Point sound source sounding device and sounding method

Abstract

The invention discloses a point sound source sounding device and sounding method. The device comprises a laser generator, a pulse laser head arranged at a laser outgoing port of the laser generator, and a laser focusing lens located on an optical path of the pulse laser emitted from the pulse laser head; a light spot that can break through air is formed by focusing the pulse laser, the light intensity of the light spot is greater than a threshold of the light intensity generated by a plasma, when the air is broken down, a small plasma explosion with rapid expansion characteristics is generated, the expanded plasma produces a pressure pulse with a short and high peak, the frequency of the pressure pulse can exceed 100kHz, the pressure pulse propagates as a nonlinear supersonic shock wave near a breakdown point, and the propagation speed of the shock wave is determined by the energy released when the air is broken down; and for the laser pulse energy in an mJ energy range, the shock waveis rapidly attenuated into a sound wave, and thus a point sound source with sufficient sound pressure and spatial omnidirectionality can be obtained, and the point sound source is repeatable.

Description

technical field [0001] The invention relates to a point sound source sounding device and a sounding method. Background technique [0002] When conducting acoustic tests such as reverberation time measurement in reverberation chambers and point sound source localization of microphone arrays, it is usually desirable to obtain an ideal acoustic system impulse response. But an ideal acoustic system impulse response can only be achieved if the sound source and receiving transducers have point-like and functional responses. For receiving sensors, it is relatively easy to achieve point-like functional response characteristics, but it is difficult to obtain a true point sound source. [0003] In practical applications, point sound sources are usually approximated by ignoring the size of the sound source and assuming that the sound source is sufficiently omnidirectional. In practice, however, most signal sources are not omnidirectional enough to produce an inaccurate estimate of th...

AI Technical Summary

Problems solved by technology

At present, there is no real point sound source sounding method and sounding device that can be used for acoustic measurement and calibration, and has a very small physical size and can be approximated as a spatial point.

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