超声回波信号包络解析的实现方法

Implementation of Envelope Analysis Method of the Ultrasonic Echo

本文对超声脉冲回波信号进行理论分析,提出了一种超声脉冲波用于高精度测距和测厚中的回波包络解析实现方法。在FPGA器件上,对高速ADC采样的回波数据进行带通滤波去噪声,并构造两个正交滤波器,实现了对超声脉冲回波信号的包络曲线提取。最后采用测量标准钢块厚度的实验数据验证了此实现方法的可行性。

On the basis of the studying in the linear ultrasonic system, presents an effective envelope analysis method of ultrasonic pulse used in the thickness measurement . In FPGA - based implementation of this method, the echo wave of ultrasonic pulse sampled by high speed ADC is filtered with band pass filter to reduce the noise. Two orthogonal filters are designed to get the envelope curve of the ultrasonic pulse echo. The experimental results of measuring the thickness of some steel - board with the same ultrasonic probes mani- fest that the method of envelope analysis is effective.