空气耦合超声隐身涂层脱粘缺陷检测技术  

The technology for detecting debonding defect in air-coupled ultrasonic stealth coatings

作　　者：常俊杰[1,2] 李咸君 刘远 郑阳 CHANG Junjie;LI Xianjun;LIU Yuan;ZHENG Yang(Key Laboratory of Nondestructive Testing Technology,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China;China Special Equipment Inspection&Research Institute,Beijing 100029,China)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,江西南昌330063 [2]中国特种设备检测研究院,北京100029

出　　处：《中国测试》2025年第2期148-154,共7页China Measurement & Test

基　　金：国家自然科学基金(52305580);江西省自然科学基金(20224BAB214052)。

摘　　要：常规超声检测方法对于涂层缺陷的检测操作复杂,不易检出。为解决隐身涂层厚度小,缺陷反射回波信号易产生互相混叠、难以区分等问题,首先开展基于空气耦合超声检测技术的隐身涂层厚度检测和界面脱粘缺陷检测数值模拟仿真研究与实验。通过分析超声波在被检样品内部的传播特性,接着对仿真信号进行时频域处理分析,提出一种基于小波变换多尺度模极大值的隐身涂层缺陷检测方法。结果表明:该方法能够识别出每一个极大值平均值对应的异质界面,对厚度约为500μm的隐身涂层超声信号在不同界面处产生的奇异点进行检测,可实现较高精度的涂层厚度检测与涂层内弱粘结缺陷的识别和定位功能。The conventional ultrasonic detection method faces challenges in detecting coating defects due to its complex operation.To address the issue of small thickness in stealth coatings and the difficulty in distinguishing reflection echo signals from mutual aliasing,this study conducts numerical simulation research and experiments on stealth coating thickness detection and interface debonding defect detection using air coupling ultrasonic detection technology.By analyzing the propagation characteristics of ultrasonic waves in the sample and examining simulation signals in the time-frequency domain,a method based on wavelet transform multi-scale mode maximum is proposed for detecting defects in stealth coatings.The results demonstrate that this method can accurately identify heterogeneous interfaces corresponding to each maximum value,as well as detect singularities generated by ultrasonic signals at different interfaces with a thickness of approximately 500μm.This approach achieves precise coating thickness detection,weak bonding defect identification,and localization.

关 键 词：空气耦合超声 隐身涂层 数值模拟 脱粘缺陷 

分 类 号：TB9[一般工业技术—计量学]