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Chinese Physics B 2018年第9期27卷 128-136页

作者： Zhi-Hua Shao Xue-Guang Qiao Feng-Yi Chen and Qiang-Zhou Rongt School of Physics Northwest UniversityXi an 710069China

An ultrasonic sensitivity-improved fiber-optic fabry-perot interferometer （FPI） is proposed and employed for ultra- sonic imaging of seismic physical models （SPMs）. The FPI comprises a flexible ultra-thin gold film and the end face of a graded-index multimode fiber （MMF）, both of which are enclosed in a ceramic tube. The MMF in a specified length can collimate the diverged light beam and compensate for the light loss inside the air cavity, leading to an increased spectral fringe visibility and thus a steeper spectral slope. By using the spectral sideband filtering technique, the collimated FP1 shows an improved ultrasonic response. Moreover, two-dimensional images of two SPMs are achieved in air by recon- structing the pulse-echo signals through using the time-of-flight approach. The proposed sensor with easy fabrication and compact size can be a good candidate for high-sensitivity and high-precision nondestructive testing of SPMs.

关键词： fiber-optic sensor fabry-perot interferometer seismic physical model

An Extrinsic Fiber fabry-perot interferometer for Dynamic Displacement Measurement

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Photonic Sensors 2015年第1期5卷 50-59页

作者： S. PULLTEAP H. C. SEAT Department of Mechanical Engineering Faculty of Engineering and Industrial Technology Silpakorn University(Sanam Chandra Palace Campus) Nakhon Pathom 73000 Thailand Optoelectronics for Embedded Systems Group INPT-ENSEEIHT Rue Charles Camichel BP 7122-31071 Toulouse Cedex 7 France

A versatile fiber interferometer was proposed for high precision measurement. The sensor exploited a double-cavity within the unique sensing arm of an extrinsic-type fiber fabry-perot interferometer to produce the quadrature phase-shifted interference fringes. Interference signal processing was carried out using a modified zero-crossing （fringe） counting technique to demodulate two sets of fringes. The fiber interferometer has been successfully employed for dynamic displacement measurement under different displacement profiles over a range of 0.7 p.m to 140 p.m. A dedicated computer incorporating the demodulation algorithm was next used to interpret these detected data as well as plot the displacement information with a resolution of 2/64. A commercial displacement sensor was employed for comparison purposes with the experimental data obtained from the fiber interferometer as well as to gauge its performance, resulting in the maximum error of 2.8% over the entire displacement range studied.

关键词： fabry-perot interferometer vibration analysis fringe counting technique displacement profile

Zeolite Thin Film-Coated Fiber Sensors Based on fabry-perot interferometer for Detection of Chemical Vapors

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Photonic Sensors 2015年第2期5卷 137-141页

作者： Xiangping NING Chunliu ZHAO Feifei SHI Juan KANG Institute of Optoelectronic Technology China Jiliang University Hangzhou 310018 China

A novel zeolite-coated fiber sensors for detection of volatile organic compounds （VOCs） based on the fabry-perot interferometer was proposed and demonstrated. The sensor comprised a polycrystalline silicalite thin film grown up on the cleaved end face of a standard single-mode fiber. The inline fabry-perot cavity was composed by the end face of the single-mode fiber and the thin film. The sensor device operated by measuring the interference signal, which was a function of the amount of chemical vapor adsorption in its crystalline micro porous structure. Experimental results showed that the proposed VOC sensor worked well and the sensitivities were 2.78×10^-3dB/ppm when the concentration ranged from 350ppm to 2100ppm and 1.23×10^-3 dB/ppm when the concentration ranged from 2100ppm to 5250 ppm.

关键词： Zeolite film volatile organic compound (VOC) sensor fabry-perot interferometer

Fiber fabry-perot interferometer for Curvature Sensing

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Photonic Sensors 2016年第4期6卷 339-344页

作者： Catarina S. MONTEIRO1 Marta S. FERREIRA Susana O. SILVA Jens KOBELKE Kay SCHUSTER JOrg BIERLICH Orlando FRAZAO Department of Physics and Astronomy Sciences Faculty Porto University Rua do Campo Alegre 687 4169-007 Porto Portugal INESC-TEC Rua do Campo Alegre 687 4169-007 Porto Portugal IPHT Jena - Leibniz Institute of Photonic Technology Albert-Einstein-Str. 9 07745 Jena Germany

A curvature sensor based on an fabry-perot （FP） interferometer was proposed. A capillary silica tube was fusion spliced between two single mode fibers, producing an FP cavity. Two FP sensors with different cavity lengths were developed and subjected to curvature and temperature. The FP sensor with longer cavity showed three distinct operating regions for the curvature measurement. Namely, a linear response was shown for an intermediate curvature radius range, presenting a maximum sensitivity of 68.52 pm/m-1. When subjected to temperature, the sensing head produced a similar response for different curvature radii, with a sensitivity varying from 0.84 pm/℃ to 0.89 pm/℃, which resulted in a small cross-sensitivity to temperature when the FP sensor was subjected to curvature. The FP cavity with shorter length presented low sensitivity to curvature.

关键词： Curvature measurement fabry-perot interferometer optical fiber sensor

Pressure Sensor Based on the Fiber-Optic Extrinsic fabry-perot interferometer

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Photonic Sensors 2011年第1期1卷 72-83页

作者： Qingxu YU Xinlei ZHOU School of Physics and Optoelectronic Technology Dalian University of TechnologyDalian116023P.R.China

Pressure sensors based on fiber-optic extrinsic fabry-perot interferometer(EFPI)have been extensively applied in various industrial and biomedical *** this paper,some key improvements of EFPI-based pressure sensors such as the controlled thermal bonding technique,diaphragm-based EFPI sensors,and white light interference technology have been *** progress on signal demodulation method and applications of EFPI-based pressure sensors has been *** demodulation algorithms based on the cross correlation and mean square error(MSE)estimation have been proposed for retrieving the cavity length of *** measurement with a resolution of 0.08 nm over large dynamic range has been carried *** downhole monitoring,an EFPI and a fiber Bragg grating(FBG)cascade multiplexing fiber-optic sensor system has been developed,which can operate in temperature 300℃with a good long-term stability and extremely low temperature ***-based EFPI pressure sensors have been successfully used for low pressure and acoustic wave *** results show that a sensitivity of 31 mV/Pa in the frequency range of 100 Hz to 12.7 kHz for aeroacoustic wave detection has been obtained.

关键词： Pressure measurement fabry-perot interferometer signal demodulation downhole monitoring fiber acoustic sensor

Nanostrain Measurement Using Chirped Bragg Grating fabry-perot interferometer

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Photonic Sensors 2012年第1期2卷 77-80页

作者： Ricardo M. SILVA Marta S. FERREIRA Jose L. SANTOS Orlando FRAZAO INESC Porto Rua do Campo Alegre 687 4169-007 Porto Portugal and Faculty of Sciences of University of Porto Rua do Campo Alegre 687 4169-007 Porto Portugal

A simple nanostrain direct current （DC） measurement system based on a chirped Bragg grating fabry-perot （FP） structure is presented. The FP cavity, formed between the chirped fiber Bragg grating （CFBG） and the fiber end face, presents an aperiodic behavior due to the CFBG. A laser located in the fringe pattern slope is used to interrogate the sensing head. The optical power parameter is analyzed when strain is applied, for long and short period fringe pattern wavelengths, and sensitivities of-2.87 μW/με and-5.48μW/με are respectively obtained. This configuration presents a resolution of 70 ε.

关键词： Optical fiber sensor fabry-perot interferometer chirped fiber Bragg grating

Reconstruction of fabry–perot cavity interferometer nanometer micro-displacement based on Hilbert transform

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Chinese Optics Letters 2021年第9期19卷 13-17页

作者： Hongwei Liang Yu Sun Zhen Huang Chunlei jiang Zihua Zhang Lingling Kan College of Electrical and Information Engineering Northeast Petroleum UniversityDaqing 163318China School of Physics Science and Technology Lingnan Normal UniversityZhanjiang 524048China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China

A novel reconstruction method of nanometer micro-displacement of fabry-perot(F-P)interference is proposed in this *** transforms are performed for F-P interference fringes,and the obtained signal performs tangent operation with the original ***,the validity of the proposed algorithm and the structure are verified by simulation and several experimental measurements for *** from the experiments show that the maximum relative error is 4.9%.

关键词： displacement reconstruction phase unwrapping fabry-perot interferometer

Photonic Crystal Fiber fabry-perot interferometers With High-Reflectance Internal Mirrors

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Photonic Sensors 2015年第2期5卷 97-101页

作者： Rong FAN Yuanbin HOU Wei SUN School of Electric and Control Engineering Xi 'an University of Science and Technology Xi 'an 710054 China Chongqing Research Institute of China Coal Technology Engineering Group Chongqing 400039 China Chongqing Engineering Research Center of Key Technologies of Mine Internet of Things Chongqing 400039 China

We demonstrated an in-line micro fiber-optic fabry-perot interferometer with an air cavity which was created by multi-step fusion splicing a muti-mode photonic crystal fiber （MPCF） to a standard single mode fiber （SMF）. The fringe visibility of the interference pattern was up to 20 dB by reshaping the air cavity. Experimental results showed that such a device could be used as a highly sensitive strain sensor with the sensitivity of 4.5 pm/με. Moreover, it offered some other outstanding advantages, such as the extremely compact structure, easy fabrication, low cost, and high accuracy.

关键词： Fiber-optic sensors fabry-perot interferometer photonic crystal fiber strain measurement

IONIC SELF-ASSEMBLY AND HUMIDITY SENSITIVITY OF POLYELECTROLYTE MULTILAYERS

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Chinese Journal of Polymer Science 2002年第1期20卷 1-7页

作者：余海湖 Fiber Optic Sensing Technology Center Wuhan University of Technology Wuhan 430070 China

Multilayer thin films of alternately adsorbed layers of polyelectrolytes PDDA and PS-119 were formed on both planar silica substrates and optical fibers through the ionic self-assembly technique. Intrinsic fabry-perot cavities were fabricated by stepwise assembling the polyelectrolytes onto the ends of optical fibers for the purposes of fiber optical device and sensor development. Ionically assembled polyelectrolyte multilayer thin films, in which. there are hydrophilic side groups with strong affinity towards water molecules, are a category of humidity-sensitive functional materials. The polyelectrolyte multilayer thin film fabry-perot cavity-type fiber optical humidity sensor can work over a wide range from about 0% RH to about 100% RH with a response time less than 1 s.

关键词： ionic self-assembly polyelectrolyte multilayer thin film humidity fabry-perot interferometer fiber optical sensor

Characterization of Miniature Fiber-Optic fabry-perot Interferometric Sensors Based on Hollow Silica Tube

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Photonic Sensors 2016年第3期6卷 193-198页

作者： Pinggang JIA Guocheng FANG Daihua WANG Postdoctoral Research Station of Optical Engineering Chongqing University Chongqing 400030 China Key Laboratory of Instrumentation Science & Dynamic Measurement of the Ministry of Education of China NorthUniversity of China Taiyuan 030051 China Key Laboratory of Optoelectronic Technology and Systems of the Ministry of Education of China ChongqingUniversity Chongqing 400030 China

A miniature fiber-optic fabry-perot interferometer （MOFPI） fabricated by splicing a hollow silica tube （HST） with inner diameter of 4 μm to the end of a single-mode fiber is investigated and experimentally demonstrated. The theoretical relationship between the free spectrum range and the length of HST is verified by fabricating several MOFPIs with different lengths. We characterize the MOFPIs for temperature, liquid refractive index, and strain. Experimental results show that the sensitivities of the temperature, liquid refractive index, and strain are 16.42μm/℃, -118.56dB/RIU, and 1.21 pm/με, respectively.

关键词： Fiber-optic fabry-perot interferometer hollow silica tube characterization