Materials, Photonic Devices, and Sensors

Analysis and experimental study on the strain transfer mechanism of an embedded basalt fiber-encapsulated fiber Bragg grating sensor

[+] Author Affiliations
Zhenglin Zhang, Yuan Wang, Yangyang Sun, Qinghua Zhang, Zewei You, Xiaodi Huang

PLA University of Science and Technology, Nanjing, China

Opt. Eng. 56(1), 017105 (Jan 13, 2017). doi:10.1117/1.OE.56.1.017105
History: Received November 14, 2016; Accepted December 27, 2016
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Abstract.  The precision of the encapsulated fiber optic sensor embedded into a host suffers from the influences of encapsulating materials. Furthermore, an interface transfer effect of strain sensing exists. This study uses an embedded basalt fiber-encapsulated fiber Bragg grating (FBG) sensor as the research object to derive an expression in a multilayer interface strain transfer coefficient by considering the mechanical properties of the host material. The direct impact of the host material on the strain transfer at an embedded multipoint continuous FBG (i.e., multiple gratings written on a single optical fiber) monitoring strain sensor, which was self-developed and encapsulated with basalt fiber, is studied to present the strain transfer coefficients corresponding to the positions of various gratings. The strain transfer coefficients of the sensor are analyzed based on the experiments designed for this study. The error of the experimental results is 2  μϵ when the strain is at 60  μϵ and below. Moreover, the measured curves almost completely coincide with the theoretical curves. The changes in the internal strain field inside the embedded structure of the basalt fiber-encapsulated FBG strain sensor could be easily monitored. Hence, important references are provided to measure the internal stress strain of the sensor.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Zhenglin Zhang ; Yuan Wang ; Yangyang Sun ; Qinghua Zhang ; Zewei You, et al.
"Analysis and experimental study on the strain transfer mechanism of an embedded basalt fiber-encapsulated fiber Bragg grating sensor", Opt. Eng. 56(1), 017105 (Jan 13, 2017). ; http://dx.doi.org/10.1117/1.OE.56.1.017105


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