基于微纳耦合光纤传感器的模态声发射源线性定位研究  

Linear positioning for modal acoustic emission source based on micronano-fiber coupled sensors

作　　者：付文成 刘懿莹[1] 王霖洁 李凤梅 FU Wencheng;LIU Yiying;WANG linjie;LI Fengmei(School of Electrical Engineering,Xi’an Jiaotong University,Xi ’an 710049,China)

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《振动与冲击》2019年第1期79-88,共10页Journal of Vibration and Shock

基　　金：中国博士后科学基金(2017M613119)

摘　　要：微纳耦合光纤由于其抗电磁干扰能力强,制作简单和解调成本低,在声发射检测领域具有良好的应用前景。但将其与模态声发射源定位技术相结合还未有报道。利用微纳耦合光纤传感器,通过S0/A0峰值定位方法和A0/A0阈值定位方法实现了对模态声发射源的线性定位;分析了Gabor变换时间分辨率对S0/A0定位方法中模态识别准确度的影响规律,和A0/A0定位方法中等值线阈值对定位结果的影响规律;对比讨论了两种定位方式的定位精度、定位范围和定位重复性。本研究对微纳耦合光纤传感器在模态声发射源定位中的实际应用具有积极的指导意义。Due to their strong anti-electromagnetic interference ability,being easy to make,and low demodulation cost,micronano-fiber coupled sensors(MFCSs)have a good application prospect in the field of acoustic emission.However,their application in modal acoustic emission source positioning is not reported.Here,linear positioning for modal acoustic emission source was realized based on the S 0/A 0 peak value positioning method and the A 0/A 0 threshold one using MFCS.The influence law of Gabor transform’s time resolution on the accuracy of modal recognition in the S 0/A 0 positioning method and that of isopleth threshold in the A 0/A 0 positioning method on the positioning results were analyzed.The positioning accuracy,positioning range and positioning repeatability of two methods were compared and discussed.This study provided a guide for practical application of micronano-fiber coupled sensors in modal acoustic emission sources’linear positioning.

关 键 词：微纳耦合光纤传感器 模态声发射 频散特性 线性定位 

分 类 号：TN253[电子电信—物理电子学]