Simultaneous acoustic and magnetic measurement using cascaded fibre Bragg grating

X, Bai; Hu, Manli; Gang, Tingting; Rong, Qiangzhou

doi:10.1016/j.yofte.2018.07.017

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Mulle et al [6] employed longitudinally and transversely embedded FBGs to monitor the hot-press molding process of glass-fiber-reinforced polypropylene (GFPP) laminates. Bai et al [7] used two cascaded FBGs to measure both the acoustic and magnetic properties simultaneously. Zhao et al [8] proposed a novel integrated optical fiber sensor for temperature, pressure and flow measurements.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Responses Measured by Optical Fiber Sensor for Structural Health Monitoring

Her

Chung

2019

Applied Sciences

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An optical fiber sensing system integrating a fiber Bragg grating (FBG) sensor, a long-period fiber grating (LPFG) optical filter and a photodetector is presented to monitor the dynamic response of a structure subjected to base excitation and impact loading. The FBG sensor is attached to a test specimen and connected to an LPFG filter. As the light reflected from the FBG sensor is transmitted through the long-period fiber grating filter, the intensity of the light is modulated by the wavelength, which is affected by the strain of the FBG. By measuring the intensity of the light using a photodetector, the wavelength reflected from the FBG sensor can be demodulated, thus leading to the determination of the strain in the structure. To demonstrate its effectiveness, the proposed sensing system was employed to measure the dynamic strain of a beam subjected to mechanical testing. The mechanical tests comprised three load scenarios: base excitation by a shaker at resonant frequency, impact loading by a hammer and shock test on a drop table. To monitor the dynamic strain during the test and validate the accuracy of the measurement of the FBG sensor, strain gauge was used as reference. Experimental results show good correlation between the measurements of FBG sensor and strain gauge. The present work provides a fast response and easy-to-implement optical fiber sensing system for structural health monitoring based on real-time dynamic strain measurements.

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Section: Introductionmentioning

confidence: 99%