A multifunctional experimental device based on the ultrasonic interference is developed.Based on the air medium,the experiments are designed to measure sound velocity by two-vibrator interferometry and to verify the half-wave loss.The sound velocity measurement experiment is carried out by means of interference field measurement and the interference fringe movement,and the sound pressure distribution of interference field is visualized by oscilloscope.The half-wave loss under grazing incidence is verified by using interference method,and the range of grazing incidence angle is estimated.Because of clear physical thinking,sufficient theoretical basis,obvious experimental phenomena,the interferometer is suitable for experimental teaching.
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