基于多模光纤声发射检测的理论与实验研究的中期报告摘要：本中期报告主要介绍了基于多模光纤声发射检测的理论和实验研究。首先，介绍了多模光纤的基本结构、工作原理和特点。然后，详细阐述了光纤声发射技术的原理和应用，包括波形分析、缺陷检测等方面。接着，介绍了光纤声发射检测系统的组成和工作原理，其中包括声发射源、传感器、放大器等。最后，通过实验验证了多模光纤声发射检测技术在缺陷检测和结构健康监测方面的应用效果，表明该技术具有较高的检测精度和可靠性，具有广泛的应用前景。关键词：多模光纤，声发射检测，缺陷检测，结构健康监测Abstract:Thisintermediatereportmainlyintroducesthetheoreticalandexperimentalresearchofacousticemissiondetectionbasedonmultimodefiberoptic.Firstly,thebasicstructure,workingprincipleandcharacteristicsofmultimodefiberareintroduced.Then,theprincipleandapplicationoffiberopticacousticemissiontechnologyareelaboratedindetail,includingwaveformanalysis,defectdetection,etc.Then,thecompositionandworkingprincipleoffiberopticacousticemissiondetectionsystemareintroduced,includingacousticemissionsource,sensor,amplifier,etc.Finally,theapplicationeffectofmultimodefiberacousticemissiondetectiontechnologyindefectdetectionandstructuralhealthmonitoringisverifiedthroughexperiments,whichshowsthatthetechnologyhashighdetectionaccuracyandreliability,andhasbroadapplicationprospects.Keywords:multimodefiber,acousticemissiondetection,defectdetection,structuralhealthmonitoring