Journal
JOURNAL OF AEROSPACE ENGINEERING
Volume 32, Issue 1, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)AS.1943-5525.0000960
Keywords
Fiber Bragg grating (FBG); Superwide-range displacement monitoring; Displacement sensor; Eccentric gear; Crack measurement
Categories
Funding
- National Natural Science Foundation of China [51578347]
- Natural Science Foundation of Liaoning Province [2015020578]
- Taishan Scholar Priority Discipline Talent Group program - Shandong Province
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Aiming at the large displacement monitoring needs of slope, road, and bridge engineering, a new method concerning the superwide-range fiber Bragg grating (FBG) displacement sensor based on eccentric gear was investigated. The structure of the sensor was designed and the formula for the wavelength-displacement relationship was established via waveform fitting from calibration tests. The lateral displacement of a first-story shear wall was successfully monitored in a hysteresis test of a steel frame-reinforced concrete infill wall. A FBG relative displacement sensor was developed refitting a superwide-range fiber Bragg grating displacement sensor based on eccentric gear. The refitted sensor was applied in a self-repairing performance test of a shape memory alloy (SMA) strengthened concrete beam. The monitoring results of the crack were compared with the results of an integrated test instrument, and the results showed that the sensor exhibited very good accuracy. The innovative FBG displacement sensor has a low influence on the structure, strong practicability, and good prospects for engineering applications.
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