光纤M-Z干涉仪用于声发射探测的理论与实验研究
硕士研究生：张森 指导教师：梁艺军教授 学位级别：工学硕士 学科、专业：光学工程
所在单位：理学院
论文提交时间：2005年6月日 论文答辩时间：2005年6月日 学位授予单位：哈尔滨工程大学
摘 要
声发射技术在无损检测、地震预测、混凝土结构检测、应力测量、微位移测量等领域应用很广泛。光纤传感器的主要特点是灵敏度高、频带宽、体积小。本课题的研究目的是对声发射探测的理论分析，并结合干涉式光纤传感器技术，探索并研究研制一种新的干涉式光纤声发射传感器检测系统的可行性。
论文给出了“n”状结构的Math-Zehnder干涉式光纤声发射传感器检测系统的结构和工作原理，理论上分析了这种结构的光纤声发射传感器与声表面波之间的相互作用。实验结果表明：这种结构的声发射传感器的灵敏度与传感器的个数和光纤有效长度呈线性关系，且有很强的方向性，适合于工业上声表面波的定向检测。
关键词：声发射；声发射传感器；灵敏度：定向检测
Abstract
Acoustic emission technology has been used in non—destructive testing，earthquake forecast，concrete monitoring，stress measurement，tiny displacement measurement and so on．The main characteristic of optical fiber sensor is high sensitivity,wide bandwidth and small bulk．The target of this Paper is to combine theoretic analysis of acouStic emission monitoring with interferometric optical fiber sensor technology to study the feasibility which to excogitate a new interferometric optical fiber acoustic emission sensor monitoring system．
This paper gives the structure and principle of interferometric optical fiber acoustic emission sensor with“n”configuration based on optical fiber Mach-Zehnder interferometer and analyses the interacting between optical fiber sensorand acoustic surface wave in theory．The experimental results make know that the sensitivity of this optical fiber acoustic emission sensor iS proportional to the effective length of optical fiber and number of sensor At the same time，the good direction difference of this sensor is found via experiment．So this interferometricoptical fiber acoustic emission sensor is fit for beamed monitoring of acoustic stirface wave in industry．
Keywords：acoustic emission；interferometric optical fiber sensor；sensitivity
beamed monitoring
光纤M-Z干涉仪用于声发射探测的理论与实验研究全文
