Chinese Optics, Volume. 16, Issue 5, 1109(2023)
Fiber bragg grating accelerometer based on flexure hinge and bearing
Fig. 3. The influence of structural parameters of FBG accelerometer on natural frequency and sensitivity
Fig. 6. Wavelength shift of FBG under different sinusoidal excitations (500 Hz)
Fig. 10. Sensitivity calibration curves at different vibration acceleration signals. (a) 100 Hz; (b) 300 Hz; (c) 600 Hz; (d)1 000 Hz
Fig. 11. Total sensitivity calibration curves of FBG acceleration sensor
Fig. 12. Time history curves of FBG wavelength caused by different vibration acceleration signals. (a) 100 Hz, 40 g; (b) 300 Hz, 40 g; (c) 600 Hz, 10 g; (d)1 200 Hz, 10 g
Fig. 13. FBG wavelength spectrogram under different frequency vibration excitations
Table 1. Dimensional parameters of FBG accelerometer
View tableView in ArticleTable 1. Dimensional parameters of FBG accelerometer
参数 含义 值 Pe 有效弹光系数 0.22 λ1 FBG1中心波长/nm 1540 λ2 FBG2中心波长/nm 1550 R 柔性铰链切割半径/mm 2.5 t 柔性铰链最小厚度/mm 2 i 柔性铰链宽度（y方向长度）/mm 6 b 质量块长/mm 4 c 质量块宽/mm 35 h 质量块高/mm 15 L 质量块质心到延伸杆端部距离/mm 20 E 304不锈钢弹性模量/GPa 210 Af 光纤横截面积/m2 1.23×10−8 Ef 光纤弹性模量/GPa 72
Table 2. Wavelength shifts of FBG at different accelerations
View tableView in ArticleTable 2. Wavelength shifts of FBG at different accelerations
加速度/g 波长变化量/pm 标准差/pm 第一次 第二次 第三次 平均值 2 42.01 42.37 44.73 43.04 1.48 6 130.60 130.36 134.71 131.89 2.45 10 213.68 217.52 217.53 216.25 2.22 14 301.16 295.53 300.51 299.07 3.08 18 371.33 378.76 385.35 378.48 7.01 22 460.05 457.72 462.66 460.14 2.47 26 538.20 538.20 527.20 534.53 6.35 30 632.40 640.91 626.22 633.18 7.38
Table 3. Performance comparison of FBG accelerometer designed in this paper and reported in other Refs.
View tableView in ArticleTable 3. Performance comparison of FBG accelerometer designed in this paper and reported in other Refs.
文献 结构 固有频率/Hz 平坦区 灵敏度/(pm·g−1) 温度补偿 WU[ 14 ]双悬臂梁 8658 5000 Hz以下 0.44 是 WANG[ 15 ]钢管-质量块弹性结构 3806 1200 Hz以下 4.01 是 LUO[ 19 ]对称双柔性铰链 890 50～600 Hz 41 否 LI[ 21 ]三柔性铰链 2800 50～1000 Hz 21.8 是 本文提出的结构 轴承和柔性铰链 3810.7 10～1200 Hz 17.25 是
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Ying SONG, Hao-ran ZHANG, Jian-zhi LI, Bo-hao SHEN, Zhan-jian LIU. Fiber bragg grating accelerometer based on flexure hinge and bearing[J]. Chinese Optics, 2023, 16(5): 1109
Category: Original Article
Received: Dec. 7, 2022
Accepted: --
Published Online: Oct. 27, 2023
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