...河仪器 播时间法超声流量计（transit time ultrasonic flowmeter，TTUF），多普勒法超声流量计（doppler ultrasonic flowmeter，DUF），相关法超声流量计（cross correlation ultrasonic flowmeter，C..
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以多普勒法的谷物收获超声波流量计为研究对象，进行谷物收获系统和超声波流量计的前期研究。
We research corn harvest system of ultrasonic flowmeter by Doppler in this paper, start the prophase research work on corn harvest system and ultrasonic flowmeter.
本文阐述了超声波流量计常用的时差法、多普勒法的测流原理，以及超声波流量计的分类。
This paper explained the commonly used principle of ultrasonic flow meter: time-difference method and Doppler method and introduced the classification of the ultrasonic flow meter.
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