| 连续波超声多普勒管道流量测量 |
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| 引用本文： | 罗守南,刘岩,冯冠平.连续波超声多普勒管道流量测量[J].仪表技术与传感器,2004(12):44-46. |
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| 作者姓名： | 罗守南 刘岩 冯冠平 |
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| 作者单位： | 1. 清华大学精密仪器与机械学系,北京,100084
2. 深圳清华大学研究院,广东,深圳,518057 |
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| 摘 要： | 介绍了一种采用连续波超声多普勒方法的管道流量测量系统。该系统在单片数字信号处理芯片上运用中频解调、选带傅立叶变换和加权平均频率估计等算法对连续波超声多普勒信号进行处理。解决了传统超声多普勒流量计在管道流量测量中遇到的低流速测量困难和无法判断流速方向等问题。
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| 关 键 词： | 超声多普勒 中频解调 选带傅立叶变换 加权平均 |
| 文章编号： | 1002-1841(2004)12-0044-03 |
| 修稿时间： | 2003年11月27 |
Continuous-wave Ultrasonic Doppler Method for Pipe-flow Measurements |
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| LUO Shou-nan,LIU Yan,FENG Guan-ping.Continuous-wave Ultrasonic Doppler Method for Pipe-flow Measurements[J].Instrument Technique and Sensor,2004(12):44-46. |
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| Authors: | LUO Shou-nan LIU Yan FENG Guan-ping |
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| Affiliation: | LUO Shou-nan~1,LIU Yan~2,FENG Guan-ping~2 |
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| Abstract: | Introduced a system for pipe-flow measurements based on continuous-wave(CW)ultrasonic Doppler method.To process the CW Doppler signal,intermediate-frequency(IF) demodulation,zoom FFT (Fast Fourier Transform)and weighted average algorithm for frequency evaluation were implemented in a single digital-signal-processing device.Thus we solved problems in conventional ultrasonic Doppler flowmeters such as hard to measure low velocity flow and decide the flow direction. |
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| Keywords: | Ultrasonic Doppler IF Demodulation Zoom FFT Weighted Average |
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