中文摘要：

针对传统声发射定位系统存在的结构复杂、难以组网、定位精度低等问题,设计了一种基于光纤布拉格光栅（FBG）传感器网络和时间反转聚焦成像的声发射定位方法。在对时间反转聚焦定位原理分析的基础上,利用四个FBG传感器构建四点定位系统,并采用窄带激光边缘滤波技术实现信号解调。利用Morlet小波提取信号中特定频率成分,并计算模值和时差。通过建立时间反转聚焦模型实现声发射源定位,并在铝合金板结构上对整套成像定位方法进行验证。实验结果表明,该方法能有效地对400mm×400mm监测区域进行声发射定位成像,定位误差小于20mm,耗时小于2s。为声发射检测和定位提供了一种新的方法。

英文摘要：

For the problems of complicated structure, difficults to networking and low accuracy of traditional acoustic emission localization system, an acoustic emission localization based on fiber Bragg grating （FBG） sensor network and time reversal focusing imaging technology is designed. Based on the analysis of the principle of time reversal focusing, positioning system by four FBG sensors is built and narrow band laser edge filter technology is used to realize signal demodulation. Morlet wavelet transform is used to extract specific frequency component signal, and calculate the modulus value and time lag. Through the establishment of time reversal focusing model, acoustic emission location is realized. The localization method is verified in the aluminum alloy plate. The experimental result shows that this method can effectively realize localization and imaging of acoustic emission source, and localization error is less than 20 ram, and time consumption is less than 2 s. A new method is provided for acoustic emission detection and localization.