Visualization Of The Effect Of Sound Field In Heterogeneously Homogeneous Media And Its Application Research

Due to the advantages of high frequency,concentrated energy,less diffraction,no erosion,good directivity and beam ability at a certain distance,ultrasonic is widely used in nondestructive testing and medical diagnosis.The understanding of the process of ultrasonic propagation in media,including the generation of ultrasonic wave and the change of ultrasonic state at the discontinuity of media,and the visualization of this process are of great value to the applications of ultrasonic.Firstly,the influences of the ultrasonic frequency and the size of the ultrasonic transducer on the sound pressure distribution in the process of propagation were simulated based on MATLAB in this paper.It was found that the above parameters have an important influence on the concentration and intensity of the sound field energy.Secondly,simulations based on different homogeneous media and media with different phases were carried out to explore the ultrasonic attenuation and scattering caused by different phases in the media.Then,optical polarization imaging method was used to visualize the ultrasonic wave.The optical path for sound field visualization was built based on polarization modulation imaging method,and the continuous and transient sound fields were visualized.Results showed that the polarization parameter of light field is highly sensitive to ultrasonic pressure.In conclusion,the optical polarization imaging method has the advantages of non-invasive measurement,fast measurement speed,transient imaging of sound field and high contrast of visual image of sound field,which has a certain significance for the understanding of propagation of sound wave and the interaction with media.Finally,the prospections of the method for visualizing the ultrasonic propagation involved in this paper was proposed,and ways for system’s further improvement were also proposed.