Abstract：Based on laser holography, the near-field measurement method of low-frequency focusing transducer was researched, the basic principle of laser holography to measure near-field characteristics was analyzed, and a set of experimental measurement system was constructed. In order to verify the feasibility and accuracy of this method, the sound field of a focusing transducer composed of 25 piezoelectric columns arranged in 5*5 with a frequency of 80kHz and a self focusing acoustic lens on the surface was experimentally tested and calculated by using a laser vibrometer, and the sound pressure amplitude and phase distribution on the vibrating diaphragm 50mm away from the center of the radiation concave surface of the transducer were obtained.Using COMSOL model simulation and hydrophone test, the comparison verifies the high accuracy of the far-field extrapolation results after the laser holographic near-field measurement.
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2022, Vol. 43 
