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阻抗匹配抑制时差式气体超声波流量计零漂 预览

Restraining Zero Drift of Time-Difference Gas Ultrasonic Flowmeter by Impedance Matching
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摘要 时差式气体超声波流量计在测量时现会出现零漂过大的问题,导致整体系统计量准确度不高。针对这种情况,提出了一种通过匹配流道中同一探头在发射状态下的输入阻抗和接收状态下的输出阻抗来抑制零漂的方法。利用贴片电容抬高信号激励端的阻抗,使之脱离与地虚短的状态,避免同一探头在发、收状态切换时的电路结构变化。保持探头谐振频率不变,使超声波探头发收电路固有延时在顺、逆流测量时相等。利用互相关法使顺逆流信号中固有延时相互抵消,实验结果表明,阻抗匹配有效抑制了零漂,20℃时零点误差被抑制在0.00048m3/h内,符合1.5级气体流量计国家标准。 In flow measurement the zero drift of time-difference ultrasonic gas flowmeter would be too high,decreasing measurement accuracy of the whole system.Aiming at this occurrence,a method that restrains zero drift by matching the input impedance of sensor in transmitting state and the output impedance of the same sensor in receiving state in the channel is proposed.Use chip capacitors to raise the impedance of signal stimulation port,disengaging it from virtual ground state.Therefore,preclude the same sensor from circuit structure variation with upstream and downstream swapping.Keep the resonance frequency of the sensor unchanged.So the inherent delay of transmitting-receiving circuit of ultrasonic sensors are equal in upstream and downstream measurement.Utilize cross-correlation method to make the inherent delay in upstream and downstream cancelled out.Practical measurement shows that impedance matching effectively restrains zero drift,and zero error is restrained below 0.000 48 m 3/h at 20℃,conforming with grade 1.5 Gas Flowmeter National Standard.
作者 郑晓宇 杨鸣 金定飞 聂西利 ZHENG Xiaoyu;YANG Ming;JIN Dingfei;NIE Xili(College of Information Science & Engineering,Ningbo University,Ningbo Zhejiang 315212,China;Zhejiang Tianxin Ultrasonic Technology Co,.Ltd,Hangzhou 310016,China;Jinka High Science & Technology Co.,Ltd,Hangzhou 310016,China)
出处 《传感技术学报》 CAS CSCD 北大核心 2019年第1期36-42,共7页 Journal of Transduction Technology
关键词 气体超声波流量计 零漂 零点误差 阻抗匹配 ultrasonic gas flowmeter zero drift zero error impedance match
作者简介 郑晓宇(1993-),男,在读研究生,主要研究方向为电子系统设计与开发,气体超声波流量计,281236317@qq.com;杨鸣(1963-),男,研究员,1987年毕业于西北工业大学获硕士学位。主要研究方向为光机电一体化专业设备制造技术,显微镜数字成像及处理技术,气体超声波流量计,yangming@nbu.edu.cn。
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  • 1王彦芳,王小平,张翠肖,井海明.高精度超声波流量计的设计[J].传感器与微系统,2006,25(8):40-42. 被引量:7
  • 2陈玲.新型流量测量仪表的应用和发展[J].传感器与微系统,2007,26(6):8-11. 被引量:14
  • 3YODER. The Market for Ultrasonic Flowmeters Worldwide[ R] . Massachusetts, USA, 2005. 被引量:1
  • 4SANDERSON, HEMP. Ultrasonic Flowmeters-A Review of the State of the Art [ C ]//International Conference on Advances in Flow Measurement Techniques. 1981:157 - 178. 被引量:1
  • 5LYNNWORTH. Ultrasonic Measurements for Process Control: Theory, Techniques, Applications [ M ]. San Diego : Academic Press, 1989 : 111 - 243. 被引量:1
  • 6DIMITRIJEVIC, PAVLVIC. Ultrasonic Fluid Flow Measurement Methods, An Overview[ J]. Facta Universitatis (NIS) Series: Electronics and Energetics, 1995,8 ( 2 ) : 299 - 315. 被引量:1
  • 7LYNNWORTH, LIU Yi. Ultrasonic Flowmeters Half-century Progress Report 1955-2005 [ J ]. Ultrasonics, 2006, 44 (1):1371 -1378. 被引量:1
  • 8EREN. Accuracy in Real Time Ultrasonic Applications and Transit-Time Flow Meters [ C ]//IEEE Instrumentation and Measurement Technology Conference. 1998:568 -572. 被引量:1
  • 9ERIKSSON H,BORJESSON P O,ODLING P,et al. A Robust Correlation Receiver for Distance Estimation[ J]. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1994,41 ( 5 ) :596 - 603. 被引量:1
  • 10LIU Yan-ping, LIU Xing, NAN Jing, et al. Design and Implementation of AGC in Gas Ultrasonic Flowmeter [ C]//IEEE 8th International Conference on Electric Measurement and Instruments. 2007:534 -537. 被引量:1

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