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Temperature Insensitive bending sensor Based on In-Line Mach-Zehnder Interferometer

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Photonic sensors 2014年第3期4卷 193-197页

作者： Xue CHEN Yongqin YU Xiaomei XU Quandong HUANG Zhilong OU Jishun WANG Peiguang YAN and Chenlin DU College of Electronic Science and Technology Shenzhen University Shenzhen 518060 China College of Physics Science and Technology Shenzhen Key Laboratory of Sensor Technology Shenzhen UniversityShenzhen 518060 China

A simple and compact fiber bending sensor based on the Maeh-Zehnder interferometer was proposed. A photonic crystal fiber （PCF） with a length of 10mm was spliced by collapsing air holes with two conventional single mode fibers to consist of an all fiber bending sensor. The sensitivity of 0.53nm/m-1 was obtained at 1586nm for the curvature range from 0 to 8.514 m-1. The temperature sensitivity was very low. The measurement error due to the temperature effect was about 8.68x10-3 m-1/℃, and the temperature effect in the curvature measurement could be ignored. This device can avoid the cross sensitivity of the temperature in the curvature measurement.

关键词： Photonic crystal fiber Mach-Zehnder interferometer bending sensor

Four-core fiber-based bending sensor

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Frontiers of Optoelectronics 2008年第Z2期1卷 231-236页

作者： Shigang ZHAO Xue WANG Libo YUAN National University Science Park Harbin Engineering University Harbin 150001 China Department of Physics Harbin Engineering University

A novel four-core fiber-based bending sensor has been proposed. The four-core fiber is used as the sensing element, the four cores of the fiber act as a four-beam interferometer, and the far-field interferogram grids with periodical distributions are formed on the fiber output end. Since the phase difference is a function of the radius of curvature, the change of the radius of curvature shifts the far-field interferometric grid pattern. A low-coherence laser diode with wavelength of 650 nm is adopted to illuminate the fiber, and the interferogram pattern in the farfield is recorded by a CCD camera. The relationship between the far-field grid pattern intensity distribution and the radius of curvature is established theoretically and confirmed experimentally.

关键词： fiber optics four-core fiber bending sensor far field grid pattern

Exceptional-point-enhanced sensing in an all-fiber bending sensor

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Opto-Electronic Advances 2023年第12期6卷 36-43页

作者： Zheng Li Jingxu Chen Lingzhi Li Jiejun Zhang Jianping Yao Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China Microwave Photonics Research Laboratory School of Electrical Engineering and Computer ScienceUniversity of OttawaOttawaON K1N 6N5Canada

An exceptional-point(EP)enhanced fiber-optic bending sensor is *** sensor is implemented based on paritytime(PT)-symmetry using two coupled Fabry-Perot(FP)resonators consisting of three cascaded fiber Bragg gratings(FBGs)inscribed in an erbium-ytterbium co-doped fiber(EYDF).The EP is achieved by controlling the pumping power to manipulate the gain and loss of the gain and loss FP *** a bending force is applied to the gain FP resonator to make the operation of the system away from its EP,frequency splitting occurs,and the frequency spacing is a nonlinear function of the bending curvature,with an increased slope near the ***,by measuring the frequency spacing,the bending information is measured with increased *** achieve high-speed and high-resolution interrogation,the optical spectral response of the sensor is converted to the microwave domain by implementing a dual-passband microwave-photonic filter(MPF),with the spacing between the two passbands equal to that of the frequency *** proposed sensor is evaluated experimentally.A curvature sensing range from 0.28 to 2.74 m^(−1) is achieved with an accuracy of 7.56×10^(−4 )m^(−1 )and a sensitivity of 1.32 GHz/m^(−1),which is more than 4 times higher than those reported previously.

关键词： exceptional-point enhanced sensitivity bending sensor parity-time symmetry.

Vector bending sensor based on chirped long-period grating with off-axis micro-helix taper

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Chinese Optics Letters 2023年第6期21卷 36-42页

作者：周健何学兰陈宏洲熊子洋杨菁关春颖苑立波 Key Laboratory of In-fiber Integrated Optics Ministry of EducationHarbin Engineering UniversityHarbin 150001China Photonics Research Center Guilin University of Electronics TechnologyGuilin 541004China

Vector bending sensing has been consistently growing in many fields.A low-cost and high sensitivity vector bending sensor based on a chirped long-period fiber grating[LPFG]with an off-axis micro helix taper is proposed and experimentally *** grating is composed of several sections of single-mode fiber with gradually larger lengths,and the off-axis micro helix tapers with fixed lengths when they are fabricated by using the arc discharge *** large refractive index modulation in the micro-helix taper greatly reduces the sensor *** total length of the sensor is only 4.67 *** micro-helix taper-based LPFG can identify the bending direction due to the asymmetric structure introduced by the micro *** experimental results show that the transmission spectra of the sensor have distinct responses for different bending directions,and the maximum bending sensitivity is 14.08 nm/m^(-1)in the range from 0.128 m^(-1)to 1.28 m^(-1).The proposed bending sensor possesses pronounced advantages,such as high sensitivity,small size,low cost,and orientation identification,and offers a very promising method for bend measurement.

关键词： bending sensor chirped long-period fiber grating off-axis micro helix taper orientation identification

Sawtooth-enhanced bend sensor for gesture recognition

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Science China(Technological Sciences) 2024年第6期67卷 1727-1736页

作者： BAI YanRu ZHANG ZiHang WANG HaoYu GUO Rui LI XiSheng School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China School of Advanced Engineering University of Science and Technology BeijingBeijing100083China School of Precision Instrument and Opto-Electronics Engineering Tianjin UniversityTianjin300072China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China

Gesture recognition has diverse application prospects in the field of human-computer ***,gesture recognition devices based on strain sensors have achieved remarkable results,among which liquid metal materials have considerable advantages due to their high tensile strength and *** improve the detection sensitivity of liquid metal strain sensors,a sawtooth-enhanced bending sensor is proposed in this *** with the results from previous studies,the bending sensor shows enhanced resistance *** addition,combined with machine learning algorithms,a gesture recognition glove based on the sawtooth-enhanced bending sensor is also fabricated in this study,and various gestures are accurately *** the fields of human-computer interaction,wearable sensing,and medical health,the sawtooth-enhanced bending sensor shows great potential and can have wide application prospects.

关键词： liquid metal bending sensor gesture recognition machine learning

Multi-direction bending sensing based on spot pattern demodulation of dual-hole fiber

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Chinese Optics Letters 2023年第12期21卷 92-96页

作者：李波瑶梁瑶瑶谢仲业左小杰孙敬华 School of Electronic Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China Centre de Nanosciences et de Nanotechnologies CNRSUniversitéParis-SaclayC2N91120 PalaiseauFrance

A multi-direction bending sensor based on spot pattern demodulation of a dual-hole fiber(DHF)is *** using the interference and scattering in a DHF,the related multidirectional variations can be captured by the optical ***,the multi-directional bending characteristics of the fiber are quantitatively described by the pattern of the output light spot,achieving multidirectional bending *** addition,considering the subtle changes in the deformation patterns over time,a convolutional neural network(CNN)model based on deep learning is introduced for accurate recognition and prediction of the bending *** experimental results show that the sensor can perceive different bending angles in four *** outstanding results indicate that the multi-directional bending sensor based on dual-hole interference pattern decoding has potential applications in multi-directional quantitative sensing and artificial intelligence perception.

关键词： microstructured optical fiber fiber device bending sensor