Sound pressure monitoring device of ocean background noise

Abstract

The invention discloses a sound pressure monitoring device of ocean background noise. The device comprises an optical path system, a control system and a power supply system, wherein the optical path system comprises a laser device, a semi-transmission semi-reflection spectroscope, a plane mirror, a vibrating reed with a reflecting surface and a photoelectric receiver; a varying interference pattern is formed on the photoelectric receiver according to the deformation of the vibrating reed; the control system comprises a controller and two piezoelectric ceramics mounted on the plane mirror; onone hand, the controller outputs a modulation signal to drive the first piezoelectric ceramics to shake so as to judge the deformation direction of the vibrating reed; and on the other hand, the controller outputs compensation voltage to drive the second piezoelectric ceramics to deform so as to track the deformation amount of the vibrating reed, thereby obtaining the sound pressure of the ocean background noise by conversion. In the sound pressure monitoring device of ocean background noise, disclosed by the invention, the structural design of the optical path system is performed by use of the Michelson interference principle; and the device has high precision, good linearity and good frequency response characteristics while preventing attenuation at a low-frequency signal segment.

Description

technical field [0001] The invention belongs to the technical field of underwater monitoring devices, and in particular relates to a device for monitoring sound pressure signals of background noise in the ocean. Background technique [0002] Studying the characteristics and models of the ocean background noise field can invert the movement process of the ocean, understand the behavior of marine animals, and then help to identify underwater targets, evaluate sonar performance, and study underwater acoustic countermeasures. With the development of modern industrial production, ocean shipping, and fishery, the characteristics of ocean background noise have become more complex, which also puts forward higher requirements for ocean noise monitoring. [0003] Traditional sound pressure monitoring devices used to detect underwater noise are mostly based on piezoelectric, capacitive, and magnetoelectric measurement principles, which have shortcomings such as nonlinearity, narrow ban...

AI Technical Summary

Problems solved by technology

[0003] Traditional sound pressure monitoring devices used to detect underwater noise are mostly based on piezoelectric, capacitive, and magnetoelectric measurement principles, which have shortcomings such as nonlinearity, narrow bandwidth, and rapid signal sensitivity degradation especially in low frequency bands.

The low-frequency band is the main frequency band in the research field of modern ocean background noise and target recognition, so the existing sound pressure monitoring device cannot well meet the accurate monitoring requirements of the sound pressure intensity of ocean background noise

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