| Citation: | SONG Ying, ZHANG Hao-ran, LI Jian-zhi, SHEN Bo-hao, LIU Zhan-jian. Fiber bragg grating accelerometer based on flexure hinge and bearing[J]. Chinese Optics, 2023, 16(5): 1109-1120. doi: 10.37188/CO.2022-0252
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We develop a fiber Bragg grating accelerometer based on a bearing and flexure hinge for the measurement of medium-high frequency vibration signals. The mathematical model between its natural frequency and sensitivity and structural parameters is derived based on a mechanical model, and the structural design is optimized based on the theoretical analysis results. With these prerequisites, the sensor was fabricated. Ultimately, its dynamic characteristics are validated using a finite element simulation and vibration experiment. The results show that both its operating frequency range and acceleration sensitivity are 10−1200 Hz and 17.25 pm/g. In addition, this proposed sensor has some advantages such as an error of less than 0.3 g, a good linearity of greater than 0.99, a repeatability error of 2.33%, and it is free of temperature.
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