Abstract
How to accurately calculate the sound field formed by acoustic lenses is an important basis for the design of acoustic lens transducers. The radiation sound field distribution of the physical model of acoustics lens is simulated by numerical methods, including the ray propagation method and the wave propagation method. The ray propagation method can only get the focal length without considering the wave characteristics property, while the wave propagation method takes into account the amplitude and phase factors of the wave, and by which the distribution of the whole sound field can be got. The relationship between the property of refractive wave and incident angle of incident wave is analyzed, and theoretical results of the distribution of the focal field are obtained. The actual sound field of the real transducer is measured by acoustic field scanning system, and the measured results of focal length and focal area are obtained. The comparison and analysis of the numerical data and measured data show that the wave propagation method can be used to predict the focus field of concave spherical acoustic lens transducer accurately and effectively.
Highlights
An acoustic lens transducer combined with a planar vibrating element and an acoustic lens can produce an effective focusing sound field
Acoustic lenses are usually arranged in a coaxial plane and a curved surface
How to accurately calculate the sound field formed by acoustic lenses is an important basis for the design of acoustic lens transducers
Summary
An acoustic lens transducer combined with a planar vibrating element and an acoustic lens can produce an effective focusing sound field. Under the mix method condition, the wave pressure at any place of the concave sphere surface is the same, and there is no difference in amplitude and phase This assumption is the same as the self-focusing concave spherical piezoelectric ceramics, and it is quite different from the actual situation of concave spherical acoustic lens focusing. Wave fluctuation is considered carefully in the whole process from vibrating element to the focus by wave method, that is, the refracted acoustic waves from the different places of the concave sphere surface of acoustic lens have different amplitude and phase. This is close to the actual situation and easy to realize. The purpose of this study is to verify the accuracy of the numerical method for calculating the focusing acoustic field of acoustic lens by the wave propagation theory, and to provide a predictive method for the design of acoustic lens transducer
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