Page 101 - 《应用声学》2021年第2期

第 40 卷 第 2 期 Vol. 40, No. 2
2021 年 3 月 Journal of Applied Acoustics March, 2021

⋄ 研究报告 ⋄

时差法超声波流量计测量精度的补偿方法 ∗

郭 涛 王志强 † 李 成

(中北大学 仪器科学与动态测试教育部重点实验室 太原 030051)

摘要：超声波时差法测量精度的提高，不仅使流量计的测量值更加准确，更能满足工业生产监控的智能化及自
动化的需求。文中对时差法流量计的测量原理以及影响因素进行分析，结合超声波接收原理，设计了过零检测
电路结构，并在顺逆流的时间差的测量问题上，应用互相关算法，完成对时间测量的自补偿。实验结果显示：在
采取以上补偿方法后，能有效改善流量计精度，时差测量误差小于 0.8%，并提高了测量实时性。
关键词：超声波；时差法；过零检测；互相关；自补偿
中图法分类号: TH814 文献标识码: A 文章编号: 1000-310X(2021)02-0269-05
DOI: 10.11684/j.issn.1000-310X.2021.02.014

Compensation method for measuring accuracy of transit-time ultrasonic
flowmeter

GUO Tao WANG Zhiqiang LI Cheng

(Key Laboratory for Electronic Testing Science and Technology, North University of China, Taiyuan 030051, China)

Abstract: The improved measurement accuracy of the ultrasonic time difference method not only makes the
measured value of the flowmeter more accurate, but also meets the needs of intelligent and automated industrial
production monitoring. The paper analyzes the measurement principle of compensation method for flowmeter
and influencing factors. Combined with the principle of ultrasonic reception, the zero-crossing detection circuit
structure is designed, and the cross-correlation algorithm is applied to the measurement of the time difference
between the forward and reverse currents to complete the self-compensation for the time measurement. The
experimental results show that after the above compensation method is adopted, the accuracy of the flowmeter
can be effectively improved, the measurement error of transit-time method is less than 0.8%, and the real-time
measurement is improved.
Keywords: Ultrasonic; Transit-time method; Zero crossing detection; Cross-correlation; Self compensation

2020-05-30 收稿; 2020-09-11 定稿
国家自然科学基金项目 (51975541)
∗
作者简介: 郭涛 (1971– ), 男, 山西临汾人, 硕士, 研究方向: 微机电系统微器件设计制造和微传感器集成的研究。
† 通信作者 E-mail: 860991610@qq.com