基于ARM的超声波流量计A/D转换电路设计  

Design of the A/D Conversion Circuit for Ultrasonic Flowmeter Based on ARM

作　　者：张兴红[1] 张慧[1] 王先全[1] 冯济琴[1] 王生宝 

机构地区：[1]重庆理工大学机械检测技术与装备教育部工程研究中心,重庆400054 [2]甘肃省武威市凉州区电力局,武威733000

出　　处：《自动化与仪表》2010年第11期18-21,26,共5页Automation & Instrumentation

基　　金：重庆市自然科学基金项目资助(CSPC2008DD2336)

摘　　要：针对高精度超声波流量计价格不菲的缺点,以时差法超声波流量计为理论基础,借鉴国内外先进的超声波流量测量技术,选用高性价比的12位低功耗模数转换器ADC12DL040芯片和ARM处理器LPC2138设计了基于ARM的超声波流量计A/D转换电路。实验结果表明所设计的A/D转换电路很好地实现了超声波回波信号的高速高分辨率采样,A/D的最小分辨时间为0.305ns,在解决超声波流量计关键技术问题的同时降低了生产成本,为低成本高精度超声波流量计的研制打下了坚实的基础。Because the high-accuracy ultrasonic flowmeter has shortcomings of expensive,it has designed the A/D conversion circuit for ultrasonic flowmeter based on ARM.On the base of time-difference method ultrasonic flowmeter theory and the domestic-overseas advanced skill,a cost-effective low-power 12-bit ADC12DL040 chip and ARM processor LPC2138 were chosen for the design.The experimental results indicated that the designed A/D conversion circuit is able to accomplish the high-speed and high-resolution ultrasonic echo signal sampling,the minimum resolu-tion time of A/D conversion circuit is 0.305ns.The design and implementation of A/D conversion circuit for ultrasonic flowmeter not only lower the production cost,but also lay a solid foundation for the low-cost high-accuracy ultrason-ic flowmeter research.

关 键 词：超声波流量计 时差法 A/D转换 ARM 数据采集 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]