中国激光, 2020, 47 (10): 1010004, 网络出版: 2020-10-09   

基于光纤布拉格光栅传感器的光电复合缆绳应变测量 下载: 691次

Strain Measurement of Photoelectric Composite Cable Based on Fiber Bragg Grating Sensor
陶冶 1,2张素侠 1,2,*
作者单位
1 天津大学机械工程学院力学系, 天津 300354
2 天津市非线性动力学与混沌控制重点实验室, 天津 300354
摘要
光电复合缆绳是系留无人机的生命线,可以起到电力传输和信号传输的作用。当缆绳内部张力过大时,内部光纤会出现断裂情况,为了掌握缆绳内部的张力分布,需对缆绳的应变进行测量。使用光纤布拉格光栅传感器测量复合缆绳的轴向应变时发现,细长复合缆绳的大幅快速运动容易引起缆绳的局部弯曲,导致反射谱的反射峰出现分裂现象。基于材料力学理论分析了复合缆绳弯曲时反射峰发生分裂的原因,通过实验对理论分析结果进行了验证,并提出了一种改进的测量方法,避免了粘胶和缆绳内部剪力对测量结果的影响,有效提高了轴向应变测量的准确性。
Abstract
Photoelectric composite cable is the lifeline of tethered unmanned aerial vehicle, which transmits power and signal. When the internal tension of the cable is too large, the internal optical fiber will break. In order to monitor the tension distribution inside the cable, it is necessary to measure the strain of the cable. When fiber Bragg grating sensor is used to measure the axial strain of the composite cable, it is found that the large-scale and rapid movement of the slender composite cable will easily cause the local bending of the cable, resulting in the splitting of the reflection peak of the reflection spectrum. Based on the theory of mechanics of materials, the reason why the reflection peak splits during the bending of composite cable is analyzed. The theoretical analysis result is verified by experimental, and an improved measurement method is proposed, which avoids the influence of viscose and internal shear force of cable on the measurement result, and effectively improves the accuracy of axial strain measurement.

陶冶, 张素侠. 基于光纤布拉格光栅传感器的光电复合缆绳应变测量[J]. 中国激光, 2020, 47(10): 1010004. Tao Ye, Zhang Suxia. Strain Measurement of Photoelectric Composite Cable Based on Fiber Bragg Grating Sensor[J]. Chinese Journal of Lasers, 2020, 47(10): 1010004.

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