表面焊接式光纤布喇格光栅应变传感器的疲劳性能研究

针对用于起重机械结构健康监测的光纤布喇格光栅(FBG)应变传感器疲劳性能未知问题, 采用动态载荷与静态拉伸相结合的试验方法, 对起重机械钢结构疲劳损伤监测中的3种封装形式FBG应变传感器开展了疲劳性能研究, 分析了反映传感器性能的灵敏度系数、带宽、边摸抑制比、峰谷比、零点波长、动态应变分别随疲劳次数增加时的变化情况。试验结果表明: 3种封装方式的FBG应变传感器疲劳前后, 在加载、卸载相同载荷时, 灵敏度系数相差最大不超过0.1 pm/με, 带宽均值为0.19~0.23 nm, 峰谷比和边摸抑制比随疲劳次数的增加变化趋势相同, 零点波长变化最大值为0.31 nm, 动态应变符合二次指数函数分布特征。

Abstract

Aiming at the unknown fatigue performance of fiber Bragg grating(FBG) strain sensors used in crane structure health monitoring, the fatigue performance of three packaged FBG strain sensors used in crane structure fatigue damage monitoring is studied by combining dynamic load with static tensile test method. The sensitivity coefficient, bandwidth, edge rejection ratio, peak-valley ratio, zero-point wavelength and dynamic strain of the sensor are analyzed with the increase of fatigue frequency. The test results show that before and after fatigue, when loading and unloading the same load, the difference of sensitivity coefficients is no more than 0.1 pm/με, the mean bandwidth is 0.19 nm to 0.23 nm, the peak to trough ratio and edge rejection ratio change with the increase of fatigue frequency, and the maximum change of zero wavelength is 0.31 nm. The dynamic strain conforms to the distribution characteristics of quadratic exponential function.

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陈光, 丁克勤, 张继旺. 表面焊接式光纤布喇格光栅应变传感器的疲劳性能研究[J]. 光通信技术, 2023, 47(2): 6. CHEN Guang, DING Keqin, ZHANG Jiwang. Research on fatigue performance of surface-welded fiber Bragg grating strain sensor[J]. Optical Communication Technology, 2023, 47(2): 6.

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