A Study on Low-frequency FBG Acceleration Transducer for Seismic Monitoring

• Published in: IEEE sensors journal Vol. 24; no. 3; p. 1
• Main Authors: Qiu, Zhongchao, Zhang, Yufeng, Zhang, Jinquan, Teng, Yuntian, Wang, Xiaomei
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acceleration sensor; Bragg gratings; Curved beams; Double curved beam m; Earthquakes; Fiber Bragg Grating (FBG); Fiber gratings; Low frequency; Monitoring; Resonant frequencies; Seismic response; Sensitivity; Sensors; Transducers; Vibration analysis; Vibration measurement; Vibration monitoring; Vibration tests; Vibrations
• ISSN: 1530-437X; 1558-1748
• DOI: 10.1109/JSEN.2023.3341860

In response to the fact that it's difficult for current optical transducers to meet requirements on low-frequency seismic vibration monitoring, a low-frequency FBG acceleration transducer designed with double curved beam reed as pick-up structure was proposed, and its structural parameters were analyzed and optimized, and tested in a low-frequency vibration test system. The result suggested that the acceleration transducer functioned at a natural frequency of 41 Hz and offered flat response at 2-32 Hz; its lower frequency limit, dynamic range and sensitivity were 0.5 Hz, 76.8 dB, 966.65 pm/g, respectively; the acceleration transducer exhibited favorable linearity and resistance to lateral interference. Compared with other FBG sensors for measuring low-frequency vibration characteristics, the weight of the double-curved beam reed FBG sensor is 200 g and the volume is only 40 cm3, which can provide reference for promoting the engineering application of the FBG acceleration sensor in the field of low-frequency vibration measurement.