超音波の非線形効果を利用した気体の流速分布計測法

抄録

In this paper a new method for measurement of gass flow vector's distribution across a desired line is proposed.
A contineous low intensity high frequency probing ultrasonic wave is propagated along the line and an impulsive high pressure pumping ultrasonic wave is emitted from the opposite direction and the flow velocity of the gass at each point on the line is observed by utilizing the nonlinear interaction of the pumping ultrasonic wave and the medium with proper signal processings.
The principle and some experimental results are presented. The results clearly show the effectiveness of the proposed method.
The special features of the method are 1) no need of any special seeds which are required in ultrasonic or laser doppler method, 2) the measurement can be done only by the transducers arranged at both ends of the observing line.