超声测厚中的A/D转换,是个较为特殊的模拟量——数字量的转换问题。通过对几种可能的A/D转换方式进行分析,得出结论:积分法和脉冲展宽法均是可行的,其中以脉冲展宽法为优选方案。并且,对超声测厚系统中的模数转换器在调试中需要综合考虑的因素,也作了梗概的介绍。 Ultrasound Thickness in the A / D conversion, is a more special analog - digital conversion problem. Through the analysis of several possible A / D conversion methods, it is concluded that both the integral method and the pulse broadening method are feasible, and the pulse broadening method is the preferred solution. And, in the ultrasonic thickness measurement system in the analog-digital converter needs a comprehensive consideration of factors, but also made a synopsis.