基于巴克码编码脉冲压缩的混凝土超声检测仿真分析  

Simulation Analysis of Ultrasonic Testing Based on Pulse Compression of Barker Coding for Concrete

作　　者：王志刚 胥凯晖[2] 王萍 王海涛 沈佳卉 WANG Zhi-gang;XU Kai-hui;WANG Ping;WANG Hai-tao;SHEN Jia-hui(Nanchang Architecture Science Institute Co.,Ltd.,Nanchang 330096,China;Group 94829 of PLA,Nanchang 330201,China;The Second construction Co.,Ltd.of China Construction First Group,Beijing 100161,China;Power China Jiangxi Electric Power Engineering Limited Company,Nanchang 330096,China)

机构地区：[1]南昌市建筑科学研究所有限公司,南昌330096 [2]中国人民解放军94829部队,南昌330201 [3]中建一局集团第二建筑有限公司,北京100161 [4]中国电建集团江西省电力设计院有限公司,南昌330096

出　　处：《失效分析与预防》2023年第5期294-299,共6页Failure Analysis and Prevention

基　　金：国家自然科学基金(12364056);江西省主要学科和技术带头人资助计划(20204BCJL22039);江西省自然科学基金重点项目(20212ACB204014)。

摘　　要：混凝土的超声检测中,由于混凝土材料的非均质结构而造成的结构噪声是影响超声检测效果的重要因素之一。为了进一步提高超声检测信号的信噪比,提出应用具有良好的自相关特性以及噪声抑制优势的巴克码信号作为激励信号。设计和建立混凝土结构模型,进行仿真测试及检测结果的成像处理与分析,将本研究所提方法的成像结果与常规高斯脉冲反射法的成像结果进行对比。结果表明,通过对检测信号的脉冲压缩处理以及旁瓣抑制处理,有效压缩了脉冲宽度,提高了检测信号的时空分辨率,从而增强成像结果的信噪比;采用本研究方法处理后的成像结果信噪比提高了8.3 dB,成像质量明显提升。In ultrasonic testing of concrete,structural noise caused by the heterogeneous structure of concrete materials is one of the important factors affecting the effectiveness of ultrasonic testing.In order to further improve the signal-to-noise ratio of ultrasonic testing signals,it is proposed to use Barker code signal as excitation signal,which has good autocorrelation characteristics and noise suppression advantages.A concrete structure model was designed and established for conducting simulation tests,and imaging processing and analysis of detection results.The imaging results by the proposed method were compared with those through the conventional Gaussian pulse reflection method.The results show that the spatiotemporal resolution of the detection signal is improved and related signal-to-noise ratio is enhanced because of the compressed pulse width and suppressed sidelobe in the detection signals.Moreover,with this method,the signal-to-noise ratio of the results is improved by 8.3 dB and the imaging quality is significantly promoted.

关 键 词：混凝土 超声检测 巴克码信号 脉冲压缩 旁瓣抑制 

分 类 号：TG115.28[金属学及工艺—物理冶金]