracy has been significantly improved.
Coordinate Transform Methods Used in Dynamic Simulation of Satellite Separation
Authors: Hu Xing Zhi , Chen Xiao Qian , Zhao Yong
Published: September 2012

Direction cosine matrix, Euler angles and quaternions are the common methods for translating vector equations into scalar equations. These methods used in separation simulation lack systematic discussion and comparison. This article is trying to present a proper coordinate transformation method for dynamic analysis of satellite separation. 321 and 123 rotations of Euler angles are proposed to construct the dynamic equations, which is different from simulation of missiles by the rotation of 321 and 231. Both Euler angles and quaternions are adopted to model the separation process of a small satellite that uses the helical compression springs mechanism. Feasibility and practicability of the approach are proved by comparing the simulation results, which are solved in MATLAB and ADAMS software platforms. It is concluded that the method of quaternions is more accurate and efficient in dynamic simulation of satellite separation.
Construction Quality Supervision Game Analysis and Collusion
Authors: Ren Hong , Xu Fei
Published: September 2012

Driven by benefit and asymmetrical information, collusion behaviors occur between Supervisors and construction enterprises in the process of construction quality supervision. By utilizing the game theory, the tripartite gambling behaviors of the real state development, the quality supervisor and the construction enterprise were analyzed. Based on the three-hierarchy organization analysis, a “request—supervision ~ proxy” model was constructed to inspect collusion and incentive mechanism. Related proposals were put forward．
Parametric Design of Axial Piston Pump Based on Secondary Development of Pro/Toolkit
Authors: Sun Yuan Jing , Wang Lei
Published: September 2012

A parametric design system of axial piston pump was built, based on secondary development of Pro/Engineer, in Visual C++ 6.0 development environment, which can improve design efficiency. Taking a piston of axial piston pump as an example, contents and method of parametric design of axial piston pump were expounded.
Application of Torque Control Mode in Drilling & Routing Machine
Authors: Liu Guang Chao , Liu Ming Jun
Published: September 2012

In high speed and accuracy positioning systems, torque control mode can achieve much better dynamic response and easy tuning of PID parameters compared to those of position and speed control modes. By adopting and implementing the improved PID control law with feed forward algorithm, the control system can provide much higher performance at high speed movement.
Scattering of Anti-Plane SH-Wave by the Semi-Cylindrical Gap with Multiple Shallow-Buried Inclusions in Elastic Semi-Space
Authors: Li Hong Liang , Guo Jing , Cai Li Ming
Published: September 2012

Semi-cylindrical gap and Multiple circular inclusions exists widely in natural media, composite materials and modern municipal construction. The scattering field produced by semi-cylindrical gap and multiple circular inclusions determines the dynamic stress concentration factor around the gap and circular inclusions, and therefore determines whether the material is damaged or not. These problems are complicated. It is hard to obtain analytic solutions except for several simple conditions. In this paper, the solution of displacement field for elastic semi-space with semi-cylindrical gap and multiple cylindrical inclusions by anti-plane SH-wave is constructed. In complex plane, considering the symmetry of SH-wave scattering , the displacement field aroused by the anti-plane SH-wave and the scattering displacement field impacted by the gap and the cylindrical inclusions comprised of Fourier-Bessel series with undetermined coefficients which satisfies the stress-free condition on the ground surface are constructed. Through applying the method of multi-polar coordinate system, the equations with unknown coefficients can be obtained by using the displacement and stress condition around the edge of the gap and cylindrical inclusions. According to orthogonality condition for trigonometric function, these equations can be reduced to a series of algebraic equations. Then the value of the unknown coefficients can be obtained by solving these algebraic equations. The total wave displacement field is the superposition of the displacement field aroused by the anti-plane SH-wave and the scattering displacement field. By using the expressions, an example is provided to show the effect of the change of relative location of the cylindrical inclusions.
Research on the Safety of Rear Seat Occupants in the Frontal Collision
Authors: Hong Liang , Wu Yun Teng
Published: September 2012

To study the injury values rear seat occupants sustain in the frontal collision, this paper constructed the simulation model of the rear occupant restraint system of a vehicle model using MADYMO software. The influence of the rear 3-point seatbelt stiffness and retractor locking feature, the rear seat cushion stiffness and angle with the vehicle floor on head injury criterion HIC36, thorax 3ms resultant acceleration T3MS, thorax performance criterion THPC, left and right femur force of rear occupants were analysed through the simulation model. The conclusion shows that HIC36 drops when the seatbelt stiffness increases and retractor locking feature decreases compared to the original values; HIC36, T3MS, left and right femur force become less when the seat cushion stiffness decreases and angle increases compared to the original values.
Effects of Environmental Parameters on Marine Corrosion of Aluminium Alloys
Authors: Dan Zhen Hua , Muto Izumi , Hara Nobuyoshi
Published: September 2012

The marine corrosion of aluminium alloys, AA1100 and AA6061 was investigated in term of the transient of the open circuit potential and polarization behaviors in a simulated marine condition. The pitting potential increased with dilution ratios of artificial seawater. The aluminium alloys passivated at lower potentials in the relatively concentrated solutions. The open circuit potential reached the passive state faster at lower solution temperature than that in higher solution temperature. The pitting potential of AA1100 and AA6061 seems independent of the test solution temperature, and the difference between pitting potential and the corrosion potential became smaller at the lower solution temperature. The involvement of the sulfate compound resulted in the increase in pitting potential and had no effects on the passive current density. The absence of the sulfate ions slowed down the formation rate of the passive film. Especially, the open circuit potential of AA6061 passivated at lower potential due to the absence of the sulfate ions.
Study on Preparation and Mechanical Properties of Ti-PEEK-Cf Laminates
Authors: Pan Lei , Wei Jia Shun , Tao Jie
Published: September 2012

This paper reports the use of hot pressing method for the fabrication process in a fiber metal laminates (FMLs) structure based on polyetheretherketone (PEEK) prepreg and titanium alloy foils. In the first stage of the fabrication process, the curing process of the adhesive was studied. Then, the FMLs was prepared by the hot pressing method, and the tensile properties of the FMLs were analyzed. The results of DSC, tensile test results and NDI of ultrasonic C-scanning showed that the optimum fabrication process of the laminates was: fist adding 0.1MPa pressure when the molding temperature reach 10, then holding 180 mins when the molding temperature reach 200.
Effects of Stitching Parameters on Tensile Strength of FRPs under Hygrothermal Conditions
Authors: Cheng Xiao Quan , Baig Yasir , Li Zheng Neng
Published: September 2012

An investigation based on experimental and analytical approaches was conducted to evaluate the behavior of the stitched laminates under hygrothermal conditions. Tensile strength of laminates under different environmental conditions was predicted using FEM model. Effects of stitching parameters upon strength performance of laminates were studied using FEM model and validity of results was checked by comparing with the experimental results. Test results have shown that hygrothermal environment condition has no significant effect on the tensile strength of unstitched laminates, but improved the strength of stitched laminates significantly. Stitching decreased the tensile strength of laminates under 20°C dry environment; however, it improved the tensile strength under 20°C wet environment. It was also found from analytical results that, the failure strength of stitched laminates is higher for smaller thread radius (R<0.25) and relatively greater (5~6mm) stitching distance (5~6mm).
Modeling Lamb Wave Propagation in Damaged Structures Based upon Spectral Element Method
Authors: Sun Hu , Zhou Li
Published: September 2012

Structural health monitoring based on Lamb wave attracts great attention in large-span structures. Lamb wave propagation in complex structures is very complicated due to multiple reflection and mode conversion at geometrical and material features. For effectively inspecting structural integrity, numerical simulation is employed to for extract damage features. It is essential to develop fast and low-cost simulating methods to study Lamb wave propagation in damaged structures. Spectral element method (SEM) is one of the most attractive methods, which is employed to study wave propagation in damaged structures. A massless spring, coupling the longitudinal and rotational vibration, is proposed to model a transverse crack and analyze wave propagation in a composite cracked beam based on SEM. Cracked spectral element formulation is derived by modeling the crack as the spring, whose stiffness is obtained from laws of fracture mechanics. Due to asymmetry of the crack, extensional and flexural wave modes are reflected and transmitted from an incident flexural wave mode. The proposed model is verified by comparing with conventional finite element analysis. Power reflection and transmission varying with the crack depth is also calculated. The results indicate that power reflection/transmission ratio of a single mode is monotonic, which may provide some quantitative foundations for structural health monitoring.
Inorganic-Organic Hybrid Nanocomposites for Photovoltaic Applications
Authors: Zhang Liang Min
Published: September 2012

Hybrid photovoltaic concepts based on a nanoscale combination of organic and inorganic semiconductors are promising way to enhance the cost efficiency of solar cells through a better use of the solar spectrum, a higher ratio of interface-to-volume, and the flexible processability of polymers. In this work, two types of thin film solar cells have been developed. In both types of solar cells, poly-N-vinylcarbazole (PVK) is used as electron donor, cadmium sulfide (CdS) and titanium dioxide (TiO2) nanocrystals are used as electron acceptors, respectively. Since TiO2 has a wide band gap and can only absorb UV light, in the second type of solar cell, ruthenium dye is used as photo-sensitizer. The preliminary results of photoconductive and photovoltaic characteristics of these two inorganic-organic composites are presented.
Chemical Etching of Dislocations Process on Sapphire
Authors: Xie Xin Jian , Hao Qiu Yan , Liang Li Min , Li Yin Ying , Liu Cai Chi
Published: September 2012

In this work, the preferential chemical etching of dislocations on (0001) sapphire surface was investigated. The sapphire was etched by fused KOH etchant at fixed temperature for different time. The differences in the morphology of the etch pits on c-plane sapphire were observed by the optical microscope and atomic force microscopy. The results show that the optimal condition for dislocation displaying was etching 15 min or 25 min with fused KOH at 290 °C.The morphologies of the etch pits were changed from the triangle to the polygon and three kinds of increscent mechanisms about the etch pits are put forward and discussed in the paper.
Terahertz Response of Metamaterial Split-Ring Resonators: Numerical Analysis and Topology Design
Authors: Xu Wei Kai , Wang Wei
Published: September 2012

Using numerical simulation techniques, the response characteristics of metamaterials split-ring resonators (SRRs) in terahertz region are analyzed. We examine the transmission and dispersion characteristics of several SRRs and show that there are two significant resonances corresponding to electric response and magnetic response, respectively. Based on the topology optimization technique, a terahertz magnetic response of metamaterial for the goal of maximum bandwidth is performed, the results seem to imply that the SRRs structure is the most reasonable topological form for broad magnetic resonance in THz band.
Near-Infrared Detecting Array for High Energy Laser Beam Diagnostics
Authors: Zhang Lei , Wang Zhen Bao , Shao Bi Bo , Yang Peng Ling , Tao Meng Meng
Published: September 2012

A near-infrared detecting array is developed combining photoelectric and calorimetric method together to measure CW beam profile of high energy lasers. Detailed structure and functional modules of this system are described. The system is widely sensitive to the wavelength range of 0.9~1.7μm and the power density range of W/cm2～kW/cm2. It has an effective detecting area of 22cm×22cm with a spatial resolution of 1.1cm and a temporal resolution of 20ms. Experiments show that the uncertainty of the total energy measurement is 10% and the uncertainty of the power density distribution measurement is less than 15%.The measuring system has been successfully applied in the measurement for the far-field beam of high energy lasers.
Directly-Written Metallic Photonic Crystals for Sensor Applications
Authors: Zhang Jian , Zhang Xin Ping , Pang Zhao Guang , Wang Bao Zeng
Published: September 2012

Metallic photonic crystals (MPC) consisting of gold nanowires on a waveguide layer of indium tin oxide (ITO) has been fabricated using interference ablation. A sensor device based on this kind of waveguide MPCs is demonstrated by the measurements on the concentration change in the glucose/water solution. A special definition is formulated for the amplitude sensor signal for such a sensor device, which shows excellent linear dependence on the change in the environmental refractive index.
Simulation of Flat-Top Focus Shaping Using Effect of Polarization in High Numerical Apertures Optical Systems
Authors: Feng Ke , Li Jin Song , Guo Ling
Published: September 2012

Flat-top focus shaping using effect of polarization is investigated theoretically by vector diffraction theory. We demonstrate how to make a properly selected polarization component to achieve a flat-top focus in high numerical apertures optical systems, hence achieving a potential goal of beam shaping. The results show that the values of the polarization angle corresponding to different numerical apertures (NA)values for a flat-top focus and the polarization angle increases on increasing NA for achieving a flat-top focal spot, but the flat-top focal pattern will become -sensitive when NA is larger than 1. One will have to add a diffractive optical element to achieve a flat-top focal spot in NA larger than 1 system.
The Effects of Pump Beam on Cesium Magnetometer Sensitivity
Authors: Li Qing Meng , Zhang Jun Hai , Liu Qiang , Huang Zong Jun , Sun Wei Min
Published: September 2012

This paper described an all-optical cesium atomic magnetometer whose measuring sensitivity achieves 0.3pT/Hz1/2. In order to achieve high measuring sensitivity, the dominant parameter, a circularly polarized pumping laser which is used to polarize the cesium atoms was well discussed. After a series of experimental tests, the relationships between the output signals based on absorptive detection with pump beam were expressed here. When the optical pumping frequency was stabilized to the center of the resonance line Fg =3→Fe=4 of the cesium D1 transition, it was found that the optimum pump beam intensity was 6 mW/cm2 for this kind of magnetometer to achieve its highest sensitivity.
Influence of Pump Light’s Duty Cycle on Cesium Atomic Magnetometer
Authors: Zeng Xian Jin , Zhang Jun Hai , Liu Qiang , Huang Zong Jun , Sun Wei Min
Published: September 2012

Recently, atomic magnetometers have been researched widely for its ultra high sensitivity. But the influence of pump light’s duty cycle on atomic magnetometers has been concerned little. In this paper, we described a sensitive cesium atomic magnetometer based on circular dichroism, which had the advantage of easily locking the probing laser to the necessary frequency. We experimentally investigated the amplitudes and linewidths of magnetic resonance signals at different modulated duty cycle of the pump light. The result indicated that our magnetometer achieved the highest sensitivity at the duty cycle of 30%. It’s valuable for optimizing the sensitivity of most atomic magnetometers.
Optimization of Trapezoid Coupling Grating for Long-Wave Quantum Well Infrared Photodetector
Authors: Wang Rui , Yang Ying Li , Wang Guo Dong , Liu Yin Ying
Published: September 2012

The relative coupling efficiency of trapezoid coupling grating for long-wave quantum well infrared photodetector is calculated by finite difference time domain algorthms. By considering the lateral etching effects in grating fabrication, the relative coupling efficiency with respect to the grating parameters, such as, grating period, grating depth, grating top width and grating bottom width etc, is computed. The calculated results show that the relative coupling efficiency will reach the largest value for the 8.266µm incident infrared light when taking grating period asp=2.55 µm, grating depth as h=0.622 µm , grating top width as d1=1.253µm , grating bottom width as d2=0.626µm , duty ratio as q=0.5 and the ratio of bottom width and top width as α=0.5.
MOCVD Growth and Optical Properties of Self-Assembled InAs/GaAs Quantum Dots
Authors: Tian Peng , Huang Chong Qing , Luo Wen Hua , Liu Jing
Published: September 2012

InAs/GaAs quantum dots structures are grown by meta-organic chemical vapor deposition. The effects of growth temperatures on the structural and optical properties of quantum dots are investigated by the atomic force microscopy and photoluminescence. An areal density of 9.3×109cm2 and a strongly enhanced photoluminescence intensity are obtained at the temperature of 505°C, furthermore, the low and high growth temperature tend to form coalescent islands and decrease the intensity of photoluminescence spectra.
Research of a Small-Scale Building Integrated Photovoltaic Micro-Grid System
Authors: Lv Chun Feng , Wu Ai Guo , Zhang Han , Han Fei
Published: September 2012

The paper presents the design of a small-scale building integrated photovoltaic micro-grid system, which is a master-slave system with bi-directional battery inverter as the core of the system.A photovoltaic energy system and management system are established, which has the function of real-time data monitoring and logging，switches different micro-grid operation mode. On this basis, the photovoltaic cooling water system is presented to solve the decline in peak power generation of the system caused by the increase of the temperature of the photovoltaic panel. Experimental results show that the stability of the system can run in networked mode and island mode, cooling water system of photovoltaic panels improve the total system power generation.
Optical Properties of LaB6: A Computer Aided Simulation
Authors: Yu Ben Hai , Xu Chao , Chen Dong
Published: September 2012

We report ab initio calculations of the structural, elastic and optical properties of the compound LaB6 as a function of pressure. The computation is based on the density functional theory in combination with the generalized gradient approximation functional. The calculated lattice constants and elastic moduli are compared with the theoretical results and a good agreement is found. LaB6 can retain its mechanical stability in the pressure range of 0-20GPa. Besides, the frequency-dependent dielectric function, absorption coefficient and loss function of LaB6 are also obtained. The calculated static dielectric function is 8.8 at 0GPa and 5GPa. The computed results should be testified by experiments.
Study on All-Optical Slow-Light Delays of Stimulated Brillouin Scattering in Photonic Crystal Fibers
Authors: Hu Chun Lian , Hou Shang Lin , Kong Qian , Liu Yan Jun , Xu Yong Zhao
Published: September 2012

The Photonic crystal fiber-based stimulated Brillouin scattering coupled equations are solved by the method of fourth-order Runge-Kutta formula and characteristics. Pulse delay and broadening of the Stokes pulse are studied in different PCFs under the same Stokes wave intensity and the characteristics in the small core PCFs for different ratio are investigated. The simulation results show that small core PCF has better time delay and the smaller the ratio is, the larger the time delay is, and the maximum pulse broadening factor is accordingly larger.
An Automatic Examining-Focus System to Aerial Cameras with CCD
Authors: Zhao Mei , Yang Ming Quan , Guo Fei , Sha Yu Fang
Published: September 2012

A system is put forward which can automatically measure focus and estimate whether the aerial camera is off-focus and the situation of the factual image plane is in the focus depth range or not. The principle, the hardware composition and the software design are discussed in detail. The system acquires examining-focus information with the optical collimate system, receives images information with CCD camera which can be regarded as optoelectric conversion apparatus, processes data with the center of gravity method, and realizes the axial flow of the CCD camera translation with the grating displacement sensor and the digital readout together. Then, the optimum image situation and the image size can be fixed on. The optimum image situation can be used to judge whether the camera is off-focus, and the image size can be used to calculate the focus. The accurate rate of examining focus can reach almost99.87% and the estimation of off-focus or not accords with experiment result of flight. Use this system, the focus of the lens and the situation of the actual image plane can be judged to accord with the technical standards or not, so that image of high quality can be get with aerial camera.
Phase-Only Beam Optimization for GaAs Optical Waveguide Phase Array
Authors: Zhang Yong , Xue Jing Jing , Wu Zhen Sen , Zhang Yu Shi
Published: September 2012

Optical waveguide phased arrays have highlighted advantages than other electro-optical material optical arrays in scanning angle, response speed etc. For diffraction fields of uniform waveguide have strong side-lobes, which have influence on scanning performance of phased arrays. So side-lobes compression is one of the main issues for optical waveguide phased array device development. Based on photoelectric effect, the relations of voltage and phase are analysised. Phase-only array beam control using a Genetic Algorithm, an efficiency-optimized scheme, for uniform optical waveguide array with process errors is proposed. Phase distributions are arranged as randomly increasing distributions and random distributions. The results show phase-only optical waveguide arrays control, without the reconstruction of devices, has fine side-lobes compression effects with -9.89[dB] side-lobes intensity ratio. So the performance of scanning beams gets well improved.
Design of Compact Infrared Zoom Lens System
Authors: Yan A Qi , Wu Deng Shan , Wang Hao , Cao Jian Zhong , Ma Jing Jin , Yang Jian Feng , Zhou Zuo Feng , Wu Li , Zhang Jian , Zhang Zhi
Published: September 2012

Infrared zoom lens system with cooled focal plane array (FPA) detector is widely used in military application. Relevant information about optical design can be got easily, but research on infrared zoom lens system with low cost and high image quality for commercial application is less. This paper design a Compact infrared zoom lens system with only four lenses, using an uncooled focal plane array (FPA) with 384×288 pixels with zoom ratio 3:1. Because of large F number and less lenses, transmission of the whole zoom system is greatly improved. NETD and MRTD of infrared system will be satisfying by this compact design. There is no special surface such as diffractive surface, HOE in zoom lens system, and only Ge and Znse infrared materials are chosen which result in lower production cost of infrared zoom lens system for commercial applications.
The Building of Optical Fiber Network System Using Hetero-Core Fiber Optic Sensors
Authors: Han Yan
Published: September 2012

We proposed a novel optical sensory nerve network using pulse switch sensors. The pulse switch sensor generates light loss similar to pulse signals only when ON/OFF states change. Therefore, it has less influence on communications quality compared with conventional switch sensor modules as sensor multiplicity increases. Our simulated results demonstrated that the proposed system can improve sensor multiplicity while maintaining the communications and measuring performance with the same quality as a conventional system by appropriately adjusting the initial loss of the pulse switch sensors. In particular, where ON/OFF time intervals follow exponential distributions with mean values of 5 and 300 s, respectively, the insertion loss of hetero-core segments inserted into pulse switch sensors is 0.3 dB, and the pulse switch sensors have curvature from 0.05 to 0.18. Under these conditions, our enhanced system can increase sensor multiplicity to 23 while maintaining link availability of almost 100%, a distinction error ratio of less than 1%, and a duplicated error ratio of about 0.5%.
Design of a Cryogenic Terahertz Fourier Transform Spectrometer
Authors: Li Xin Xing , Zhang Xiao Yu , Qin Hua , Zhang Bao Shun
Published: September 2012

With the rapid development of the terahertz technique, many new devices are developed in recent years, and most of them need cryogenic environment. To evaluate the characteristics of these devices at low temperature, a cryogenic terahertz Fourier transform spectrometer system (THz-FTS) is designed and developed. With the different combinations of terahertz sources and detectors, this THz-FTS system can test the frequency response of the detectors, the emission spectrum of the sources, and the transmittance of material in the cryogenic environment at terahertz frequency range and also the basic electrical characteristics of the devices. The cryogenic THz-FTS system is designed multi-functional, low noise and compacted to test both the optical and electrical characteristics of the terahertz devices at low temperature.
Scattering Properties of the Higher-Order Hermite Gaussian Beam
Authors: Qu Tan , Wu Zhen Sen , Li Hai Ying , Li Zheng Jun
Published: September 2012

Based on the derivatives between the fundamental and higher-order Hermite Gaussian beam and the Davis’s one-order approximation of slowly varying function, a general expression of the higher-order Hermite Gaussian beam are presented. Scattering characteristics of higher-order off-axis Hermite Gaussian is investigated. Some selected calculations on the effects of the beam waist width and the beam waist center positioning are described.
Real-Time Opto-Electronic Hybrid Joint-Transform-Correlator for Scene Matching Guidance
Authors: Zhao Xuan Ke , Zhao Qing Wu
Published: September 2012

In this paper, an optoelectronic hybrid processing system for cruise missile scene matching guidance based on convolute structure Joint-Transform-Correlator(JTC) was proposed. By edge detection of input image and binaryzation processing of joint power spectrum, the system can achieve sharper correlation peak and location accuracy. Simulation calculation and optical experiments show that even in noisy background, the system can obtain excellent recognition and location performances with 16frames/s, recognition probability greater than 94%, and location accuracy better than a pixel. It is very advantageous to meet the demands of further improving performance, speed, and shoot accuracy of the cruise missiles.
Performance of Ceramic Coating of MB3 Magnesium Alloy by Micro-Arc Oxidation
Authors: Zheng Shun Qi , Zhu Li Ping , Chang Gui Ru , Lu Chuang , Li Xiao Jing
Published: September 2012

Micro-arc oxidation (MAO) method was used for the surface modification of MB3 magnesium alloy. The morphology feature, phase composition, and chemical composition of the formed ceramic coatings were studied by metallographic microscope, scanning electron microscopy (SEM), XRD, respectively. Drop test has been applied to study the corrosion resistance of MB3 Mg alloy with and without micro-arc oxidation treatment. The present result indicates that, through MAO, ceramic coatings were in-situ fabricated on the surface of MB3 Mg alloy, the micro-arc oxidation coating is relatively dense and uniform, maximum thickness is more than 97μm. The dominant phase of the coating is spinal Mg2SiO4 (Forsterite) and dissociative MgO (Periclase). Drop test shows that after oxidation the corrosion resistance of MB3 Mg alloy is greatly improved.
Adaptive Interleaving Method and its Application to Free Space Optical Communications through Atmospheric Turbulence Channel
Authors: Yang Zhong Hua , Ran Qi Wen , Ma Jing , Tan Li Ying , Wu Shi Chen , Liu Qing Feng , Liao Hui Xi
Published: September 2012

Adaptive interleaving method implemented by a hybrid system is proposed to deal with burst errors caused by long and deep channel fades in free space optical communications (FSOC) through atmospheric turbulence. Actually, considerable memory can be saved by changing the interleaving depth at transmitter and receiver according to the updated burst information from channel estimator. Combining with error correcting codes, anti-burst performance of the proposed method is evaluated by simulations based on channel state information from laser transmission experiments over an 11.8 km urban link. Simulation results show that 1~2 or even higher orders of magnitude of a memory can be saved when comparing with the maximum memory interleaving. The results have proved that the cost of anti-burst performance can be minimized to 10% or even smaller by the adaptive interleaving method when joint use with error correcting codes.
Effects of Core Diameter Variation on the Silicon Photonic Nanowire Soliton Effect Compressor
Authors: He Jun Yan , Meng Wan Jie , Zhao Chu Jun
Published: September 2012

The influences of core diameter variation on silicon photonic nanowire soliton-effect femtosecond pulse compressor at 1550 nm have been numerically analyzed. It is shown that when the core diameter smaller than 355 nm, the compression factor increases and the quality factor and the optimum fiber length decreases with the increasing core diameter; when the core diameter larger than 355 nm, the core diameter has little effect on the optimum fiber length, but the compression factor decreases and the quality factor increases with the increasing core diameter.
Analysis on the Relationship between Burst Errors and Tracking Control Frequency in Satellite-to-Ground Laser Communications
Authors: Ran Qi Wen , Yang Zhong Hua , Ma Jing , Tan Li Ying , Wu Shi Chen , Liu Qing Feng , Liao Hui Xi
Published: September 2012

In this paper, burst errors in uplink communication due to lags of the tracking system control in Satellite to Ground optical link was analyzed in detail. In order to make sure how about these bursts in uplink communication are affected by control frequency can, system model of the satellite terminal was founded, parameters of a satellite in sun synchronous Low Earth Orbit and detectors were set to initialize the simulations. The zenith angle of the link was set in the range of [0°, 70°]. The simulation results showed that the bursts due to lags of the tracking system control were different for communication links, but the bursts can be avoided by raising the control frequency to a certain level if it accessible.
The Imaging Optical Setup in the Spectral Radiance Facility
Authors: Wu Zhi Feng , Dai Cai Hong , Huang Bo , Yu Jia Lin , Ouyang Hui Quan
Published: September 2012

The spectral radiance of the lamps are calibrated in the experiment. Different from the spectral irradiance mode, the spectral radiance involves mirror imaging optics and some instructions must be followed strictly. During the experiment, several different imaging parameters in the spectral radiance transfer were investigated, such as the imaging area, the width of the entrance slits, the solid angle, and the object distance of the imaging optics.
Path Loss of Non-Line-of-Sight Single-Scatter Model
Authors: Wang Tai Rong , Bai Lu , Wu Zhen Sen
Published: September 2012

Based on the single-scatter model of the Non-Line-of-Sight(NLOS), we analyze the effect of the geometric parameter of the transceiver on path loss, such as the receiver field of view(FOV), the transmitter apex angle and so on. And path loss in different visibility and weather conditions are simulated. The simulation results show that increasing the receiver FOV, or reducing the transmitter apex angle or the receiver apex angle can reduce path loss. And visibility and weather have an important effect on path loss.
Application of Real-Time Wavelet Threshold Filtering in FOG Attitude Measurement System
Authors: Tang Xia Qing , Cheng Xu Wei , Zhang Huan , Huang Xiang Yuan
Published: September 2012

A wavelet method is introduced to compensate stochastic errors of FOG attitude measurement system, analysing and comparing threshold and threshold function principle, a new threshold function combining with soft and hard threshold was designed. Adopting data moving window realizes recursive computation and real-time data update and solves filtering signal’s boundary problem with symmetric periodic extension method, and achieves real-time wavelet threshold filter. Experimental results show the feasibility of the real time wavelet threshold method in FOG signal de-noising, the real-time wavelet de-noising algorithm with new threshold function has the advantages of single algorithm. which improves the precision and stability of the FOG.
Sphere-Based Geometrical Calibration Method for Structured Light Surface Measurement Systems
Authors: Douet Jules , Xu Jing , Chen Ken
Published: September 2012

This paper proposes a sphere-based calibration method for the structured light system with unconstrained one projector & one camera, regardless of pattern codification. A 1-pose example of such a method is also proposed and tested. In comparison with a traditional plane translation method of 15 poses, we note an increase in the consistency of more than 10% while the calibration time shrinks to 6% and the calibration accessory is reduced to the size of a flash-light. This method suits well for applications where mobility, speed and ease-of-use are important criteria.
Methods of Determining Optimal Fitting Spherical Surface for Off-Axis Aspheric Optics Finishing
Authors: Xu Xing Zhu , Yun Zhang , Yu Yue Wang , Zhi Jing Feng
Published: September 2012

Most present methods of determining optimal fitting spherical surface for rotationally symmetrical aspheric optics are either unsuitable for off-axis optics or unable to guarantee “the condition of positive removal” (distances from points on desired concave aspheric surface to the center of fitting sphere are all longer than radius of sphere while distances from points on desired convex aspheric surface to the center of fitting sphere are all shorter than radius of sphere). To surmount the two problems, this paper proposes three methods of determining starting spherical surface in finishing/polishing aspheric optics: method of using the function of “lsqlin” provided in Matlab, the modified method of least squares and the method of exhaustive search of tangent spheres. An example is presented to validate the three methods and to demonstrate all of them gain some advantages over conventional one by comparing attributes (normal deviation distribution, maximum normal deviation, volume of material to be removed, rms of normal deviation distribution, etc.) of their optimal fitting spheres against those of sphere obtained by utilizing conventional method.
Ultrafast Electrical Signal Electro-Optic Sampling Test Theory and Test System
Authors: Li Jian Wei , Xu Nan , Li Jian , Zhang Zhi Xin
Published: September 2012

Discussed the principle of electro-optic sampling technique and implementation methods of Ultra-fast electrical signals, the electric field of electro-optical crystal and sampling pulses as well as the interaction between the principle of time scanning unit, established the coplanar waveguide parameters model, and analyzed the technical indicators of test system.
Research of Optical Fiber Degree of Polarization (DOP) Measurement
Authors: Xu Nan , Li Jian Wei , Li Jian , Zhang Zhi Xin
Published: September 2012

Degree of Polarization (DOP) is a very important parameter for light polarization effect. The DOP meter is widely used in optical fiber communication and gyroscope. In this paper, several measurement methods of DOP are compared and analyzed, and also a calibration method of DOP meter is present as well as the measurement results.
A Simple Mechanism to Suppress the Mode Competition for Stable and Tunable Dual-Wavelength Erbium-Doped Fiber Lasers
Authors: Zhang Chen Fang , Sun Jiang , Zheng Si Wen , Jian Shui Sheng
Published: September 2012

A suppressant effect for mode competition of dual-wavelength lasing oscillations induced by polarization hole burning effect in an ordinary erbium-doped fiber is proposed and experimentally demonstrated. The polarization hole burning effect is introduced by an all fiber polarization controller directly fused with a segment of erbium-doped fiber. The mechanism of the all fiber polarization controller to suppress the wavelength competition is described in detail. Results show that the mechanism is helpful to obtain stable dual-wavelength lasing oscillations at room temperature in the erbium-doped fiber laser. By adjusting the comb filter, the wavelength tuning between different dual-wavelength oscillations is realized. The side mode suppression ratio of each lasing wavelength is measured to be more than 55dB. The 3dB bandwidth of each lasing oscillation is 0.01nm and the 30dB bandwidth is 0.10nm. The power fluctuation and wavelength shift are measured to be less than 0.8dB and 0.05nm over 32 minutes for all the dual-wavelength lasing oscillations obtained in the experiment.
A Non-Destructive Method Based on QPSO-RBF for the Measurement of Sugar Content in Cantaloupe
Authors: Gao Li Li , Jia Zhen Hong , Qin Xi Zhong , Huang Xiao Hui , Yao Yong Bo
Published: September 2012

A nondestructive measurement approach is presented in this paper, which is capable of determining sugar content in cantaloupe from the dielectric property. The approach is based on measured equivalent capacitance and equivalent resistance of the cantaloupe, and on data analysis using quantum-behaved particle swarm optimization (QPSO) and Grey radial basis function (RBF) neural network. First, accumulated generating operation (AGO) in Grey forecasting is used to convert the initial observed data to obtain the accumulated data with strong regularity, which are employed to model and train the radial basis function neural network. Second, it adopted quantum-behaved particle swarm optimization algorithm to train the centers and widths of radial basis function. This model not only prevented the problem that the parameters of neural network are hard to be tuned, but also improved the network precision of prediction. Experimental results revealed that the predictive model as proposed has good predictive effect for the measurement of sugar in cantaloupes.