Theoretical and experimental investigation of fiber Bragg gratings with different lengths for ultrasonic detection
Theoretical and experimental investigation of fiber Bragg gratings with different lengths for ultrasonic detection
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DOI：
10.1007/s13320-016-0307-y
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发表时间：
2016-04
期刊：
影响因子：
4.4
通讯作者：
Zhonglong Yu;Q. Jiang;Hao Zhang;Jun-jie Wang
中科院分区：
文献类型：
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作者：
Zhonglong Yu;Q. Jiang;Hao Zhang;Jun-jie Wang
本文从理论和实验两方面研究了光纤光栅在超声波作用下的响应。虽然光纤光栅传感器已被广泛应用于实际结构健康监测的超声检测，但光栅长度与超声频率之间的关系尚未得到。针对这一问题，设计了一种基于光纤光栅的超声检测系统，并对不同长度光栅的响应灵敏度进行了测试。实验结果表明，当检测高频超声波时，长度为3mm的光栅具有较高的灵敏度，其幅值可达0.6mV。10mm长的光栅对低频超声波有较好的检测灵敏度，幅值为0.8mV。分析结果为高灵敏度的超声损伤检测系统提供了有用的工具。
In this paper, the response of fiber Bragg gratings (FBGs) subjected to the ultrasonic wave has been theoretically and experimentally investigated. Although FBG sensors have been widely used in the ultrasonic detection for practical structural health monitoring, the relationship between the grating length and ultrasonic frequency is not yet to be obtained. To address this problem, an ultrasound detection system based on FBGs is designed and the response sensitivity of different lengths gratings are detected. Experimental results indicate that the grating with 3 mm length has a higher sensitivity when detecting high frequency ultrasonic wave, and the amplitude can be up to 0.6 mV. The 10 mm length grating has better detection sensitivity for low frequency ultrasonic wave and the amplitude is 0.8 mV. The results of this analysis provide useful tools for high sensitivity ultrasound detection in damage detection systems.