Abstract：In view of the problem of acoustic multipath effect in circular array, a method of using the ring array with unequal spacing to destroy the coherence of each path is proposed to reduce the sidelobe performance and the interference of edge diffraction reflection. The simulation results show that the unequal spacing ring array can effectively reduce the side lobe of focused beam, and the optimal ring array structure is designed according to the simulation results. Finally, the acoustic field calibration experiment of the ring array is carried out in the experimental pool, the transducer array is excited by the pulse wave and the continuous wave at the frequency of 4~8kHz respectively. The results show that the axial sound pressure characteristics of the transducer can be accurately measured in the limited space by the method of pulse sinusoidal signal excitation.
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2020, Vol. 41 
