-微功耗超声波流量计.docVIP

ni 毕业设计（论文） 微功耗超声波流量计 院 别 自动化工程系 专业名称 测控技术与仪器 班级学号 学生姓名 施旺旺 指导教师 齐世清 2012年 6 月 15 日 微功耗超声波流量计 摘 要 本文研究了以超声波时差法为原理的微功耗流量计，介绍了其应用范围、特点及与一般流量计相比较所具有的优势。分析了流量计的工作原理、硬件结构、软件流程、产生误差的原因和解决办法，以及在微功耗超声波流量计设计开发过程中应注意的问题。设计采用微功耗单片机（MSP430系列单片机），超声波专用收发侦测芯片TDC-GP2芯片，扩展相应的接口电路，实现流量的采集与处理。采用超声波专用收发侦测芯片TDC-GP2，外接超声波发射与接收探头，实现顺流与逆流超声波的收发，通过测量时差，得出超声波流速。时差等信息通过SPI串行口送入单片机，由单片机计算出流速，累计计算出流量。LCD显示器显示流速与流量。TDC-GP2作为高精度的时间测量芯片，不但集成了时间测量功能，还针对超声波流量计和热量表的应用提供超声波换能器驱动脉冲以及温度测量功能。相对于使用分立元件或者FPGA的超声波流量计方案，使用TDC-GP2的方案大大简化了硬件电路设计，显著降低了整机功耗，成为电路最简洁、功耗最低的超声波流量计方案。通过硬件调试和软件仿真，本微功耗超声波流量计可行且具有实际价值。 关键词：超声波，微功耗，流量计，声速补偿  Micro-power ultrasonic flowmeter Abstract Author：Shi Wangwang Tutor：Qi Shiqing In this paper, we study a Micro-power flowmeter based on the principles of ultrasonic wave. Introduction of its range of applications, features, and advantages compared with the general flowmeter. Analysis the flowmeter of the hardware structure, software process works and the causes of errors and solutions, also the problems which should pay attention to during the design and development process of flowmeter. Design uses a micro-power microcontrollers (MSP430 MCU)Ultrasonic detection of specific transceiver chip TDC-GP2, the corresponding expansion of the interface circuit to achieve acquisition and processing of flow. Adopt specific detection of ultrasonic transceiver chip TDC-GP2, external transmit and receive ultrasonic probe, to achieve transceiver of downstream and Upstream ultrasonic, by measuring the time difference, obtained ultrasonic velocity. Sending the time difference and other information into the microcontroller through the SPI serial port, the microcontroller calculate flow rate and the total flow. Power-down.LCD display flow rate and total flow.TDC-GP2 is a high-precision time measurement chip which does no