A Continuous Ultrasonic Signal Method of Laser-Ultrasonic Technique for Flow Field Measurements

摘要

One new kind of the laser-ultrasonic technique in which a continuous ultrasonic signal is used to record flow-induced traveling time differences of ultrasonic wave, propagating along a measuring sound beam between two laser beams, so-called A Continuous Ultrasonic Signal Method of Laser-Ultrasonic Technique, is presented. This method allows a fast and non-disturbing exploration of the flow field around models in wind tunnels. By using the new method, even an ultrasonic transducer with lower performance could be employed, and there is no need a high-accuracy optical detector.