[1]王晓俊,周杏鹏,徐凯,等.基于改进相差法的超声波微流量检测[J].东南大学学报(自然科学版),2011,41(6):1202-1207.[doi:10.3969/j.issn.1001-0505.2011.06.015]
 Wang Xiaojun,Zhou Xingpeng,Xu Kai,et al.Ultrasonic micro-flow measurement based on improved phase-difference method[J].Journal of Southeast University (Natural Science Edition),2011,41(6):1202-1207.[doi:10.3969/j.issn.1001-0505.2011.06.015]
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基于改进相差法的超声波微流量检测()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
41
期数:
2011年第6期
页码:
1202-1207
栏目:
自动化
出版日期:
2011-11-20

文章信息/Info

Title:
Ultrasonic micro-flow measurement based on improved phase-difference method
作者:
王晓俊1周杏鹏1徐凯1刘威2
(1东南大学复杂工程系统测量与控制教育部重点实验室,南京 210096)
(2东南大学仪器科学与工程学院,南京 210096)
Author(s):
Wang Xiaojun1Zhou Xingpeng1Xu Kai1Liu Wei2
(1Key Laboratory of Measurement and Control of Complex Systems of Engineering of Ministry of Education,
Southeast University, Nanjing 210096, China)
(2 School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China)
关键词:
超声波流量计 相差法 微流量 鉴相器 时间分辨率 精度
Keywords:
ultrasonic flow-meter phase method micro-flow phase detector time resolution accuracy
分类号:
TP216
DOI:
10.3969/j.issn.1001-0505.2011.06.015
摘要:
针对传统超声波流量测量方法在微小流速工况下难以实现高精度测量的问题,提出一种基于计数器法与取样积分法相结合的改进相差法测量方法.首先采用高稳定性电子计数器实现整周期延迟相位粗测量,再基于取样积分原理实现剩余子相位的精细测量,通过增大取样积分次数抑制由抖动引起的相位差测量误差; 同时通过移相控制,消除传统鉴相器具有的不稳定工作区的影响.仿真与实验结果表明:在DN20管道、常温纯水条件下,微小流量下测量最大相对误差小于1%,中、大流量的测量最大相对误差小于0.5%; 在0.02m3/h微流量点的测量标准差为86cm3/h.改进相差法可实现比传统时差法更高的测量准确度和测量下限,有助于提高超声波在微流量条件下的检测性能.
Abstract:
To solve the precision measurement problem in micro flow condition of the conventional ultrasonic flow measurement method, an improved phase-difference method based on the combination of counter and sampling integration techniques is proposed. First, an electronic counter with high stability is adopted to realize the coarse measurement for whole cycle phase. And then the accurate measurement of sub-phase is achieved by using sampling integration technique which can greatly restrain the measurement error caused by jitter. At the same time, the dead zone of the phase detector can be eliminated by the phase shift control method. The simulation and experimental results show that under the condition of DN20 pipeline, normal temperature and pure water, the maximal relative error of micro flow measurement is less than 1%, while for medium and large flow measurements, the errors are both less than 0. 5%, and the standard deviation is 86cm3/h at 0. 02 m3/h flow point. The improved phase-difference method can achieve higher accuracy and lower limit than the conventional time-difference method. It is in favour of improving the ultrasonic testing performance in small flow condition.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介: 王晓俊(1975—),男,博士,讲师, impedance@seu.edu.cn.
基金项目: 江苏省产学研联合创新资金资助项目(BY2010140).
引文格式: 王晓俊,周杏鹏,徐凯,等.基于改进相差法的超声波微流量检测[J].东南大学学报:自然科学版,2011,41(6):1202-1207. [doi:10.3969/j.issn.1001-0505.2011.06.015]
更新日期/Last Update: 2011-11-20