Optical device and method for simultaneous observation of internal sound fields of transparent fluid and transparent solid

Abstract

The invention discloses an optical device and a method for simultaneous observation of internal sound fields of a transparent fluid and a transparent solid. Circular polarized light is formed by a polarizer and a 1 / 4 slide to pass through the sound fields, and light with information of the internal sound fields of the transparent fluid and the transparent solid is split into two beams by an optical light splitter, wherein one of the beams passes through a convergent lens to be subjected to spatial filtering and imaging and is used for observing the sound field in the fluid, and the other beam passes through the 1 / 4 slide and a polarization analyzer to obtain an image of the sound field in the solid by imaging. Therefore, non-invasive imaging of the internal sound fields of the transparent fluid and the transparent solid can be realized at the same time, and observation of the internal sound fields of the transparent fluid and the transparent solid is realized. Instantaneous sound field states as well as continuous sound field dynamic changes can be obtained, more accurate and comprehensive information of the internal sound fields of the transparent fluid and the transparent solid are provided, propagation characteristics of the sound fields in liquid and solid interfaces can be observed, and the optical device and the method can be applied to acoustic method based liquid and solid interface wave detection for further research and teaching of material characteristics.

Description

technical field [0001] The invention belongs to the field of ultrasonic technology, in particular to an optical device and method for simultaneously observing the internal sound field of transparent fluid and transparent solid. Background technique [0002] The imaging and measurement of the sound field are widely used in ultrasonic testing and ultrasonic medical treatment, including the research process of ultrasonic testing methods. It is necessary to know the change of the sound field in the fluid and solid over time after the ultrasound is incident on the liquid-solid interface, so the same moment can be obtained. The distribution of sound waves in fluids and solids and their variation with time are of particular importance. [0003] Traditional measurement methods have certain limitations, common measurement methods are: [0004] (1) Hydrophone method: It is suitable for the measurement of sound fields in various fluids. However, this method is an intrusive measuremen...

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Problems solved by technology

However, this method is only suitable for the measurement of low-frequency ultrasonic fields below 50KHz in fluids, and the quantitative measurement of high-frequency sound fields above 0.3MHz is difficult

[0009] (6) Photoelastic method: use the photoelastic effect in transparent solids to observe the sound field and its dynamic changes in transparent solids, but the sound field in transparent fluids cannot be observed at the same time, and the sound field distribution in fluids and solids at a certain moment cannot be obtained at the same time picture

[0010] (7) Schlieren method: use the piezo-optical effect in transparent fluid to observe the sound field in transparent fluid and its dynamic changes, but the sound field in transparent solid cannot be observed at the same time, and the sound field distribution map in fluid and solid at a certain moment cannot be obtained at the same time

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