摘要
为了使超声波流量计的精度范围能达到±0.5%,研究了时差法超声波的测量原理,分析了实现高精度测量的设计方法。介绍了系统的工作过程和硬件组成,详细阐述了测时芯片高速时间数字转换器TDC-GP21(Time-to-Digital-Con-verter)的结构和功能原理,以及其在超声波流量计时间测量模块中系统硬件部分的实现。采用TDC-GP21,ARM微处理器、超声波收发电路等硬件架构,实现了高精度测量超声波顺流和逆流传播时间差。实验结果和精度分析表明,研制的超声波流量计符合设计要求,并为超声波流量计的高精度和低功耗设计提供了一个参考。
In order to make the accuracy of ultrasonic flowmeter reach ,the measurement principle of time-difference ultrasonic is studied, and the method to achieve high-precision measurements is analyzed. The system work process and hardware composition is introduced . The structure and principle of high-speed interval measuring chip TDC-GP21 as well as the hardware realization of ultra- sonic measurement system is mainly elaborated. The high-precision measurement of ultrasonic downstream and upstream propagation time difference was achieved by using TDC-GP21, ARM microprocessor, ultrasonic transceiver circuit and other hardware architec- ture. The experiment result and accuracy analysis confirms that the ultrasonic flowmeter developed in this way can meet the design re- quirements. It provides a reference for high-accuracy and low-power design of ultrasonic flowmeter.
出处
《现代电子技术》
2012年第12期134-136,共3页
Modern Electronics Technique
