中北大学电子测试技术国家重点实验室,太原 030051
TP274
国家自然科学基金（41904080）；山西省重点研发计划（201903D121118）；山西省回国留学人员科研资助项目（2020-111）
National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051
超声波流量计因其具有良好的场地适用性在工业生产领域有良好的应用前景。为了满足实际生产对于液体流量测量精度的要求，采用互相关算法检测超声波的渡越时间（TOF），降低了计算时间误差。利用FPGA内部资源设计实现互相关算法模块，并调整逻辑结构精简算法，减少资源占空比。测试结果表明，该方法有效提高了渡越时间的测量精度。在0-3000mm的测量范围内，渡越时间的相对误差低至0.44%。超声波流量计在层流区域的相对误差低于3.68％，湍流区域的相对误差小于0.64％。
Ultrasonic flowmeter has a good application prospect in the field of industrial production because of its good site applicability. In order to meet the requirements of the actual production for the accuracy of liquid flow measurement, the cross-correlation algorithm is used to detect the ultrasonic transit time (TOF), which reduces the calculation time error. Using FPGA internal resources to design and implement cross-correlation algorithm module, and adjust the logical structure to simplify the algorithm, reduce the resource duty cycle. The test results show that this method can effectively improve the measurement accuracy of transit time. In the range of 0-3000mm, the relative error of transit time is as low as 0.44%. The relative error of ultrasonic flowmeter is less than 3.68% in laminar flow region and less than 0.64% in turbulent flow region.
杨瑞峰,朱义德,郭晨霞,葛双超.互相关渡越时间超声波流量计精度补偿[J].电子测量技术,2021,44(5):62-67
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