Open AccessApplication of the Microclamped Fiber Bragg Grating (FBG) Sensor in Rock Bolt Support Quality Monitoring
Author(s) -
Xinxin Guo,
Bo Wang,
Zhenyu Wang,
Wei Yu,
Zhenwang Ma,
Tielun Yang
Publication year - 2020
Publication title -
advances in civil engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 25
eISSN - 1687-8094
pISSN - 1687-8086
DOI - 10.1155/2020/3419835
Subject(s) - fiber bragg grating , calibration , materials science , sensitivity (control systems) , fiber optic sensor , optical fiber , acoustics , strain (injury) , wavelength , rock bolt , optics , structural engineering , fiber , composite material , electronic engineering , optoelectronics , engineering , physics , medicine , quantum mechanics
The force-measuring rock bolt instrumented with bare fiber Bragg grating (FBG) sensors are generally factory-fabricated. To enable users to fabricate a force-measuring rock bolt by themselves, the microclamped FBG sensor is proposed to replace the encapsulated bare FBG sensor. A theoretical formula of strain sensitivity is also established. The strain sensibility measured by indoor calibration is consistent with the theoretical one, indicating that the microclamped FBG sensor can measure strain accurately. Besides, the measured strain sensibility coefficient (wavelength difference/strain) matches the theoretical values, making the installed microclamped sensor free from the need for recalibration and proving the installation method to be reliable. Also, the test sensitivity can be adjusted as needed. The instrumented rock bolt with microclamped FBG sensors shows great mechanical performance in the field test, awaiting further usage in applications.