基于MAX35104的超声波气体流量检测系统的设计与研究

针对现有超声波气体流量计精度不高的弱点,本文采用时差法测量原理,设计了基于MAX35104的流量检测系统。为提高测量精度,采用新型的高精度时间数字转换芯片MAX35104作为计时测量核心,采用Z安装方式,实现对顺逆流时间差的测量；为实现低功耗,采用超低功耗单片机STM32F103为系统控制核心,实现数据处理和结果显示。介绍了MAX35104时间间隔测量方法,边沿检测原理以及相应硬件测量电路的实现方法。测试结果证明该超声波气体流量计的精度可达行业标准的1级要求。

Design and Study of Ultrasonic Gas Flow Measurement System Based on MAX35104

In view of the weakness of the existing ultrasonic gas flowmeter, this paper adopts the measuring principle of time difference method and designs the flow detection system based on MAX35104. In order to improve the measurement accuracy, the MAX35104, a new type of high-precision time-to-digital converter, is used as the core of timing measurement. The Z installation method is adopted to measure the time difference between upstream and the downstream. In order to achieve low power consumption, the ultra-low power microcontroller STM32F103 is used as the control core of the system to realize data processing and result display. This paper describes the method of MAX35104 time interval measurement, the principle of edge detection and the corresponding hardware measurement circuit implementation. The results show that the accuracy of the ultrasonic gas flowmeter flowmeter can reach the 1 level requirements of the industry standard.