超声波流量计的低功耗高精度时间测量方法

Low Power and High Precision Time Measurement Method of Ultrasonic Flow Meter

时间测量是超声波流量计的关键技术,分析了一种低功耗高精度的时间测量方法。介绍了时差法超声波流量计工作原理和超声波流量计低功耗高精度的设计方法,采用超低功耗的MSP430单片机及"零功耗"高速CPLD技术实现了设计方案。该方法设计的超声波流量计具有计量精度高、管径范围宽、不接触流体、不易堵塞、使用方便等特点,测时精度可以达到2.5 ns以上。

Measure of time is a key technique of ultrasonic flow meter. A low power and high precision time-measurement method was analyzed. Work theory of time difference ultrasonic flow meter was described. Low power and high precision design method of ultrasonic flow meter was presented. It achieved the designing project that made use of technique of super low power Msp430 MCU and ‘zero power＇ high speed CPLD. The ultrasonic flow meter has some characteristic, such as high measurement precision, big pipe diameter width, untouehing flow ,jam mingless, using convenience.