Sound source directional sensing device with deep sub-wavelength size

Abstract

The invention discloses a sound source directional sensing device with deep sub-wavelength size. The sensing device is of a core-shell structure, the core is a rigid core, the shell is an acoustic super surface, a microphone is installed at the core-shell interface, the acoustic super surface comprises a plurality of folding slots distributed uniformly on the circumference, the folding slots are opened at one end away from the core and closed at the other end close to the core, and a ray defined by the center of the core and the center of the microphone penetrates through one of the openings by using the center of the core as a starting point. A bipolar morphology echo wall resonance mode formed under the interaction of the closed acoustic super surface and the incident plane wave intensity is skillfully utilized in the sound source directional sensing device with deep sub-wavelength size, so that a far-field sound source can be accurately and sensitively directed, and the sensing device does not produce obvious interference to the measured sound field and can form effective concealed protection.

Description

technical field [0001] The invention relates to an acoustic sensor, in particular to a deep sub-wavelength sound source directional sensing device. Background technique [0002] Traditional sound source directional devices, such as vector sensor devices and array sensor devices, respectively use particle vibration velocity measurement and multi-point measurement in the medium to achieve far-field sound source orientation. These devices have important applications in the field of sonar. For example, detecting the direction of an airborne or underwater acoustic vehicle. For example, the principle of the vector microphone is relatively complicated, not only the sound pressure needs to be measured, but also the particle vibration velocity in the medium needs to be further measured, so it is expensive; the array sensor device is huge and needs to be calibrated, and the sensing device is easy to be detected by the opponent's sonar. Contents of the invention [0003] Purpose of...

AI Technical Summary

Problems solved by technology

For example, the principle of the vector microphone is relatively complicated, not only the sound pressure needs to be measured, but also the particle vibration velocity in the medium needs to be further measured, so the price is expensive; the array sensor is huge and needs to be calibrated, and the sensing device is easy to be found by the opponent's sonar

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