Demodulation of a fiber Bragg grating strain sensor by a multiwavelength fiber laser

Cong, Shan; Sun, Yunxu; Zhao, Yuxi; Pan, Lifeng

doi:10.1117/12.923179

Cited by 1 publication

(1 citation statement)

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“…In 2021, Kwon H designed an aircraft health monitoring system on the basis of FBG sensors which was applied to the tail stick structure of ultralight propeller composite aircraft [14] .In 2022, to address the problem of multi-directional strain measurement, Wang Hongke designed a three-way fiber Bragg grating (FBG) strain sensor adopting boss and toroidal substrate structure that achieves the synchronous measurement of strain in three directions of the structure. [15] Fiber Bragg Grating (FBG) [16] provides significant advantages of high sensitivity, immunity to electromagnetic interference, easily networking in the field of vibration monitoring. It could be directly attached to the surface of a structure as a strain sensor, from which the structural strain could be obtained according to the relationship between the amount of change in the wavelength of its reflected light center and the strain.…”

Section: Introductionmentioning

confidence: 99%

A Method of Structural Vibration Deformation Monitoring Based on FBG Strainmeter and Accelerometer Array

Zhao,

Cheng,

Jia

et al. 2023

IEEE Access

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The monitoring of displacement and strain distribution of vibrating structures is very important for maintaining structural safety. In this paper, a monitoring method of structural vibration deformation based on Fiber Bragg Grating (FBG) strainmeter array and accelerometer array is proposed for two different cases of whether the structure surface can be directly pasted with FBGs. In addition, a dynamic deformation estimation based on strain and acceleration data fusion, and a vibration morphology monitoring algorithm based on displacement reconstruction combined with finite element simulation results are proposed, respectively. An FBG accelerometer is designed based on an equal strength beam, for which the geometric parameters are determined by finite element simulation. The test results show that the accelerometer has a stable operating frequency band of 3-20Hz, an average sensitivity of 70pm/g, and a resonant frequency of 56Hz, which provides excellent linearity and consistency. The vibration deformation monitoring experiments were carried out on a cantilever aluminum plate. The results indicate that the measuring system is able to accurately sense the shape change of the structure in real-time with a displacement measurement error is <6%. For the aluminum plate structure without FBG on the surface, the measuring system successfully reconstructed the displacement and strain distribution with a strain measurement error is <10%.

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Section: Introductionmentioning

confidence: 99%