bluuebunny/crossref_metadata_2025 huggingface dataset:
Quasi-distributed acoustic sensing with tripled response bandwidth based on time division multiplexing
Authors: Wang Zitan , Jiang Jialin , Wang Zinan , Xiong Ji , Rao Yunjiang
Published: November 2021

A novel method to enlarge the response bandwidth of quasi-distributed acoustic sensing is proposed, based on pulse compression Φ-OTDR with coherent detection and time-division-multiplexing.
Comb-like Brillouin spectra generated by pulse trains arranged at power intervals for high-resolutional analysis
Authors: Miyake Daiki , Kawakami Shohei , Okawa Miyu , Ito Fumihiko
Published: November 2021

We present novel signal formula for Brillouin analysis, which uses short pulse trains arranged at different power intervals. The obtained spectrum has narrow-band teeth and wide free spectral range, and is applicable to high-accuracy measurements
Impact of optical noises on coded Brillouin optical time-domain analyzers
Authors: Gao Xia , Yang Zhisheng , Wang Sheng , Hong Xiaobin , Sun Xizi , Wu Jian , Thévenaz Luc
Published: November 2021

The impact of optical noises on the performance of coded Brillouin optical time-domain analyzers is modelled and experimentally demonstrated. This enables quantitatively evaluating the actual coding gain at any point along the sensing fiber.
Feasibility Study on the Potential of Fibre Bragg Gratings for Thermal Monitoring of Cylindrical Lithium-Ion Batteries
Authors: Alcock Keith M. , Grammel Markus , Binetti Leonardo , González-Vila Álvaro , Goh Keng , Alwis Lourdes S. M.
Published: November 2021

Bragg Gratings were used to monitor thermal fluctuations of a Lithium-Ion battery by attaching the sensors outside the casing of the battery. Results are comparable to that obtained from thermo-couples and thus verifies its potential.
Numerical Studies of Tailored-Probe Slope Assisted BOTDA
Authors: Shelef Yanir , Shalev Avraham Itzhak , Bhatta Hari Datta , Bohbot Jonathan , Hadar Raanan , Tur Moshe
Published: November 2021

Accurate simulations of Tailored-Probe slope-assisted BOTDA may require the use of a higher-order equation for the acoustic field, especially for large variations of the fiber BFS. Successful application of this approach to various scenarios is demonstrated.
Enhanced Signal Processing of Distributed Brillouin Fiber Sensors using a Decoupled Radial Basis Function Network
Authors: Venketeswaran Abhishek , Lalam Nageswara , Lu Ping , Ohodnicki Paul R. , Chen Kevin P.
Published: November 2021

A novel decoupled radial basis function network (D-RBFN) is proposed to accelerate signal processing and address the big data challenges associated with ultra-long distance Brillouin optical time-domain analysis (BOTDA) systems. The proposed frame- work is demonstrated on a dataset measured over a 100 km distance using a bi-directional Raman assisted BOTDA system.
Enhanced spatial resolution of quasi-distributed weak fiber Bragg grating array sensor based on wavelength- division resonance frequency mapping
Authors: Kim Gyeong Hun , Kim Chang-Seok , Kim Hyunjoo , Kwon Yong Seok , Park Ga-ye , Kim Jaesun
Published: November 2021

We demonstrated the novel quasi-distributed optical fiber sensor with tens of cm spatial resolution based on the wavelength-division resonance frequency mapping technique. To interrogate a weak fiber Bragg grating (FBG) array with a reduced interval length below ~1 m, a wavelength-division optical delay system was employed to separate the adjacent reflections. In our scheme, the sensing head consists of three Bragg wavelengths in the FBG series, which are repeatedly located 15 times along the optical fiber. Thus, 45 weak FBGs can be successfully interrogated using three channels without decreasing the dynamic range of the measured strain or temperature.
Gain-flattening of identical weak FBG array laser sensor using intensity-modulated resonance frequency mapping
Authors: Kim Gyeong Hun , Kim Chang-Seok , Kim Hyunjoo , Kwon Yong Seok , Park Ga-ye , Kim Jaesun
Published: November 2021

We demonstrated a novel intensity-modulated interrogation system for an identical weak fiber Bragg grating (FBG) array based on a resonance frequency mapping technique. To compensate for the signal depletion phenomenon because of the increased reflection number of identical weak FBGs, a gain-flattening technique is employed based on the intensity modulation of the applied driving current in the optical fiber laser sensor cavity. Over 60 identical FBGs can be efficiently interrogated by detecting the resonance frequency of each FBG for a distinguished peak position.
Distributed sparse-wideband vibration sensing with time delay sampling
Authors: Deng Yuanpeng , Liu Qingwen , Chen Dian , He Zuyuan
Published: November 2021

We propose a distributed fiber-optic acoustic sensor based on frequency di- vision multiplexing and periodic pulse sequence. Two vibrations with frequency up to 4.3 kHz are detected with 1 kHz probe pulse sequence injecting rate.
Phase-coded Brillouin Optical Correlation Domain Analysis based on Amplitude Modulation
Authors: Ba Dexin , Li Yue , Yan Jialiang , Zhang Xiaopei , Dong Yongkang
Published: November 2021

A phase-coded Brillouin optical correlation domain analysis (BOCDA) based on amplitude modulation was proposed. Unlike the conventional phase-coded BOCDA which suffers from non-rectangular phase transitions, the proposed phase coding based on amplitude modulation can realize perfect phase switches between 0 and π with zero-width edges. Numerical simulations and experimental results prove that it can effectively suppress the Brillouin amplification in the off-peak positions. In experiment, a 2-mm spatial resolution sensing is realized using only a 20- GHz bandwidth amplitude modulator.
WDM and TDM interrogation by sequentially pulsing direct modulated DFBs
Authors: Perez-Gonzalez A. , Bravo M. , Leandro D. , Perez-Herrera R. , Lopez-Amo M.
Published: November 2021

A new versatile and cost-effective interrogation system by pulsing direct modulated (DM) DFB laser diodes is proposed. 1 pm wavelength resolution and 600 m sensor spacing is demonstrated by sequentially pulsing a DM DFB.
Reaching mK-scale stability in CP-ɸOTDR over daily measurements
Authors: Magalhães Regina , Neves Tiago , Costa Luis , Scherino Lorenzo , Petagna Paolo , Thevenaz Luc , Martin-Lopez Sonia , Gonzalez-Herraez Miguel , Martins Hugo F.
Published: November 2021

We propose several processing methods to mitigate the probability of large errors in Chirped-pulse ɸOTDR, improving performances for long-term measurements. For no perturbation applied, we reach a 2 mK error after a 24 h experiment.
Performance Analysis of Specialty Fiber Optic Cables for Distributed Acoustic Sensing
Authors: Uyar Faruk , Kartaloğlu Tolga , Erol Mustafa , Özbay Ekmel , Ozdur Ibrahim
Published: November 2021

In this work, we present the signal-to-noise ratio comparison results of six different buried fiber optic cable for identical external perturbations using a home-made direct detection φ-OTDR system.
Fading noise reduction for distributed fiber-optic vibration sensor using few-mode fiber
Authors: Wan Yangyang , Fan Xinyu , Jiang Shoulin , Chen Dian , Du Jiangbing , He Zuyuan
Published: November 2021

A fading-noise reduction method is proposed for phase-sensitive OTDR sys- tem to use few-mode fiber and combine backscattered lightwave of different modes. This system can be realized without sacrifice of vibration frequency response bandwidth and the sensitivity.
Investigation on the sensitivity of an etched graded-index multi-mode fiber to refractive index and temperature for mode-multiplexed fiber optic sensor applications
Authors: Alwis L.S.M , Bremer K. , Roth B.
Published: November 2021

The work presents an investigation on the utilization of an etched Graded-Index (GI)- Multi-Mode Fiber (MMF) for mode-multiplexed Fiber Optic Sensor (FOS) applications and the simultaneous measurement of the Surrounding Refractive Index (SRI) and temperature.
Enhancing spatial resolution for BOTDA based on a postprocessing algorithm with nonlinear weight coefficients
Authors: Zhou Dengwang , Dong Yongkang
Published: November 2021

Without adding additional hardware, a post-processing algorithm with nonlinear weight coefficients is proposed to enhance the spatial resolution of BOTDA system meanwhile a unique self-averaging method is conducted to denoise the demodulated Brillouin signals.
Vibration Detection Capacity of DAS Systems in the Field of Railway Applications
Authors: Kabalan Ali , Hammi Tarik , Garbini Gabriel Papaiz , Hamadi Abdelkader , Gabet Renaud , Jaouën Yves
Published: November 2021

We demonstrate the reliability of two coherent detection DAS systems on detecting vibrations generated in a railway environment. Systems have been validated by accelerometers based measurements. A demonstration of a rail vehicle tracking is also performed.
Highly stable Single-Path Dual Comb Generator for Sensing and Spectroscopy Applications
Authors: Soriano-Amat Miguel , Soto Marcelo A. , Durán Vicente , Martins Hugo F. , Martin-Lopez Sonia , Gonzalez-Herraez Miguel , Fernández-Ruiz María R.
Published: November 2021

We propose a novel single-path dual comb generator for sensing applications. The method stands out for its extraordinary stability and flexibility, generating dense and ultra-flat combs allowing to characterize ultra-narrow optical features (e.g. Brillouin gain/loss).
Twist compensation of birefringence in highly asymmetric germanosilicate fibres drawn from 3D printed preforms
Authors: Wang Y. , Canning J. , Lancry M. , Peng G-D.
Published: November 2021

A study on birefringence compensation of highly asymmetric germanosilicate fibre drawn from a 3D printed preform is carried out. Surprisingly large compensation is locked in when twist is released, amounting to more than 80% compensation. Large bandgap attenuation is observed when gratings are written into this fibre.
Narrow linewidth short cavity Brillouin ring laser for BOTDA systems
Authors: Rossi Leonardo , Marini Diego , Bastianini Filippo , Bolognini Gabriele
Published: November 2021

We analyze a new short-cavity layout for Brillouin sensing with a Brillouin ring laser source. The new source exhibits ultra narrow linewidth (10 kHz), good conversion efficiency and low RIN (~- 145 dB/Hz), providing the basis for an improved BOTDA BRL pump-probe source.
Interrogation of FBG sensor by a smartphone
Authors: Markvart Aleksandr A. , Liokumovich Leonid B. , Ushakov Nikolai A.
Published: November 2021

Smartphone-based interrogation of FBG sensor is reported for the first time. Setup consists of a smartphone and low cost off-the shelf available components: a section of DVD disk, razor blade slit and a 3D-printed holder. Smartphone flashlight LED was used as a light source, and FBG spectra were projected on the smartphone camera by a DVD disk.
On chip fast FBG interrogator based on a Silicon on Insulator ring resonator add/drop filter
Authors: Tozzetti L. , Giacobbe A. , Pasquale F. Di , Faralli S.
Published: November 2021

A fast FBG sensor interrogator based on a SOI ring resonator (RR) filter is presented. The measurement of the Bragg wavelength shift is based on the detection of the signals at the output ports of the RR. Ring resonance wavelength is tuned and fixed by an integrated heater and the ring acts as a passband filter for the reflected FBG spectrum.
Silicon Photonics-Based Laser Modules for FM-CW LIDAR and RFOG
Authors: Ayotte S. , Costin F. , Babin A. , Paré-Olivier G. , Girard-Deschênes É. , Morin M. , Filion B. , Bédard K. , Chrétien P. , Bilodeau G. , Perron L.-P. , Davidson C.-A. , D'Amato D. , Laplante M. , Desbiens A. , Bastien S. , Boudreau S. , Rousseau G. , Blanchet-Létourneau J.
Published: November 2021

A compact light source for the interrogation of a Resonant Fiber-Optic Gyroscope and a laser module for FM-CW LIDAR that produces a linear optical frequency modulation as a function of the electrical drive are presented.
Quantum Sensing Enhanced Fiber Optic Sensors
Authors: Shepard Scott Roger
Published: November 2021

Quantum sensing techniques can greatly enhance imaging but most of these require nonclassical light sources which are inappropriate for use in an optical fiber. One exception which uses low intensity laser light is explored herein.
In vivo functional brain imaging by using a broadband fiber optic photoacoustic probe
Authors: Liu Huan , Liang Yizhi , Jin Long , Wang Lidai , Guan Bai-Ou
Published: November 2021

Oxygen saturation (sO2) imaging can offer useful information for pathological studies and clinical diagnostics. Here we report on a fiber-based photoacoustic microscope for functional brain imaging. The critical element is a fiber-optic ultrasound sensor, which translates the megahertz acoustic waves into detectable lasing frequency variations. Its working bandwidth has been extended to 40 MHz, by reducing the fiber diameter to 58 μm via chemical etching. As a result, in vivo sO2 imaging of a mouse brain can be performed by using a dual-wavelength excitation scheme, taking advantage of the difference in the absorption spectrum between the oxygenated (HbO2) and deoxygenated hemoglobin (HbR). The broadband ultrasound detection can effectively overcome the saturation effect originated from the strong optical absorption. The fiber optic photoacoustic probe paves the way for the implementation of a light-weight, wearable brain imager for awake, freely-moving animals.
Lab-In-Fiber Sensor integrated in Surgical Needle for Fluid Detection
Authors: Roldán-Varona Pablo , Rodríguez-Cobo Luis , López-Higuera José Miguel
Published: November 2021

This paper shows the manufacture of a 300 µm lab-in-fiber sensor integrated in a surgical needle. It includes an air micro-cavity and a Pl-b-Pl FBG, allowing to detect a medium change and the surrounding refractive index.
Distributed acoustic sensing in seismology
Authors: Gonzalez-Herraez Miguel , Fernandez-Ruiz Maria R. , Magalhaes Regina , Costa Luis , Martins Hugo F. , Garcia-Ruiz Andrés , Martin-Lopez Sonia , Williams Ethan , Zhan Zhongwen , Vantilho Roel
Published: November 2021

We review our recent work on chirped-pulse distributed acoustic sensing and its use for the characterization of teleseismic and microseismic activity. We show that this tool may offer impressive new capabilities in the field of seismology, particularly in underwater scenarios.
Real Time Distributed Solar Irradiance sensing: a step closer to smart photovoltaic grids
Authors: Magalhães Regina , Costa Luis , Martin-Lopez Sonia , Gonzalez-Herraez Miguel , Braña Alejandro F. , Martins Hugo F.
Published: November 2021

We propose the first fiber-based distributed sensor able of monitoring absolute solar irradiance in real time, overcoming some of the greatest limitations imposed by the existing remote sensing technologies for dynamic solar energy systems.
Optical scattering field imaging along a nanofiber in operando
Authors: Haddad Yosri , Chrétien Jacques , Margueron Samuel , Beugnot Jean-Charles , Fanjoux Gil
Published: November 2021

An experimental method is presented to characterize spatially and spectrally the Rayleigh scattering field radiated out of a centimetric length and micrometric size photonic waveguide in operando.
The recent developments of the fiber-optic bolometer
Authors: Sheng Qiwen , Liu Guigen , Uddin Nezam , Reinke Matthew L. , Han Ming
Published: November 2021

We summarized the developments of the fiber-optic bolometers including the bolometer fabrication, demodulation and performance with and without radiation. The bolometer showed a noise equivalent power density of 0.27 W/m2 which was comparable with the resistive bolometer.
A Novel Refractive Index Sensing Technique by Interrogating Tilted Fiber Bragg Grating with Electro-optic Dual-comb Interferometer
Authors: Xu Bingxin , Fan Xinyu , Liu Maohuan , He Zuyuan
Published: November 2021

We propose a novel refractive index (RI) sensing technique by interrogating a tilted fiber Bragg grating with electro-optic dual-comb interferometer(EO-DCI). The ex- perimental measurement shows the limit of detection of RI is realized at the order of 10
−
7.
Fiber optic biomarker probe for rapid assessment of myocardial infarction
Authors: Long Junqiu , Xu Zhiyuan , Yin Yi , Hu Deming , Liang Lili , Ran Yang , Guan Bai-Ou
Published: November 2021

We propose a temperature-compensable cardiac biomarker immunosensor using a reflective microfiber Bragg grating. By elevating the reaction temperature to 37 OC (human body characteristics), the detection time could be greatly shortened, enabling the potential of the rapid and in-vivo diagnosis on acute myocardial infarction.
Fiber optic jerk sensor in monitoring earthquake response of high-rise building
Authors: Zhang Wentao , Huang Wenzhu , Zhao Bin , Zhang Jianxiang , Li Zhengbin , Li Li , Li Fang
Published: November 2021

This paper proposed an earthquake response monitoring technique of high-rise buliding using fiber optic jerk sensor. The results show that the fiber optic jerk sensor can monitor the jerk response of different seismic waves.
Dopamine sensing with electrochemically-enhanced ITO-coated lossy-mode resonance optical fiber sensor
Authors: Janik Monika , Janczuk-Richter Marta , Burnat Dariusz , Gabler Tomasz , Niedziółka-Jönsson Joanna , Koba Marcin , Sezemsky Petr , Stranak Vitezslav , Śmietana Mateusz
Published: November 2021

The work reports a lossy-mode resonance optical fiber sensor based on indium tin oxide (ITO) thin films for combined optical and electrochemical dopamine detection through its electropolymerization on the sensor’s surface.
Distributed Humidity Sensor for Moisture-Front monitoring in Soils
Authors: Leandro D. , Bravo M. , Delgado O. , Lopez J. J. , Lopez-Amo M.
Published: November 2021

In this contribution, high spatial resolution distributed humidity sensing was demonstrated for moisture-front monitoring in soils by using polyimide coated optical fiber.
Detection of Sparse Distributions of Nanoscale Gold Spheres on the Surface of an Optical Fiber
Authors: Gang Tingting , Bai Xiaohong , Prezgot Daniel , Liu Fu , Ianoul Anatoli , Albert Jacques
Published: November 2021

Polarized transmission spectra of tilted fiber Bragg gratings (TFBG) are used to detect 10-20 nm-sized gold particles with densities as low as 7 particles/m2 on the fiber surface.
POF Sensor Design Using Milled Annular Cavities
Authors: Inglev Rune , Bang Ole , Janting Jakob
Published: November 2021

We present the design for a POF sensor with two annular cavities milled into the fiber and subsequently filled by a photoluminescent gel. We show that an optimal separation exists for maximum photoluminescent signal.
Non-intrusive Flow Rate Measurements Using FBG Acceleration Sensor
Authors: Jiang Ke , Dai Yutang
Published: November 2021

A customized fiber bragg grating (FBG) acceleration sensor is designed for non-intrusive low flow rate measuring, it has an average sensitivity of 245.2 pm/g. Experimental tests for water system shows the relationship between the standard deviation of vibration data and flow rate is quadratic, the 2 of quadratic curve fitting is 0.990.
Lossy-mode resonance sensors for combined opto- electrochemical biosensing with limited cross-domain interference
Authors: Śmietana Mateusz , Lechowicz Katarzyna , Burnat Dariusz , Sezemsky Petr , Janik Monika , Koba Marcin , Stranak Vitezslav , Bogdanowicz Robert
Published: November 2021

Lossy-mode resonance optical fiber sensors with indium tin oxide (ITO) thin overlay for combined optical and electrochemical label-free biosensing are discussed. Properties of ITO were tuned by the film deposition conditions towards reducing the cross- domain interference.
A fiber-optic sensor based on trimetallic Au@AgPt core- shell nanospheres for ultra-low concentration copper (II) ion detection
Authors: Huang Qing , Yang Minghong , Lewis Elfed
Published: November 2021

This article proposes a novel fiber optic LSPR sensor system based on trimetallic Au@AgPt core-shell nanospheres for the accurate measurement of Cu2+, achieving a good linear response in the range of 10-15 - 10-11 mol/L.
Photonic Approach For Microwave Frequency Measurement Based On Optical Delay Time By Measuring DC Voltage
Authors: Feng Danqi , Zhu Tao , Gao Ya , Gao Lei , Cao Rui
Published: November 2021

We demonstrate a photonic microwave frequency measurement based on optical delay time by measuring DC voltage. The amplitude of DC output is related to the microwave frequency. The measurement range is 2.5-40 GHz and the errors are within 0.1 GHz in 2.5-25 GHz and 0.5 GHz in 25-40 GHz.
Thin film coated D-shaped Fiber regenerable biosensor
Authors: Santano Desiree , Ciaurriz Paula , Tellechea Edurne , Zubiate Pablo , Socorro-Leranoz Abian B. , Villar Ignacio Del , Matias Ignacio R. , Arregui Francisco J.
Published: November 2021

We present a novel covalent functionalization of a D-shape fiber biosensor based on Lossy Mode Resonances. IgG/anti-IgG model is applied to prove the regeneration of the union and thus the re-usability of the sensor.
Plasmonic optical fiber grating biomedical aptasensor
Authors: Lobry Maxime , Loyez Médéric , Hassan Eman M. , Chah Karima , DeRosa Maria C. , Goormaghtigh Erik , Wattiez Ruddy , Caucheteur Christophe
Published: November 2021

A plasmonic optical fiber grating aptasensor was developed for real-time detection of the HER2 breast cancer biomarker. The designed biosensor shows an accurate and selective sensing of HER2 with respect to a biomarker negative control.
SHM at Giant Mine Heaps by OTDR Sensing with Polymer Optical Fibers: Chances and Challenges from Field Campaigns
Authors: Engelbrecht R. , Dengler S. , Luber M. , Fischer J. , Hangen H.
Published: November 2021

Results from field measurement campaigns for structural health monitoring (SHM) at giant mine heaps by optical time domain reflectometry (OTDR) in polymer optical fibers (POF) are presented. Polymer geogrids built for soil reinforcement are fitted with POF for strain sensing as part of a geosynthetic sealing system designed to protect the heap from infiltration of surface water. Strain is detected by a local increase of backscatter. Measurements on eight sensor lines have been performed over a time period of six months to monitor the system behavior and potential development of or cracks within the underlying base of a sealing system. Results show the usability of this technology for strain sensing and SHM in such a harsh environment. Challenges still exist in the quantitative evaluation of the fiber sensor data due to cross sensitivity to fiber bending and lateral pressure.
Highly Sensitive Bi-conically Tapered Fiber Sensor with Wavelength-dependent Sensitivity
Authors: Salik Ertan , Sanchez Martin , Herrera Victor , Pala Ragip
Published: November 2021

We studied the dependence of sensitivity of a biconically tapered optical fiber sensor on the wavelength of light used, and experimentally demonstrated refractive index sensitivity of about 11000 nm/RIU at nearly 1570 nm. Based on our theoretical analysis, we predict that tapered fiber refractive index sensors with sensitivities exceeding 50000 nm/RIU can be developed. We attribute the enhanced sensitivity mainly to the nonlinear variation of the difference in mode propagation constants with wavelength. Such ultrahigh sensitivity combined with low cost and simplicity for tapered fiber refractive index sensors makes them good candidates for numerous sensing applications in medical diagnosis, food safety, environmental monitoring, and biodefense. © 2020 The Author(s)
Position Measurement of Multiple Microparticles in Hollow- Core Photonic Crystal Fiber by Coherent Optical Frequency Domain Reflectometry
Authors: Podschus Jasper , Koeppel Max , Schmauss Bernhard , Sharma Abhinav , Sundaramahalingam Sanju , Xie Shangran , Russell Philip St.J.
Published: November 2021

Flying particle sensors in hollow-core photonic crystal fibers require accurate localization of the optically trapped microparticles. We report position measurement to micrometer- resolution, using optical frequency domain reflectometry, of two 1.65-µm-diameter polystyrene particles.
Opto-mechanical cross-talk reduction in air-holes multicore fibers
Authors: Zaslawski Simon , Fu Yun , Yang Zhisheng , Markiewicz Krzysztof , Szostkiewicz Lukasz , Nasiłowski Tomasz , Thévenaz Luc
Published: November 2021

We report on the use of air-holes in multicore fibers to alleviate intercore perturbations induced by forward stimulated Brillouin scattering. Comparisons with conventional multicore fibers show significant improvement in terms of cross-talk reduction.
Particle size measurement based on a single fiber tweezer
Authors: Liu Zhihai , Wang Lu , Zhang Yu , Zhang Yaxun , Tang Xiaoyun , Sha Chunyu
Published: November 2021

We achieve the particle size measurement based on a fiber-tweezer-based dual-beam interference approach. We may obtain the particle size information from the FSR of the interference spectrum. Our method is non-contact, real-time and label-free.
Distributed Fiber Optic Sensing for Aircraft Towards In- Flight Structural Control
Authors: Wada Daichi , Igawa Hirotaka
Published: November 2021

We show a distributed fiber optic sensing technique for in-flight aircraft monitoring. Based on distributed fiber optic sensing data, load identification and adaptive wing control techniques are shown.
Self-Referencing Fiber Bragg Grating Sensor for Structural Damage Detection
Authors: Wee Junghyun , Alexander Kevin , Peters Kara
Published: November 2021

We demonstrate a self-referencing FBG sensor for damage detection. The sensor compensates for changing environmental conditions by measuring the reference and distorted signal simultaneously and uses traveling acoustic waves in optical fibers.
Machine Learning Assisted FBG-based Current Sensor for Transmission Lines
Authors: Sarkar Sanjib , Tarhani Mehdi , Banerjee Mandrita , Eghbal Morad Khosravi , Shadaram Mehdi
Published: November 2021

We demonstrate the ability of machine learning methods to predict simultaneously the current and the temperature of the magnetostrictive-fiber Bragg grating (FBG) based current sensor, which will reduce its cost and complexity.
Fabrication and Sensing Characteristics of Long-Period Gratings in a Polarization-Maintaining Fiber by CO2-Laser Processing Machine
Authors: Jiang Chen , Liu Yunqi , Guo Kai , Mou Chengbo
Published: November 2021

We propose the fabrication long-period gratings in a polarization-maintaining fiber using commercial CO2-laser glass-processing machine that allows for tapering the fiber during laser heating process. The sensing characteristics of the gratings were investigated experimentally.
Investigation Influence of Conformal Coating Application Process on the Reset Signal Assessment
Authors: Dönertaş Seval , Gökkavas Mutlu , Orhan Elif , Özbay Ekmel
Published: November 2021

It is investigated how different conformal coating materials affect the electrical strength of MIOC. It is understood that the choice of appropriate conformal coating material is important issue with regards to operation reliability of MIOC.
Highly Sensitive Optical Fiber Ultrasonic Sensor for Partial Discharge Detection
Authors: Wang Meiling , Liu Tao , Wu Yu , Rao Yunjiang
Published: November 2021

Optical fiber ultrasonic sensor based on Fabry-Perot cavity and micro-electromechanical-system diaphragm was proven to be suitable for partial discharge detection, which shows frequency responses up to 500kHz and minimum detectable pressure as low as 0.455μPaHz−1/2.
Simultaneous inscription of an antisymmetric long-period grating and an apodized fiber Bragg grating on a dual-core As2Se3-PMMA tapered fiber and its strain measurement
Authors: Gao Song , Baker Chams , Chen Liang , Bao Xiaoyi
Published: November 2021

We proposed a method to simultaneously inscribe an antisymmetric long-period grating and an apodized fiber Bragg grating on a tapered dual-core As2Se3-PMMA fiber and based on this new device a strain measurement is demonstrated.
Characterization of Femtosecond Laser Direct Written Mach-Zehnder Interferometers Based on Titanium Dioxide Coated Long Period Fiber Gratings
Authors: Viveiros Duarte , Vasconcelos Helena , de Almeida José M. M. M. , Coelho L. , Amorim Vítor A. , Maia João M. , Jorge Pedro A. S. , Marques P. V. S.
Published: November 2021

Optical fiber Mach-Zehnder interferometers were fabricated by combining two TiO2 coated LPFGs fabricated through femtosecond laser direct writing. Results of its refractometric characterization are presented and compared with the single LPFGs sensors. Wavelength sensitivity of 1175 nm/RIU at 1.38 and spectral resolution of 2.2x10-5 were achieved.
High-sensitivity Optical Fiber F-P Ultrasound Hydrophone Based on Chitosan Film
Authors: Liu Jian , Li Cheng , Hao Shaohua , Zhong Chao
Published: November 2021

This study proposes an F-P chitosan thin-film fiber optic hydrophone for detecting underwater ultrasound. Due to the high surface finish and molecular permeability of the film, the sensor has high sensitivity and operating point stability.
Highly birefringent photonic crystal fiber for distributed hydrostatic pressure sensing
Authors: Mikhailov Sergei , Geernaert Thomas , Berghmans Francis
Published: November 2021

We demonstrate a highly birefringent photonic crystal fiber design dedicated to distributed hydrostatic pressure sensing. The polarimetric pressure sensitivity of the proposed fiber is −32.1 rad∙MPa−1∙m−1 at 1.55 μm in combination with very low temperature sensitivity.
Combined tension-compression mε sensor with 1 ε μ resolution based on 6 non-uniform-core-offset fiber
Authors: Fan Huibo , Chen Liang , Bao Xiaoyi
Published: November 2021

We demonstrate the combined tension-compression strain sensors from 1 micro to 20 milli-strain with 1 εμ resolution based on the 6 non-uniform-core-offset fibers which are fabricated by core-offset splicing of multiple single-mode fiber segments.
Application of higher-order cladding modes of long period fiber gratings for refractive index sensing with high sensitivity and unfamiliar modal properties
Authors: Bandyopadhyay Sankhyabrata , Shao Liyang , Jiang Jiahao , Hu Jie , Liu Shuaiqi , Liu Yibing , Shum Perry Ping , Wang Chao , Smietana Mateusz
Published: November 2021

In this paper, we have studied the performance of higher-order cladding modes of long-period fiber gratings (LPFG) in volume and surface-based applications. Distinct properties of higher-order cladding modes are being observed during the transition of modes.
Roll-to-Roll Femtosecond Laser Inscription of In-fiber Rayleigh Scattering Centers for Improved Distributed Temperature Sensing Performance
Authors: Wang Mohan , Huang Sheng , Zhao Kehao , Wu Jingyu , Buric Michael , Ohodnicki Paul R. , Lu Ping , Liu Bo , Chen Kevin P.
Published: November 2021

Femtosecond laser direct writing was used to continuously induce Rayleigh scattering centers in meters of single-mode optical fiber using a customized roll-to-roll setup, which can be used to improve the performance of scattering-based distributed sensing.
A Microfiber Probe-Based Wearable Sensor for Human Healthcare Monitoring
Authors: Tan Shijie , Li Yanpeng , Fang Fang , Li Liangye , Yan Zhijun , Liu Deming , Sun Qizhen
Published: November 2021

A microfiber probe-based wearable sensor is proposed and demonstrated. Based on the flexibility and high sensitivity of microfiber, the sensor can measure the joint motion and the pulse wave for health monitoring.
Multipoint Vibration Measurement Using Fabry-Perot Interferometers Consisting of Low-reflective Fiber Bragg Gratings Interrogated by Current Modulated Laser Diode
Authors: Nakaya Koki , Hung Bui Quoc , Fukushima Koken , Soares Manuel Guterres , Wada Atsushi , Tanaka Satoshi
Published: November 2021

We present a multipoint vibration sensing system using fiber Fabry-Perot interferometers consisting of low-reflective fiber Bragg gratings (FBG-FPI) and a current-modulated laser diode. The lasing wavelength of a laser diode can be modulated by changing the injection current. Therefore, high-speed current modulation makes possible to achieve high-speed wavelength sweep exceeding 100 kHz. Using a current modulated laser diode as the source for interrogation of FBG-FPI sensor array, high-speed multipoint vibration measurement can be realized.
Wave visualization of ultrasonic guided waves in a metallic structure using fiber Bragg gratings
Authors: Jagadeeshwar Tabjula L , K Srijith , Rajagopal Prabhu , Srinivasan Balaji
Published: November 2021

We experimentally demonstrate the visualization of ultrasonic wave propagation in a metallic plate using a surface-bonded fiber Bragg grating sensor and non-contact excitation of the desired guided mode.
Acousto-optic Modulator Based Magnetic Field Sensor Using π-Phase Shifted Fiber Bragg Grating
Authors: Yaras Yusuf Samet , Degertekin F. Levent
Published: November 2021

A fiber optic magnetic field sensor utilizing an FBG based acousto-optic modulator is introduced. Sensitivity of 1.84mV/nT with minimum detectable magnetic field strength of 6.1pT/√Hz and dynamic range of 117dB/√Hz are demonstrated at 23MHz.
Laser Doppler vibrometry measurements of acoustic modes in optical fibers
Authors: Wee Junghyun , Kim Jee Myung , Marashi Cameron , Peters Kara
Published: November 2021

We measure the mode conversion of symmetric and anti-symmetric Lamb waves in a plate to longitudinal and flexural modes in an optical fiber, through an adhesive bond, using a high resolution 3D laser Doppler vibrometer.
Fiber Bragg Grating Thermometry Applied to Flow Measurements – Laminar and Turbulent Regimes
Authors: Patyk Rodolfo Luiz , Grabarski Leandro , Kalinowski Hypolito José
Published: November 2021

Fiber Bragg gratings are used to measure the flow in pipelines by means of the temperature evolution, at two different measurement points, after transit of a thermal slug. Results analyze both laminar of turbulent flow regimes.
Curvature Sensing Using a Novel Hybrid Polycarbonate-Silica Multicore Fiber
Authors: Boilard Tommy , Morency Steeve , Messaddeq Younès , Fortier Richard , Trépanier François , Bernier Martin
Published: November 2021

A 55 m-long hybrid polycarbonate-silica multicore fiber was drawn from a microstructured polycarbonate preform, assembling together three polyimide-coated fibers containing a fiber Bragg grating. Its sensitivity to bending is in good agreement with theory.
Self-Compensated Omnidirectional Tilt Sensor Using Multi-Core Fiber Inscribed with Bragg Gratings
Authors: Cui Jingxian , Gunawardena Dinusha Serandi , Liu Zhengyong , Tam Hwa-Yaw
Published: November 2021

An omnidirectional inclinometer based on Bragg gratings inscribed in seven-core fiber is proposed. It measures azimuthal and inclination angles, simultaneously with maximum accuracies of 0.0001° and 0.025° in the range of 0-360° and 0-90°, respectively.
Heterogeneous double period array multicore fiber-based Bragg grating
Authors: Ye Peng , Li Ping , Tian Peixuan , Guan Chunying , Shi Jinhui , Yuan Libo
Published: November 2021

Fiber Bragg gratings (FBGs) are successfully inscribed in the heterogeneous double period array multicore fiber (DPAMCF), in which the spacing between two adjacent cores is approximately equal and the core sizes change periodically. The responses of each grating to the axial strain and temperature are measured.
Reducing Microbending Losses in Glass Fiber-Packaged Fiber Bragg Grating Sensors for Wind Blades Monitoring
Authors: Zhu Pingyu , Liu Pan , Wu Jiang , Wang Zun , Wang Shuaibin , Liu Shun , Soto Marcelo A.
Published: November 2021

Microbending losses induced while packaging fiber Bragg grating sensors into glass-fiber composites are investigated. Their impact on the response of a series of packaged sensors is studied in a real-scale 71.5 m-long wind turbine blade.
Hybrid sensor based on a fiber Bragg grating and cascaded Fabry-Perot interferometers inscribed by a femtosecond laser
Authors: Paixão Tiago , Araújo Francisco , Antunes Paulo
Published: November 2021

We report on a dual-parameter discriminative sensor based on a Bragg grating and two Fabry-Perot interferometers inscribed in an optical fiber by a femtosecond laser. Using Vernier effect, sensitivities of 113pm/µε and 1135pm/°C were achieved.
FBG Optical Load Cell Immune to Temperature Variation for Overhead Transmission Lines Ampacity Monitoring
Authors: Peres Rodrigo , Rosolem Joao Batista , de Araujo Artur , de Avila Luis Fernando
Published: November 2021

In this work an optical load cell for overhead transmission lines ampacity monitoring. It was designed using the combination of two materials with different coefficients of linear thermal expansion to reduce the temperature influence.
Cyclo Olefin Polymer Fiber for FBG Based Sensors
Authors: Woyessa Getinet , Rasmussen Henrik Koblitz , Bang Ole
Published: November 2021

We demonstrated single mode step index polymer optical fiber fabricated from Cyclo Olefin Polymer. The fiber core and cladding composed of Zeonex grade E48R and 480R, respectively. The fabrication method was rod-in-tube and heat draw.
A bending / stretching interferometric sensor based on lateral-offset spliced seven-core fiber
Authors: Zhou Rui , Wang Ruohui , Chen Fengyi , Ma Wenwen , Qiao Xueguang
Published: November 2021

A bending / stretching fiber-optic strain sensor based on a seven-core fiber exhibited significantly measurement resolution, the optimal curvature sensitivity of the sensor is achieved 25.96 nm/m-1, and the tensile strain is 0.094 nm/µε.
Side-polished multimode interferometer for the vector magnetic field sensing
Authors: Chen Yaofei , Hu Yuchan , Cheng Hongda , Yan Feng , Lin Qianyu , Chen Lei , Liu Guishi , Luo Yunhan , Chen Zhe
Published: November 2021

A vector magnetometer, based on a side-polished single-mode-multimode-single-mode fiber structure integrated with ferrofluids, is proposed and investigate. The sensing performance depending on the residual thickness of the side-polished fiber is well investigated experimentally. Comments and questions should be directed to the OSA Conference Papers staff.
Evaluation of the potential of Fiber Optic Sensors for Structural Health Monitoring of Carbon Fiber-Reinforced Concrete Composites
Authors: Alwis L.S.M , Bremer K. , Weigand F. , Kuhne M. , Helbig R. , Roth B.
Published: November 2021

The paper presents an evaluation on the structural and operational potential of fiber optic sensors (FOSs) to be utilized for real-time continuous structural health monitoring (SHM) of fiber-reinforced carbon concrete composites (C3).
A new procedure for tunnel convergence monitoring using Optical Multicore Fiber Shape Sensor
Authors: Floris Ignazio , Sun Qianchen , Xu Xiaomin , Houghton Neil , Kechavarzi Cedric , Madrigal Javier , Sartiano Demetrio , Sales Salvador , Elshafie Mohammed , Calderón Pedro A. , Adam Jose M.
Published: November 2021

This paper describes an innovative approach to track the deformation of
tunnel cross-section using Optical Multicore Fiber Shape Sensor based
on multiplexed Fiber Bragg Grating strain sensors.
Sensitive Optical Fiber Sensors Based on Phase-Shifted Supermode Interferometers
Authors: Villatoro Joel , Antonio-López Enrique , Schülzgen Axel , Amezcua-Correa Rodrigo
Published: November 2021

The use of two phase shifted supermode interferometers is proposed for precision optical fiber sensing. The advantage of such interferometers for sensing include sensitivity enhancement, easy implementation, simple interrogation, and compactness. Some sensors are demonstrated.
Enzymatic Detection of Uric Acid by Optofluidic Biolaser
Authors: Wang Yanqiong , Yang Xi , Mao Jiangui , Wang Zinan , Wu Yu , Gong Yuan , Rao Yun-Jiang
Published: November 2021

An optofluidic biolaser is developed for uric acid detection by incorporating a Fabry-Perot cavity and a coupled enzyme reaction. An optimal DC bias of reactant is pre-added to enhance the sensing performance.
Compact Optical Fiber Lasers and Optical Fiber Sensors assisted by Femtosecond Laser Inscription of Plane-by-Plane FBGs
Authors: Roldán-Varona P. , Pallarés-Aldeiturriaga D. , Rodríguez-Cobo L. , Pérez-Herrera R. A. , Bravo M. , López-Amo M. , López-Higuera J. M.
Published: November 2021

Development of a high temperature sensor based on optical fiber l aser generated from a cavity of reduced dimensions (43 mm) in Er-doped fiber. The mirror FBGs have been inscribed with femtosecond laser using the slit beam technique (Pl-b-Pl).
Miniature Fabry-Perot Interferometer based on Four-Core Sapphire-Derived Fiber for High Temperature Sensing
Authors: Wang Zhifeng , Liu Huanhuan , Ma Zhangwei , Chen Zhenyi , Chen Na , Wang Tingyun , Pang Fufei
Published: November 2021

A Fabry-Perot interferometer based on a four-core sapphire-derived fiber for high temperature sensing has been proposed. Such a FPI can work linearly from room temperature to 1000 °C. The temperature sensitivity is about 15 pm/°C.
Ultra-sensitive Temperature Sensor Based on an Isopropanol-sealed Mach-Zehnder Interferometer
Authors: Lin Hongfeng , Xu Yanyan , Zhou Ai , Dai Yutang
Published: November 2021

We present and demonstrate an ultra-sensitive temperature sensor based on an isopropanol-sealed Mach-Zehnder Interferometer (MZI). The structure is composed of a refractive index sensitive MZI that encapsulated in a capillary tube filled with isopropanol. The isopropanol with a high thermo-optic coefficient, which directly constitutes the sensing arm of the encapsulated MZI. When the temperature changes, the optical path difference between the two MZI’s interference arms changed greatly due to the drastic change in the refractive index of isopropanol, leading to wavelength shift significantly. Experimental results show an ultra-high sensitivity of 7.3819 nm/°C with good linearity. In addition, the temperature sensor is insensitive to the surrounding refractive index change. Excellent performance demonstrates it a good candidate for temperature measurement.
Detection of Moving Targets using Coherent Optical Frequency Domain Reflectometry
Authors: Renner Esther , Koeppel Max , Schmauss Bernhard
Published: November 2021

We present Doppler-corrected position and velocity measurement with a fiber-coupled COFDR system based on the FMCW radar principle for high precision localization applications. A high measurement accuracy and the ability to track targets are demonstrated.
Development of a digital twin of the sensing coil of fiber-optic gyroscope under homogeneous thermal field compared with Rayleigh-OFDR measurements
Authors: Pillon J. , Boiron H. , Louf F. , Peter E. , Marin E. , Morana A. , Boucard P.-A. , Collignon M. , Rattier M. , Girard S. , Lefêvre H.C.
Published: November 2021

We propose a digital axisymmetric thermomechanical model of the sensing coil of fiber-optic gyroscope to compute the strain along the fiber. Validity and limitations of this model are evaluated using Rayleigh-OFDR measurements. © 2021 The Author(s)
Refractive index of liquids measured by fiber specklegram contrast
Authors: Lomer M. , Rodriguez-Cobo L. , Laarosi I. , Lopez-Higuera J. M.
Published: November 2021

A method of measuring the refractive index of liquid based on the change of speckle contrast in fiber is presented. The correlation of propagation losses, proportional to the speckle contrast, is used when a section of U-shaped fiber without cladding is submerged in the liquid. The proposed method is easy to perform, simple and low cost, allows quick measurements, with good accuracy and in a large dynamic range.
Combining FBG and thin-core interferometers to analyse phase-transitions in binary fluids
Authors: Wahl Markus Solberg , Wilhelmsen Øivind , Hjelme Dag Roar
Published: November 2021

We demonstrate monitoring of phase-transitions in binary liquid mixtures by combining a fiber Bragg grating and a thin-core fiber interferometer. Temperature and refractive index sensing enable direct measurements of concentration changes below the melting point.
Tilted Long-Period Fiber Grating based on Eccentric Core fiber
Authors: Zhao Yujia , Xu Xiaofeng , Zhou Ai
Published: November 2021

We present and demonstrate a tilted long period fiber gratings (TLPFGs) which were inscribed in an eccentric core fiber (ECF) by a high frequency CO2 laser. The coupling characteristics of ECF-TLPFG were analyzed using coupling mode theory. The curvature and temperature characteristics of the ECF-TLPFG were measured by monitoring the wavelength change of spectrum. The spectral response of ECF-TLPFG to curvature in different bending directions was studied experimentally. Experimental results show that the bending sensitivity of the sensor in the 0 °and 180 °bending directions are -8.81 nm/m-1 and -3.79 nm/m-1, respectively. The temperature sensitivity of the ECF-TLPFG is 57.5pm/°C.
Distributed high temperature measurement of an optical fiber subjected to electric arc discharges
Authors: Chen Chen , Gao Song , Krarup Ole , Bao Xiaoyi
Published: November 2021

A distributed high temperature measurement of an optical fiber subjected to electric arc discharges based on optical frequency-domain reflectometry is experimentally demonstrated. The distributed temperature profile is obtained at different electric currents with maximum detectable temperature up to 2300K in an open thermal equilibrium system.
Simultaneous Measurement of Gas Pressure and Temperature Based on MZI Cascaded with FBG
Authors: Li Jun , Lin Hongfeng , Zhou Ai
Published: November 2021

An optical fiber sensor based on Mach-Zehnder interferometer (MZI) cascaded with a fiber Bragg grating (FBG) for simultaneous measurement of temperature and gas pressure is proposed and demonstrated. The MZI is fabricated by inserting a piece of tapered SMF in between two sections of MMF, which performs as the gas pressure sensing element. A FBG is cascaded with the MZI to eliminate the temperature induced wavelength shift of the MZI due to the thermal optic and thermal expansion effect of silica. Experimental results show that the MZI with gas pressure and temperature responses of -8.82 nm/MPa and 33.1 pm/℃ respectively. The FBG exhibits a temperature response of 12.3 pm/℃ and shows insensitive to gas pressure. By tracing the transmission dips of the MZI and FBG simultaneously, gas pressure and temperature variation can be monitored at the same time.
Long range and distributed interferometric vibration sensor using multicore fiber
Authors: Shen Li , Zhao Zhiyong , Dang Yunli , Gan Lin , Tang Ming , Lu Chao
Published: November 2021

we propose and experimentally demonstrate a novel long range distributed vibration sensor by using two counter-propagating interferometers in different cores of a seven-core fiber with 38.5 km sensing range, which is able to get rid of the detrimental impact of Rayleigh backscattered light by using only one laser.
Raman Distributed Temperature Sensor Based on Intensity-modulated Pulse Compression Technique
Authors: Zhou Bocheng , Fan Xinyu , He Zuyuan
Published: November 2021

We proposed a novel Raman distributed temperature sensor (RDTS) based on intensity-modulated pulse compression technique. The spatial resolution and temperature resolution are 1.6 m and 1.8 °C at a range of 24 km.
Acousto-optic self-heterodyne comb readout for strain sensing with random fiber grating
Authors: Poiana Dragos Andrei , Souto José Antonio García , Bao Xiaoyi
Published: November 2021

In this work we propose a demodulation and readout scheme for random fiber grating with acousto-optic self-heterodyne comb. The system reads amplitude modulation encoded strain perturbations of random fiber grating.
Plasmonic tapered-fiber interference sensor for simultaneously detecting refractive index and temperature
Authors: Chen Xinghong , Li Xuejin , Yi Duo , Hong Xueming , Chen Yuzhi
Published: November 2021

A single-optic-fiber sensor is proposed to simultaneously detect the refractive index (RI) and temperature (T) at a single wavelength band. This sensor is based on the mixed effects of Mach–Zehnder interference (MZI) and surface plasmon resonance (SPR), where MZI is excited by a tapered-fiber structure, and SPR is stimulated by a 45 nm gold film on the tapered-fiber surface. The detection signal of an SPR spectrum superimposed on interference stripes was obtained. After fast Fourier transform and filter processing, the MZI and SPR signals were separated. Experimental results indicate that our sensor can improve the RI sensitivity to 2021.07 nm/RIU (21-fold greater than that of the original tapered-fiber MZI sensor) and detect T simultaneously. Additionally, this highly integrated sensor simplifies the detection system, with potential applications in portable biochemical sensing.