利用超声多普勒流速仪（ADV）对反向流动中圆射流流动特性进行了试验。
The flowing characteristics of a round turbulent jet in counter flowing ambientce are studied by using Acoustic Doppler Velocimeter (ADV) measurement techniques.
超声血流仪实现其测量血流速度的关键是多普勒频移信号的提取，多普勒频移信号是血流速度的真实反映。
As Doppler shift signal can significantly reflect the speed of flow, the abstracting of Doppler shift signal is the key of blood flow speed testing in a ultrasonic blood flow detector.
目的探讨不同彩色多普勒超声诊断仪对流速测定的可能影响，以及不同仪器测定流速与实际流速的差异和相关性。
Objective To evaluate the probable effects of different instrumentation in velocity measurements and the correlations between the actual flow velocities and the Doppler flow velocity.
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