相移光纤光栅对超声波信号的频率响应特性研究  

Research on the frequency response characteristics of phase-shifted fiber grating to ultrasonic signal

作　　者：彭敏 张学智 江俊峰 刘琨 陈冠龙 孙浩楠 李泽宇 刘铁根 PENG Ming;ZHANG Xuezhi;JIANG Junfeng;LIU Kun;CHEN Guanlong;SUN Haonan;LI Zeyu;LIU Tiegen(Key Laboratory of Optoelectronic Information Technology,Ministry of Education,Institute of Optical Fiber Sensing,School of Precision Instruments and Optoelectronics Engineering,Tianjin University,Tiaryin 300072,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,光电信息技术教育部重点实验室,天津大学光纤传感研究所,天津300072

出　　处：《光电子．激光》2021年第12期1329-1337,共9页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(U1833104、61735011和61675152)资助项目。

摘　　要：为实现利用相移光纤Bragg光栅(phase-shifted fiber Bragg grating,PS-FBG)代替压电陶瓷(piezoelectric ceramics,PZT)进行结构损伤检测,本文研究了PS-FBG对100 kHz—1.5 MHz范围内的超声波信号的频率响应特性。搭建了超声波激励信号的产生平台和高灵敏度光纤光栅平衡传感系统,利用幅度分析法对连续超声波激励下的传感器响应信号进行分析。由于薄板存在共振频率的问题,使用时间长度为0.5 ms的突发型激励信号,并用能量分析法评估传感器的响应情况。实验结果表明,PS-FBG传感器的频率响应在±3.49 dB范围内,由此可得PS-FBG传感器对100 kHz—1.5 MHz范围内的超声波信号具有宽谱响应的特性。In order to identify the structural damage with phase-shifted fiber grating(PS-FBG)instead of piezoelectric ceramics(PZT),we studied the frequency response characteristics of PS-FBG ultrasonic signals in the range of 100 kHz—1.5 MHz ultrasonic signals.We built an ultrasonic excitation signal generation platform and a fiber grating balance sensing system with high sensitivity to detect the response signals excited by continuous ultrasonic,which are analyzed by amplitude analysis method.Due to the resonance frequency of the thin plate,a burst excitation signal with a time length of 0.5 ms was used,and the response of the sensor is evaluated by an energy analysis method.The experimental results demonstrated that the frequency response of the PS-FBG sensor is in the range of±3.49 dB,and the PS-FBG sensor has a wide-spectrum response to the ultrasonic signals in the range of 100 kHz—1.5 MHz.

关 键 词：损伤检测 相移光纤Bragg光栅(phase-shifted fiber Bragg grating PS-FBG) 超声波信号 频率响应 

分 类 号：TN65[电子电信—电路与系统]