基于高速AD的信号分析在超声波流量计上的应用

Research on First Wave Correction Technique Based on TDC

TDC(MAX35101)是美信公司生产的一款针对于水表和热表领域的超声波流量测量芯片。基于该芯片的超声波流量计虽然测量精度很高,但是抗干扰能力弱,超声波信号易受环境干扰导致流量测量错误。以高精度时间测量芯片TDC和高速AD转换芯片为基础,通过AD模块对超声波信号进行采集,并分析信号质量,获取信号的首波特征,再利用提出的首波错波矫正技术,辅助TDC进行测量,对结果进行正确的矫正,以此增强系统的稳定性和抗干扰能力。最后通过理论分析和样机的实验数据验证了提出技术的有效性。

This paper is based on the high precision time measurement chip TDC and high speed AD conversion chip,through the acquisition of AD module for ultrasonic signal and the signal quality analysis to acquire the first wave signal feature,then using the proposed first wave correction technology,assisting TDC measurement to correct the results,so it can enhance the system stability and anti-jamming capability.