基于激光超声表面波的盆式绝缘子表面开口缺陷成像与定量赵洲峰1，薛志祥2，邹君文3，周桢3，吴一峰3，张俊2（1.国网浙江省电力有限公司电力科学研究院，杭州310014；2.武汉大学动力与机械学院，武汉430062；3.杭州意能电力有限公司，杭州310013）摘要：针对盆式绝缘子表面开口缺陷精准检测的迫切需求，文中提出一种基于激光超声表面波的盆式绝缘子成像检测及缺陷定量方法，利用高速振镜实现超声信号的非接触式扫描激励和快速采集，利用声场互易原理实现超声传播及其与缺陷相互作用过程的动态显示，以相邻信号相关度为指标实现表面开口缺陷的高对比度成像，基于中值滤波和索贝尔算子边缘提取实现缺陷尺寸的精确测量。设计和制造圆孔和刻槽两类缺陷对所提出方法进行验证，结果表明：所提成像方法可以同时检出位于探头正前方以及具有一定偏转角度方位上的缺陷，所提定量方法对位于探头正前方表面开口缺陷的定量精度达到95%。关键词：盆式绝缘子；激光超声；相关度；缺陷定量ImagingandQuantificationonInsulatingSpacerSurfaceOpeningDefectBasedonLaserUltrasonicSurfaceWaveZHAOZhoufeng1，XUEZhixiang2，ZOUJunwen3，ZHOUZhen3，WUYifeng3，ZHANGJun2（1.StateGridZhejiangElectricPowerCorporationResearchInstitute，Hangzhou310014，China；2.SchoolofPowerandMechanicalEngineering，WuhanUniversity，Wuhan430062，China；3.E.EnergyTechnologyCo.，Ltd.，Hangzhou310013，China）Abstract:Inviewoftheurgentneedofaccuratedefectionofinsulatingspacersurfaceopeningdefect，akindofimag⁃ingdetectionanddefectquantitativemethodofinsulatingspacerbasedonlaserultrasonicsurfacewaveisproposedinthispaper.Thenon⁃contactscanningexcitationandfastacquisitionofultrasonicsignalareachievedbyusinghigh⁃speedgalvanometer.Thedynamicdisplayofinteractionbetweenultrasonicpropagationanddefectisrealizedbytheuseofsoundfieldreciprocityprinciple.Theadjacentsignalcorrelationistakenasindicatorsotorealizethehighcon⁃trastimagingofdefect，andtheaccuratemeasurementofdefectsizeisachievedbyedgeextractionbasedonmedianfilterandsobeloperator.Theproposedmethodisverifiedbydesigningandmanufacturingsuchtwodefectsascircu⁃larholeandgroovingdefects.Itisshownbytheresultthattheproposedimagingmethodcansimultaneouslyd...
