基于近场声全息的聚焦换能器声场测量方法研究

高强度聚焦超声(HIFU)被广泛应用于医疗领域,但聚焦换能器焦点处的声强比较大,直接测量容易造成水听器损坏.为了间接获得焦点处声压,将全息测量面近似等效为声源面,结合空间傅里叶变换算法,提出了一种高测量效率的聚焦换能器声场测量方法.以球面自聚焦换能器为对象,进行声场测量方法的仿真研究和实验验证.结果表明,该方法比积分法...

Research on Sound Field Measurement Method of Focusing Transducer Based on Near-field Acoustic Holography

High-intensity focused ultrasound (HIFU)is widely used in the medical field, but the intensity at the focus of the focused transducer is relatively large, and direct measurement is likely to cause damage to the hydrophone. In order to obtain the sound pressure at the focus indirectly, the holographic measurement surface is approximately equivalent to the sound source surface and combined with the space Fourier transform algorithm, a high-efficiency focused transducer sound field measurement method is proposed. The spherical self-focused transducer is used as the object to carry out simulation research and experimental verification of the sound field measurement method. The results show that the proposed method is twice as efficient as the integral method and the measurement error is kept within the effective range. This method can be effectively used for the focused transducer sound field measurement.