小波变换在激光无损检测中的应用

摘要

厚度是液体无损检测中一个重要的影响因素。而小波变换作为重要的信号处理手段对动态误差的阈值判断和多尺度小波变换在去噪方面有着巨大的优势。通过搭建的激光无损测试平台，对获取的数据进行多阶小波分解以及软门限的阈值处理，对比传统的滤波方法，验证了小波变换在激光无损检测中运用的优越性。实验结果表明，小波变换在激光无损检测中有着更好的去噪效果，对公共场所的液体无损检测将具有巨大意义。%Thickness is an important influencing factor in liquid non-destructive testing (NDT). Wavelet trans⁃form as an important signal processing means has many advantages such as dynamic error threshold determination and multi-scale wavelet transform de-noising. The obtained data are performed multi-level wavelet decomposition and threshold processing of soft threshold through constructing a NDT platform. Comparing with traditional filtering method, the advantages of wavelet transform used in laser NDT are verified. Experimental results show that wavelet transform in laser NDT has better denoising effect and has great significance for liquid NDT on public.