基于声衰减特性的激光超声盆式绝缘子缺陷检测研究  

Laser Ultrasonic Defect Detection of Basin Insulator Based on Acoustic Attenuation Characteristics

作　　者：晋涛 王伟 粱基重 吴海飞 夏慧[2] JIN Tao;WANG Wei;LIANG Jizhong;WU Haifei;XIA Hui(State Grid Shanxi Electric Power Research Institute,Taiyuan 030001,China;Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]国网山西省电力公司电力科学研究院,太原030001 [2]中国科学院电工研究所,北京100190

出　　处：《电瓷避雷器》2023年第3期161-165,共5页Insulators and Surge Arresters

基　　金：国家电网有限公司总部管理科技项目(编号:520530190008)。

摘　　要：激光超声具有非接触、宽频带、高分辨率等优势在无损检测领域受到广泛关注,为了研究GIS盆式绝缘子材料内部及表面的缺陷状态,利用激光超声技术通过研究声衰减特性间接判断缺陷状态的方法。利用30 ns脉冲宽度的激光对5 mm厚度的绝缘子材料试板进行频率为100 kHz的区域扫查,分析了表面气泡缺陷的存在对声衰减系数的影响,通过对有缺陷的区域和无缺陷区域扫查结果的对比分析,得出在有气泡孔洞下其衰减系数会减小,且随着激光能量增大衰减系数增大,当能量达到一定数值时,衰减系数达到一个稳定值的结论,验证了利用声衰减特性对盆式绝缘子材料缺陷检测的可行性,并为微小气泡缺陷定量表征提供了基础。Laser ultrasound has been widely concerned in the field of NDT with its advantages of non-contact,wide band and high resolution.In order to study the defect state of GIS basin-type insulator material,a method to indirectly judge the defect state by studying the acoustic attenuation characteristics using laser ultrasonic technology was proposed.A laser pulse width of 30 ns was used to scan an insulator material sample of a thickness of 5 mm.And the laser ultrasonic signal is received with a frequency of 100 kHz ultrasonic transducer.The influence of surface bubble defects on the acoustic attenuation coefficient is studied.By comparing the scanning results of the defective area and the non-defective area,it is shown that the attenuation coefficient decreases when the bubble defect exists,and increases with the increase of laser energy.When the energy reaches a certain value,the attenuation coefficient reaches a stable value.The feasibility of using acoustic attenuation characteristics to detect defects of basin insulator material is verified.This method also provides a basis for further quantitative characterization of microbubble defects.

关 键 词：激光超声 声衰减特性 盆式绝缘子 无损检测 

分 类 号：TM216[一般工业技术—材料科学与工程]