基于DSP的数字式超声波流量计的设计.pdf

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2005年第 24卷第 2期传感器技术(Journal of Transducer Technology) 54
设计与制造
基于 DSP的数字式超声波流量计的设计
易灵芝 1 , 王根平 2
(1. 湘潭大学信息工程学院,湖南湘潭 411105; 2. 深圳职业技术学院机电系,广东深圳 518055)
摘要: 通过采用对超声波信号波形进行采样及对所采样的数据进行相关信号处理的数字实现方法,克
服了以往在设计超声波流量计时对几个关键电平的依赖,在降低电路设计难度的同时,大大增强了对干扰
的抑制能力,有效地提高了流量计的测量精度和稳定性。实验证明:该数字式超声波流量计的精度接近
0. 1 % ,性能稳定,有很好的实用前景。
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关键词: 数字采样; 数字信号处理; 相关性; 时差法; 超声波流量计
中图分类号: TP814 文献标识码: B 文章编号: 1000 - 9787 (2005) 02 - 0045 - 03
Design of digital ultrason ic flowmeter based on DSP
YIL ing zhi1 , WANG Gen p ing2
( 1. Coll of Info Eng in, X iangtan Un iversity, X iangtan 411105, Ch ina;
2. D ept of M ech & Elec, Shenzhen Polytechn ic, Shenzhen 518055, Ch ina)
Abstract: An effective method is used to avoid interferences and imp rove the accuracy and the stability for the
measurement of digital ultrasonic flowmeter through the way of samp ling the signal wave and dealing with all the
samp les with digital correlating algorithm. This method also makes the ultrasonic flowmeter free from the electric
voltages test in some key points in the circuit system, and the design of the electric circuit e easier. The
simulation and experiment p rove that the digital ultrasonic flowmeter system is of high stability and p recision
which can reach nearly 0. 1 %. The future of such a digital ultrasonic flowmeter will be excellent in the
app lication.
Key wor