基于可变阈值和过零检测的四声道气体超声波流量变送器

doi:10.3969/j.issn.1000-1158.2019.02.15

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摘要针对四声道气体超声波流量计,提出基于可变阈值和过零检测的数字信号处理方法,快速、准确定位回波信号,提高系统抗干扰能力。设计了集中采集-集中处理数据的工作模式和双发双收的收发方式,采用FPGA和DSP双核架构,研制了四声道气体超声波流量变送器。利用FPGA擅长并行处理和复杂逻辑控制的优势,实现换能器双发双收、高速DAC和ADC的驱动控制以及数据存储,完成信号的集中采集;利用DSP擅长数字信号处理的优势,实时实现数字信号处理方法,完成信号的集中处理。气体流量标定实验结果表明:研制的四声道气体超声波流量计满足0.5级精度相关技术指标的要求。

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	穆立彬
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关键词 ：计量学, 气体超声波流量计, 四声道, 可变阈值, 过零检测

Abstract：For the four-channel ultrasonic gas flow-meter, a digital signal processing method based on variable threshold and zero-crossing detection is proposed to locate the echo signals quickly and accurately and improve the anti-interference ability of the system. And the working process that centralized sampling-centralized processing of data and the transceiver way that double emission double receive were designed. A transmitter of four-channel ultrasonic gas flow-meter was developed based on FPGA & DSP dual core structure. It realizes the double emission double receive transceiver way, controls the high-speed ADC & DAC and storages the data by taking the advantage of the parallel processing capacity and better logic control ability of FPGA, completing the centralized sampling of data. On the other hand, it realizes the real time digital signal processing method by using the high-speed computing capacity of DSP, completing the centralized processing of data. The gas calibration experiment results show that the four-channel ultrasonic gas flow-meter developed meets the needs of the related technical indicators of the 0.5-level precision ultrasonic gas flow-meter.

Key words： metrology ultrasonic gas flow-meter four-channel variable threshold zero-crossing detection

收稿日期: 2017-12-18 发布日期: 2019-03-07

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研究。Email:dsplab@hfut.edu.cn E-mail: dsplab@hfut.edu.cn

作者简介: 穆立彬(1993-),男,河北保定人,合肥工业大学硕士研究生,主要研究方向为流量计。Email:mulb2016@163.com

引用本文:

穆立彬,徐科军,刘博,田雷,李剑波,沈子文. 基于可变阈值和过零检测的四声道气体超声波流量变送器[J]. 计量学报, 2019, 40(2): 266-271.
MU Li-bin,XU Ke-jun,LIU Bo,TIAN Lei,LI Jian-bo,SHEN Zi-wen . Development of Four-channel Ultrasonic Gas Flow Transmitter Based on Variable Threshold and Zero-Crossing Detection. Acta Metrologica Sinica, 2019, 40(2): 266-271.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2019.02.15 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2019/V40/I2/266

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