Study on vibration sensing performance of an equal strength cantilever beam based on an excessively tilted fiber grating

Luo, Binbin; Yang, Wanmeng; Hu, Xinyu; Lu, Haitao; Shi, Shanshan; Zhao, Mingfu; Lu, Ye; Xie, Lang; Sun, Zhongyuan; Zhang, Lin

doi:10.1364/ao.57.002128

Cited by 18 publications

(2 citation statements)

References 17 publications

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“…However, the tapered fibers are fragile, which results in poor mechanical strength of the sensor head. Fiber Bragg gratings have also been extensively used for vibration sensing [5][6][7][8]. It normally requires a wavelength scanning light source to demodulate the Bragg reflection wavelength, so the detectable frequency range is usually quite limited.…”

Section: Introductionmentioning

confidence: 99%

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

et al. 2018

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We report the demonstration of a novel in-fiber spatially integrated Michelson interferometer based on weakly coupled multicore fiber (MCF) for vibration sensing. The compact interferometer is constructed by using two separate cores of the MCF, where the fiber end is cleaved in order to generate strong Fresnel reflection, and independent light coupling between the cores of MCF and the single mode fibers (SMFs) is enabled by the fanin coupler. Vibration gives rise to differential strain variation between cores which results in the modification of phase difference of the interferometer. A narrow linewidth laser is employed, in order to interrogate the phase change induced reflection power variation. Vibration event can be identified and the vibration frequency can be retrieved by processing the measured reflection power with fast Fourier transform (FFT). Broad vibration frequency response range up to 12 kHz (limited by the cutoff frequency of the voltage driver of the vibration source) has been achieved. Performance of the sensor has been shown to be independent of the selection of different core pairs, where the MCF is wound to a piezoelectric transducer (PZT). The proposed in-fiber integrated spatial interferometer does not require any special processing of the fiber (e.g., tapering, splicing, and so forth). The unique sensor structure provides some extraordinary merits, including ultra-compact size, high mechanical strength, high sensitivity and temperature insensitivity.

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Section: Introductionmentioning

confidence: 99%

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

et al. 2018

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“…To solve this problem, some researchers used the deflection method to calibrate strain sensors. The deflection method is used to calculate the surface strain of an equal strength beam based on the deflection of the beam [ 21 , 22 , 23 ]. Tu et al [ 24 ] used the method to calculate the surface strain of an equal strength beam, finding that there was a good linear relationship between the strain value and the load.…”

Section: Introductionmentioning

confidence: 99%

Calibration Model Optimization for Strain Metrology of Equal Strength Beams Using Deflection Measurements

Yan

Cui

et al. 2023

Sensors

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Strain sensors, especially fiber Bragg grating (FBG) sensors, are of great importance in structural health monitoring, mechanical property analysis, and so on. Their metrological accuracy is typically evaluated by equal strength beams. The traditional strain calibration model using the equal strength beams was built based on an approximation method by small deformation theory. However, its measurement accuracy would be decreased while the beams are under the large deformation condition or under high temperature environments. For this reason, an optimized strain calibration model is developed for equal strength beams based on the deflection method. By combining the structural parameters of a specific equal strength beam and finite element analysis method, a correction coefficient is introduced into the traditional model, and an accurate application-oriented optimization formula is obtained for specific projects. The determination method of optimal deflection measurement position is also presented to further improve the strain calibration accuracy by error analysis of the deflection measurement system. Strain calibration experiments of the equal strength beam were carried out, and the error introduced by the calibration device can be reduced from 10 με to less than 1 με. Experimental results show that the optimized strain calibration model and the optimum deflection measurement position can be employed successfully under large deformation conditions, and the deformation measurement accuracy is improved greatly. This study is helpful to effectively establish metrological traceability for strain sensors and furthermore improve the measurement accuracy of strain sensors in practical engineering scenarious.

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High precision temperature and strain discrimination using TCF–TPMF fiber structure based Sagnac interferometer

Zhang

Wang

et al. 2022

Optics Communications

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Study on vibration sensing performance of an equal strength cantilever beam based on an excessively tilted fiber grating

Cited by 18 publications

References 17 publications

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

Robust in-fiber spatial interferometer using multicore fiber for vibration detection

Calibration Model Optimization for Strain Metrology of Equal Strength Beams Using Deflection Measurements

High precision temperature and strain discrimination using TCF–TPMF fiber structure based Sagnac interferometer

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