Sound wave detector and system based on acousto-optic effect

Abstract

The invention relates to a sound wave detector and system based on the acousto-optic effect and particularly relates to the field of sound wave detection. When the sound wave detector detects sound waves, the sound wave detector is arranged under an illumination condition, a semiconductor layer is made of an acousto-optic material, so the optical refractive index of the semiconductor layer can bechanged under the action of sound waves, furthermore, coupling between the first metal layer and the second metal layer is changed, so resonance wavelength between the first metal layer and the secondmetal layer is changed, through the change of the resonance wavelength between the first metal layer and the second metal layer and the corresponding relation between the changed resonance wavelengthand the sound waves, the sound waves to be measured can be directly obtained, as the sound waves are characterized through optical resonance, loss of the sound waves can be reduced, and measurement of the sound waves is more accurate.

Description

technical field [0001] The invention relates to the field of acoustic wave detection, in particular to an acoustic wave detector and system based on the acousto-optic effect. Background technique [0002] The propagation of the vibration generated by the sounding body in the air or other substances is called sound wave. Sound waves propagate in all directions by means of various media. Sound waves are usually longitudinal waves, and the particles where the sound waves go vibrate near the equilibrium position along the direction of propagation. The propagation of sound waves is essentially the transfer of energy in the medium. [0003] In the prior art, the detection of sound waves mainly relies on the detection of the energy carried by the sound waves. The device used is generally an energy measurement device. A general energy measurement device converts an acoustic signal into an electrical signal, and through the measurement of the electrical signal And the corresponding...

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Problems solved by technology

[0005] The object of the present invention is to provide an acoustic wave detector and system based on the acousto-optic effect in view of the deficiencies in the above-mentioned prior art, so as to solve the problem of relatively large losses when converting sound into electrical signals in the prior art. Problems that make measurements of sound waves inaccurate

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