中国激光, 2016, 43 (5): 0505002, 网络出版: 2016-05-04   

基于光纤光栅的应力波检测技术研究

Detection Technique of Stress Waves Based on Fiber Bragg Grating
作者单位
1 合肥工业大学仪器科学与光电工程学院, 安徽 合肥 230009
2 北京卫星制造厂, 北京 100094
摘要
提出了一种利用光纤布拉格光栅实现对分离式霍普金森压杆产生的应力波的检测方法,简述了其工作原理,并且探讨了杆中产生的应变与光纤光栅中心波长漂移量间的关系。将光纤光栅及应变片均沿轴向对称粘贴于被测圆柱杆同一截面的外侧,对两杆直接撞击及通过波形整形器撞击后杆中产生的应变脉冲进行了检测。在上述两种情况下,将光纤光栅及应变片的检测结果分别进行对比分析,发现两者时域波形吻合;对其进行频谱分析,两者频域成分一致。当撞击速度为11.33 m/s时,光纤光栅测得的最大应变为-1087.04 με,其相对误差为2.26%;粘贴波形整形器后,撞击速度为9.8 m/s,光纤光栅测得的波速为5236.4 m/s,其相对误差为2.84%,误差范围基本能满足工程测试的要求。
Abstract
The detecting method of stress wave generated by split Hopkinson pressure bar based on fiber Bragg grating (FBG) is proposed; the principle is outlined and the relationship between strain and center wavelength shift of FBG is discussed. The strain pulses generated by direct impact and impacting with the pulse shaper are measured using the FBG and strain gauges which are axially symmetrically pasted to the same section of the cylindrical rod. It can be concluded that the time domain signal and the frequency spectrum of the results with FBG and strain gauges are consistent by contrast and analysis. The maximum strain reaches -1087.04 με with error of 2.26% for a given impacting velocity of 11.33 m/s. When FBG and the pulse shaper are adopted, the impacting veloctiy is 9.8 m/s, and the longitudinal wave speed is measured to be 5236.4 m/s with the error of 2.84%. The error range can meet the basic requirements of engineering tests.

孙诗惠, 余有龙, 李慧, 钱牧云, 赵曾, 殷参, 赖小明. 基于光纤光栅的应力波检测技术研究[J]. 中国激光, 2016, 43(5): 0505002. Sun Shihui, Yu Youlong, Li Hui, Qian Muyun, Zhao Zeng, Yin Shen, Lai Xiaoming. Detection Technique of Stress Waves Based on Fiber Bragg Grating[J]. Chinese Journal of Lasers, 2016, 43(5): 0505002.

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