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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A 3-D PW ultrasonic Doppler flowmeter: theory and experimental characterization
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A 3-D PW ultrasonic Doppler flowmeter: theory and experimental characterization

机译：3-D PW超声多普勒流量计：理论与实验表征

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摘要

A complete 3-D ultrasonic pulsed Doppler system has been developed to measure quantitatively the velocity vector field of a fluid flow independently of the probe position. The probe consists of four 2.5 MHz piezocomposite ultrasonic transducers (one central transmitter and three receivers separated by 120/spl deg/) to measure the velocity projections along three different directions. The Doppler shift of the three channels is calculated by analog phase and quadrature demodulation, then digitally processed to extract the mean velocity from the complex spectrum. The accuracy of the 3-D Doppler technique has been tested on a moving string phantom providing an error of about 4% for both amplitude and direction with an acquisition window of 100 ms.
机译：已开发出完整的3-D超声脉冲多普勒系统，以定量测量流体流的速度矢量场，而与探头位置无关。该探头包含四个2.5 MHz压电复合超声换能器（一个中央发送器和三个接收器，以120 / spl deg /的距离分开）来测量沿三个不同方向的速度投影。通过模拟相位和正交解调来计算三个通道的多普勒频移，然后进行数字处理以从复频谱中提取平均速度。 3-D多普勒技术的准确性已在移动的琴弦幻象上进行了测试，在100 ms的采集窗口内，振幅和方向误差均约为4％。

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