基于电压电流比的瞬态电磁流量测量方法

doi:10.3969/j.issn.1000-1158.2019.05.15

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摘要为了实现较高的励磁频率,提高响应速度,同时减少电磁流量计的功耗,提出基于电压电流比值的瞬态测量方法,确定电压电流比值与流量之间的关系。设计了基于DSP的硬件,采集瞬态时的励磁电流和信号电压来验证该处理方法,离线数据分析表明,电压电流比值与流量有良好的线性关系。设计的DSP软件可实时实现瞬态测量方法,并进行水流量标定和功耗测试实验。实验结果表明,流量测量准确度达到0.5级,与普通电磁流量计相同。功耗对比表明,基于瞬态测量原理的电磁流量计的励磁功耗是普通电磁流量计的30%。

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关键词 ：计量学, 电磁流量计, 瞬态测量, 电压电流比值, 低功耗

Abstract：In order to achieve higher excitation frequency, improve response speed, and reduce the power consumption of electromagnetic flowmeter, the transient measurement method based on voltage-to-current ratio was proposed to determine the relationship between voltage-to-current ratio and flow. The hardware based on DSP was designed, then the excitation current and signal voltage in the transient state was collected to verify the processing method. The analysis of off-line data indicated that the relationship between ratio and flow is well. The transient measurement method was implemented in real time by the designed DSP software, and the calibration experiment of water flow was performed, and the power consumption was also tested. The results of experiment show that the measurement accuracy reaches class 0.5, same as ordinary electromagnetic flowmeter. Comparison shows that excitation power consumption of electromagnetic based on transient measurement principle is 30% of the ordinary.

Key words： metrology electromagnetic flowmeter transient measurement voltage-to-current ratio low power consumption

收稿日期: 2018-03-12 发布日期: 2019-09-01

PACS:

TB937

通讯作者: 徐科军(1956-), 男, 江苏无锡人, 合肥工业大学教授, 博士生导师, 主要从事传感器技术、自动化仪表和数字信号处理方面的研究。 Email: dsplab@hfut.edu.cn E-mail: dsplab@hfut.edu.cn

作者简介: 吴建平(1993-), 河南周口人, 合肥工业大学在读硕士研究生, 主要研究方向为自动检测技术。 Email: 1447933638@qq.com

引用本文:

吴建平,徐科军,许伟,汪春畅,于新龙. 基于电压电流比的瞬态电磁流量测量方法[J]. 计量学报, 2019, 40(5): 829-834.
WU Jian-ping,XU Ke-jun,XU Wei,WANG Chun-chang,YU Xin-long. Transient Electromagnetic Flow Measurement Method Based on Voltage-to-current Ratio and its Realization. Acta Metrologica Sinica, 2019, 40(5): 829-834.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2019.05.15 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2019/V40/I5/829

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