| 基于互相关理论的超声波气体流量测量电路系统 |
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| 引用本文： | 桂永芳,傅新,鲍敏. 基于互相关理论的超声波气体流量测量电路系统[J]. 工业仪表与自动化装置, 2004, 0(2): 15-17,14 |
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| 作者姓名： | 桂永芳 傅新 鲍敏 |
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| 作者单位： | 浙江大学流体传动及控制国家重点实验室,浙江杭州,310027;浙江大学流体传动及控制国家重点实验室,浙江杭州,310027;浙江大学流体传动及控制国家重点实验室,浙江杭州,310027 |
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| 摘 要： | 介绍一种基于互相关理论的超声波流量测量电路系统。该系统以数字信号处理器(DSP)为核心，通过采集上、下游流动信号并做互相关运算，计算出互相关函数峰值对应的渡越时间，间接测出流量。采用抛物线插值计算互相关函数峰值，减少测量误差。它对流场不敏感，测量精度高，在气体的测量实验中，取得了比较理想的效果。
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| 关 键 词： | 数字信号处理器 超声波流量测量 互相关法 |
| 文章编号： | 1000-0682(2004)02-0015-03 |
An ultrasonic gas flow measurement circuit system based on the cross-correlation theory |
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| GUI Yong-fang,FU Xin,BAO Minhejiang University,Zhejiang-Hangzhou ,China). An ultrasonic gas flow measurement circuit system based on the cross-correlation theory[J]. Industrial Instrumentation & Automation, 2004, 0(2): 15-17,14 |
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| Authors: | GUI Yong-fang FU Xin BAO Minhejiang University Zhejiang-Hangzhou China) |
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| Affiliation: | GUI Yong-fang,FU Xin,BAO Minhejiang University,Zhejiang-Hangzhou 310027,China) |
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| Abstract: | An ultrasonic gas flow mesurement circuit system based on the cross-correlation theory is designed with DSP as its kernel.The up-stream and down-strean flow signals are sampled and cross-correlated.The flow velocity is indirectly measured through calculating the delay time in accordance with the cross-correlated peak.A parabola interpolation is used to reduce the measurement error.It is insensitive to a flow field.The gas experiment has shown its good result. |
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| Keywords: | Digital signal processing Ultrasonic flow measurement Cross-correlation |
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