Search query: receiving optical system for laser ranging

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abstract: The maximum ranging distance is a key technical indicator of the pulse laser range finder. It is generally obtained by testing the laser receiving sensitivity of the pulse laser range finder in the laboratory.The existing laser receiving sensitivity test is mainly realized by means of laser analog radiation source and collimating optical system.The laser radiation simulator generally uses a semiconductor laser to transmit the analog laser receiving signal to the focal plane of the collimating optical system through fiber coupling, and then radiates to the receiving aperture of the pulse laser range finder through the collimating optical system. Adjust the intensity of the laser to simulate the energy of the radiation source, and complete the test of the minimum detectable energy, that is, the laser receiving sensitivity.In the actual use process, it is found that the time stability deviation of the radiation power of the semiconductor laser in low power operation can reach 20% which is difficult to meet the requirements of use, and after the fiber coupling, the collimation of the collimating optical system, the radiation uniformity is difficult to fulfil requirements.Based on this, this paper designs a pulse laser range finder receiving sensitivity test equipment based on integrating sphere. The system uses the traditional laser radiation analog source plus attenuator to stabilize the laser radiation source.In the case of a pulsed laser range finder as a sensor in combination with a television or infrared sensor, a tungsten halogen lamp is added inside the integrating sphere to provide infrared or television target simulation,then the optical axis of the pulsed laser range finder and collimating optics can be quickly aligned.
author_names: Fei Xie

Guofeng Zheng

Baolin Du

Peng Zhang
title: Design of receiving sensitivity test system for pulse laser range finder based on integrating sphere
year: 2020

abstract: Abstract In order to suppress the effects of common mode noise, laser ranging and three dimensional imaging systems based on the differential optical path method (DOPM) are proposed. Compared with the traditional method based on single receiver, DOPM uses two receivers which have different optical paths. Based on DOPM, we developed the laser ranging and three dimensional (3D) imaging systems and carried out ranging and three dimensional imaging experiments to research DOPM for practical application. In ranging experiments, the root mean square (RMS) of ranging error decreases from 95 to 70 mm; as a result the error could be decreased to 74% of the method based on a single receiver. Meanwhile, the system obtains the highest sensitivity when differential distance is multiplied by light speed and receiving pulse width. In 3D imaging experiments, compared with the traditional method, the mean RMS of 64 channels based on DOPM decreases from 99 to 65 mm, which decreases to 66% Meanwhile, DOPM improves the range resolution and could distinguish two targets with height difference of 80 mm.
author_names: Hao Qun

Cao Jie

Hu Yao

Mu Jiaxing

Xu Jianchun

Zhai Zichao

Chen Pin
title: Laser ranging and three dimensional imaging systems based on the differential optical path method
year: 2016

abstract: In this paper, the key technologies of single photon detection in airborne laser ranging are analyzed. Aiming at the engineering application, we propose the next investigation of single photon detection. 1) the compensation of pulse propagation in atmosphere; 2) the problem of ranging accuracy for moving targets; 3) high accuracy optical axis coherence of receiving and transmitting. Further research can improve the airborne adaptability of single photon ranging system.
author_names: Jie Fu

Baolin Du

Dezhao Zhou

Lei Li

Yi Yang
title: Researching on single photon detection in airborne laser ranging
venue: Other Conferences
year: 2018

abstract: Using the penetration of blue green band (532 nm) laser in seawater, airborne laser scanning ranging technology can be applied to shallow sea measurements. The penetration properties of lasers due to the complex optical properties of seawater are also limited. The decrease of echo energy received by the sensor will greatly limit the accuracy of laser seabed survey. In response to this phenomenon, we propose a new structural design method combined with the optimal field of view (FOV) for shallow sea measurements to optimize the traditional receiving system to improve the laser receiving depth echo signal receiving capability. The simulation experiment is carried out by ZEMAX optical software. Experimental results show that the improved receiving system can effectively reduce spherical aberration and coma caused by spherical lens, and improve the imaging quality of the receiving system and the measurement accuracy of the shallow seabed.
author_names: Guoqing Zhou

Jiandong Wei

Xiaoping Zhou

Wei Huang

Jian Jhen Chen

Yizhi Tan

HaochengHu Wei
title: Structural Optimization of Receiving System Based on Optimal Field of View for Shallow Sea Laser Measurement
venue: IGARSS 2019 2019 IEEE International Geoscience and Remote Sensing Symposium
year: 2019

abstract: Abstract We are reporting on identification and calibration of one way delays in satellite laser ranging systems. Satellite Laser Ranging (SLR) is a standard technique to measure the distance of satellites as a function of time with millimeter precision and a few millimeters accuracy. For one way laser ranging, laser time transfer ground to space and for bi and multi static laser ranging to space objects identification and measurement of system delays related separately to transmitting and receiving parts of the system are needed. The epochs of transmission and reception of optical signals have to be referred to the coordinated time scale with the accuracy reaching one nanosecond level or better for one way ranging and space debris multi static ranging. For transponder ranging and laser time transfer an even higher accuracy of 50 ps or better is needed. These accuracy requirements are by several orders of magnitude higher in comparison to standard SLR applications. A new procedure of calibration of one way delays related to the SLR systems has been developed and tested. The necessary hardware components needed for calibration measurements were designed and developed in a form of a Calibration Device. It consists of a photon counting detector, an epoch timing device and a dedicated signal cable. The signal propagation delays of these components were determined with an accuracy of better than 20 ps. The signal propagation delay stability of the Calibration Device is on a level of units of picoseconds over days of operation. The Calibration Device and calibration procedure were tested in real measurements at the SLR site in Graz, Austria. The time needed to complete a calibration of one way delays of the SLR system is less than two days. The one way system delays were determined with the accuracy better than 50 ps. The measurement principle, Calibration Device and the first results are presented.
author_names: Ivan Prochazka

Jan Kodet

Josef Blazej

Georg Kirchner

Franz Koidl

Peiyuan Wang
title: Identification and calibration of one way delays in satellite laser ranging systems
year: 2017

abstract: The invention discloses a multielement photon counting laser ranging three dimensional imaging system. The system comprises a laser emitting unit used for emitting beam arrays, a control unit for controlling the beam arrays to be emitted and scanned, a receiving and detecting unit which receives echo optical signals through an optical lens and detects focal plane optical signals through a single photon detector array formed by coupling optical fiber arrays, and a time measurement unit used for recording and analyzing multi channel photon flying time. According to multielement photon counting three dimensional imaging system, the single photon detector array formed by coupling optical fiber arrays is used, multielement photon counting laser ranging of one dimensional laser beam arrays is achieved, one dimensional scanning is performed on the beam arrays in the vertical direction of arrangement of the beam arrays, and photon counting three dimensional laser imaging is achieved.
title: Multielement photon counting laser ranging three dimensional imaging system
year: 2014

abstract: Satellite Laser Raging (SLR) System in Fangshan SLR station had been low sensitivity in receiving the returns from the satellite for a quite long time and no good adoption for the data by users. Some designs and rebuilding work were made to increase the sensitivity for the ranging and the monitoring ability of the ICCD in the optical receiving system of the SLR system described in the paper. The results were satisfied according to the data analysis reports of Delft Orbital Analysis, a SLR data analysis center of International Laser ranging service (ILRS)
author_names: Cheng Bo-hui
title: Rebuilding for optical system in satellite laser ranging system
year: 2007

abstract: In the performance test of the satellite based laser ranging system equipment on earth,optical pulse for simulating distance with high precision,stable and adjustable were needed,then the adjustable distance simulation technology was developed.A adjustable distance simulation system consisting of laser receiving,delay control,high precision signal delay and laser emitting units is designed to simulate distance.The minimum simulation distance of the adjustable distance simulator achiev 15 m,the accuracy superior 0.15 m are proved by experiments,satisfing the demands of the performance test of all kinds of satellite based laser ranging system equipment on earth by now.
author_names: Shu Rong
title: Design of a Adjustable Distance Simulator for Pulsed Laser Ranging System Equipment
year: 2012

abstract: ARGO M is a satellite laser ranging (SLR) system developed by the Korea Astronomy and Space Science Institute with the consideration of mobility and daytime and nighttime satellite observation. The ARGO M optical system consists of 40 cm receiving telescope, 10 cm transmitting telescope, and detecting optics. For the development of ARGO M optical system, the structural analysis was performed with regard to the optics and optomechanics design and the optical components. To ensure the optical performance, the quality was tested at the level of parts using the laser interferometer and ultra high precision measuring instruments. The assembly and alignment of ARGO M optical system were conducted at an auto collimation facility. As the transmission and reception are separated in the ARGO M optical system, the pointing alignment between the transmitting telescope and receiving telescope is critical for precise target pointing. Thus, the alignment using the ground target and the radiant point observation of transmitting laser beam was carried out, and the lines of sight for the two telescopes were aligned within the required pointing precision. This paper describes the design, structural analysis, manufacture and assembly of parts, and entire process related with the alignment for the ARGO M optical system.
author_names: Jakyoung Nah

Jung-Guen Jang

B H Jang

Inwoo Han

Jeong-Yeol Han

Kwijong Park

Hyung-Chul Lim

Sung-Yeol Yu

Eunseo Park

Y K Seo

Il K Moon

Byung-Kyu Choi

Eunjoo Na

Uk-won Nam
title: Development of Optical System for ARGO M
year: 2013

abstract: The designed Active LDR(Laser Detection and Ranging) System contains high power Laser and its diameter is approximately 24mm. Although the laser transmitting channel and receiving optic channel are completely separated from each other and doesn't share any of the optical components in design, each channel shares 4 wedge scanners, which are to overcome the narrow FOV(Field of View) of the optical system. Any backward reflection back to the fiber laser end must be carefully studied since it can damage the LD(Laser Diodes) the inner components of the laser unit because of the high amplification factor of the laser unit. In this study, the stray light caused by the transmitting channel's laser and inner reflection by optical components were analyzed by ASAP(Advanced System Analysis Program) software. We also can confirm the operability and stability of the system by more than 6 months of operation of the system.
author_names: Jinsuk Hong

Hae Seog Koh
title: Backward reflection analysis of transmitting channel of active laser ranging optics
venue: Optics Photonics Optical Engineering Applications
year: 2013