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optical fiber sensors

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激光 1980年第Z1期 117-117页

作者： Shin-chun LinNavel Research Laboratory

The materials of the modern optical fibers have been found to exhibit photoelastic,electo-optic and magneto-optic properties when subjected to external disturbances causedby mechanical stresses, temperature variations, electromagnetic fields. As a consequence,the propagation constants of the optical modes in fibers are changed. While these changesmay not be desirable for optical communications, they can be exploited for the measure-ments of the external disturbances. With the development of very low-loss fibers (αfibers. In fact, many ideas of using optical fibers as sensors have appeared in the litera-ture. For example, optical fiber interferometers for acoustic pressure sensoring have been

关键词： optical fiber sensors

Research on fiber Optic Surface Plasmon R ***:A Review

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Photonic sensors 2024年第2期14卷 1-30页

作者： Qi WANG Dianyun ZHANG Yizhuo QIAN Xiangyu YIN Lei WANG Shushuai ZHANG Yuyang WANG State Key Laboratory of Synthetical Automation for Process Industries Northeastern UniversityShenyang 110819China College of Information Science and Engineering Northeastern UniversiyShenyang 110819China Hebei Key Laboratory of Micro-Nano Precision optical Sensing and Measurement Technology Qinhuangdao 066004China State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan UniversityChangsha 410082China

Due to the benefits of the high sensitivity,real-time response,no labeling requirement,and good selectivity,fiber optic sensors based on surface plasmon resonance(SPR)have gained popularity in biochemical sensing in recent *** current research on such sensors is hot in enhancing sensitivity,improving detection accuracy,and achieving the detection of biochemical *** goal of this work is to present a thorough overview of recent developments in the optical fiber SPR biosensor ***,it explores the basic principles and sensing structures of optical fiber SPR biosensors,focusing on four ***,this paper introduces three fiber optic surface plasmon biosensors:SPR,localized surface plasmon resonance(LSPR),and long-range surface plasmon resonance(LRSPR).Each concept is explained from the perspective of the basic principles of fiber optic SPR ***,a classification of fiber optic SPR biosensors in health monitoring,food safety,environmental monitoring,marine detection,and other applications is introduced and ***,this paper summarizes the current research directions of SPR ***,it provides a prospective outlook on how fiber optic SPR sensors will develop in the future.

关键词： Surface plasmon resonance biosensors optical fiber sensors sensitivity

Review of femtosecond laser fabricated optical fiber high temperature sensors [Invited]

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Chinese Optics Letters 2021年第9期19卷 23-28页

作者： Dong-Ning Wang College of optical and Electronic Technology China Jiliang UniversityHangzhou 310018China

The femtosecond laser has been an efficient tool for optical fiber high temperature sensor ***,we review the progress of optical fiber high temperature sensors based on femtosecond laser fabricated fiber gratings and ... 详细信息

关键词： optical fiber sensors femtosecond laser micromachining high temperature measurement

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Recent advances in optical fiber high-temperature sensors and encapsulation technique[Invited]

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Chinese Optics Letters 2023年第9期21卷 47-69页

作者：徐文杰卞强梁建桥王振丞于洋孟洲 Center of Material Science National University of Defense TechnologyChangsha 410073China Photonics Laboratory Munich University of Applied SciencesMunich 80335Germany Institute for Measurement and Sensor Technology Technical University of MunichMunich 80333Germany College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

In the aerospace field,for aerospace engines and other high-end manufacturing equipment working in extreme environments,like ultrahigh temperatures,high pressure,and high-speed airflow,in situ temperature measurement is of great importance for improving the structure design and achieving the health monitoring and the fault diagnosis of critical *** fiber sensors have the advantages of small size,easy design,corrosion resistance,anti-electromagnetic interference,and the ability to achieve distributed or quasi-distributed sensing and have broad application prospects for temperature sensing in extreme *** this review,first,we introduce the current research status of fiber Bragg grating-type and Fabry–Perot interferometer-type high-temperature *** we review the optical fiber hightemperature sensor encapsulation techniques,including tubular encapsulation,substrate encapsulation,and metalembedded encapsulation,and discuss the extreme environmental adaptability of different encapsulation ***,the critical technological issues that need to be solved for the application of optical fiber sensors in extreme environments are discussed.

关键词： optical fiber sensors high-temperature sensing encapsulation technique extreme environments

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Sensitivity-Enhanced Hot-Wire Anemometer by Using Cladding-Etched fiber Bragg Grating

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Photonic sensors 2023年第3期13卷 1-7页

作者： Yuhan TANG Xuke CHEN Jiarui ZHANG Dajuan LV Liangming XIONG Xinyong DONG School of Physics and Optoelectronic Engineering Guangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangzhou 510006China Institute of Optoelectronic Technology China Jiliang UniversityHangzhou 310018China School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China State Key Laboratory of optical fiber and Cable Manufacture Technology Wuhan 430073China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China

A sensitivity-enhanced hot-wire anemometer based on a cladding-etched optical fiber Bragg grating(FBG)coated with a layer of silver film and optically heated by using a 1480nm laser diode is *** silver film absorbs the laser power to heat the FBG to a certain high temperature and the airflow cools down the FBG hot-wire with the cooling effect and hence the Bragg wavelength of the FBG is determined by the airflow *** measurement results show that the heating efficiency of the FBG hot wire is improved by 3.8times in magnitude by etching the fiber cladding from 125μm down to 73.4μm,and the achieved airflow velocity sensitivities,under a laser power of 200mW,are–3180pm/(m/s),–889pm/(m/s),–268pm/(m/s),and–8.7pm/(m/s)at different airflow velocities of 0.1m/s,0.5m/s,1.5m/s,and 17m/s,*** comparison,the sensitivities are only–2193 pm/(m/s),–567 pm/(m/s),–161 pm/(m/s),and–4.9pm/(m/s)for the reference anemometer without cladding etching even at a much higher heating laser power of *** results prove that the method by using a cladding-etched FBG to improve sensitivity of FBG-based hot-wire anemometers works and the sensitivity is improved significantly.

关键词： fiber Bragg grating hot-wire anemometer optical fiber sensors

Advances in phase-sensitive optical time-domain reflectometry

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Opto-Electronic Advances 2022年第3期5卷 25-52,I0001页

作者： Shuaiqi Liu Feihong Yu Rui Hong Weijie Xu Liyang Shao Feng Wang Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518000China Key Laboratory of Intelligent optical Sensing and Manipulation Ministry of EducationNanjing UniversityNanjing 210023China

Phase-sensitive optical time-domain reflectometry(Φ-OTDR)has attracted numerous attention due to its superior performance in detecting the weak perturbations along the *** on the ultra-sensitivity of light phase to the tiny deformation of optical fiber,Φ-OTDR has been treated as a powerful technique with a wide range of *** is fundamental to extract the phase of scattering light wave accurately and the methods include coherent detection,I/Q demodulation,3 by 3 coupler,dual probe pulses,and so ***,researchers have also made great efforts to improve the performance ofΦ-*** frequency response range,the measurement accuracy,the sensing distance,the spatial resolution,and the accuracy of event discrimination,all have been enhanced by various ***,lots of researches on the applications in various kinds of fields have been carried out,where certain modifications and techniques have been ***,Φ-OTDR remains as a booming technique in both researches and applications.

关键词： optical fiber sensors Ф-OTDR phase demodulation application research

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Advanced fiber-Optic Acoustic sensors

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Photonic sensors 2014年第3期4卷 198-208页

作者： Joao G. V. TEIXEIRA Ivo T. LEITE Susana SILVA Orlando FRAZAO EQS Group Rua Joaquim Dias Rocha 354 4470-221 Maia Portugal lNESC TEC (coordinated by INESC Porto) Rua Campo Alegre 687 4169-007 Porto Portugal Department of Physics and Astronomy Faculty of Sciences- University of Porto Rua Campo Alegre 687 4169-007 Porto Portugal

Acoustic sensing is nowadays a very demanding field which plays an important role in modern society, with applications spanning from structural health monitoring to medical imaging. fiber-optics can bring many advantages to this field, and fiber-optic acoustic sensors show already performance levels capable of competing with the standard sensors based on piezoelectric transducers. This review presents the recent advances in the field of fiber-optic dynamic strain sensing, particularly for acoustic detection. Three dominant technologies are identified - fiber Bragg gratings, interferometric Mach-Zehnder, and Fabry-Perot configurations - and their recent developments are summarized.

关键词： Acoustic sensors fiber optics optical fiber sensors

fiber Optic Hydrogen sensors： a Review

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Photonic sensors 2014年第4期4卷 300-324页

作者： Minghong YANG Jixiang DAI National Engineering Laboratory for optical fiber Sensing Technologies Wuhan University of Technology Wuhan430070 China

Hydrogen is one of the next generation energies in the future, which shows promising applications in aerospace and chemical industries. Hydrogen leakage monitoring is very dangerous and important because of its low ignition energy, high combustion efficiency, and smallest molecule. This paper reviews the state-of-art development of the fiber optic hydrogen sensing technology. The main developing trends of fiber optic hydrogen sensors are based on two kinds of hydrogen sensitive materials, i.e. palladium-alloy thin films and Pt-doped WO3 coatings. In this review work, the advantages and disadvantages of these two kinds of sensing technologies will be evaluated.

关键词： optical fiber sensors hydrogen sensing thin films coatings

fiber Cavity Ring-Down Using an optical Time-Domain Reflectometer

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Photonic sensors 2014年第4期4卷 295-299页

作者： D. J. PASSOS S. O. SILVA J. R. A. FERNANDES M. B. MARQUES O. FRAZAO INESC Porto Rua do Campo Alegre 687 4169-007 Porto Portugal and Dept. de Fisica e Astronomia da Faculdade deCiOncias da Universidade do Porto Rua do Campo Alegre 687 4169-007 Porto Portugal Departamento de Fisica Escola de Ci~ncias e Tecnologia Universidade de Tr6s-os-Montes e Alto Douro Quinta dePrados 5001-801 Vila Real Portugal

This work presented a demonstration of the potential for a fiber based cavity ring-down （CRD） using an optical time-domain reflectometer （OTDR）. The OTDR was used to send the impulses down into about 20km of a standard single optical fiber, at the end of which the fiber cavity ring-down was placed. The OTDR measured no appreciable losses, so other CRDs multiplexed could be spliced in parallel along the same optical fiber. To demonstrate the behavior and sensitivity of the proposed configuration, a displacement sensor based on a fiber taper with a diameter of 50 μm was placed inside the fiber loop, and the induced losses were measured on the CRD signal -- a sensitivity of 11.8 ＋ 0.5 μs/mm was achieved. The dynamic range of the sensing head used in this configuration was about 2 mm. Finally, this work was also compared with different works published in the literature.

关键词： optical fiber sensors cavity ring-down OTDR