【摘要】 热喷涂涂层厚度多在微米量级，超声检测过程中由于涂层很薄，其上、下界面反射回波将产生叠加与干涉，超声信号波形发生畸变。针对涂层超声信号的奇异性检测问题，该文采用小波变换模极大值法对低碳钢表面上喷涂的铝涂层的超声信号进行奇异性检测，进而测量涂层厚度。实验分析证明，超声测量的铝涂层厚度值与金相测量值基本符合。更多还原

【Abstract】 The thickness of thermal spraying coating is mainly in the order of micron. In the ultrasonic testing process, because the coating is very thin, the reflection echo of the upper and lower interfaces will produce superposition and interference, and the ultrasonic signal waveform will be distorted. In order to detect the singularity of ultrasonic signal of coating, the wavelet transform mode maximum method is used to detect the singularity of ultrasonic signal of aluminum coating sprayed on the surface of low carbon steel, and then measure the thickness of coating. The experimental analysis show that the thickness of aluminum coating measured by ultrasonic is consistent with that measured by metallography.更多还原