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.
出处
《自动化与仪表》
北大核心
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)
关键词
超声波流量计
时差法
A/D转换
ARM
数据采集
ultrasonic flowmeter
time-difference method
A/D conversion
ARM
data acquisition
