Sound pressure monitoring device of ocean background noise

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.