Hydrostatic pressure resistant optical fiber hydrophone based on piston

Abstract

The invention provides a hydrostatic pressure resistant optical fiber hydrophone based on a piston, and the optical fiber hydrophone comprises a cylindrical rigid cylinder, a corrugated pipe, a piston cavity, a piston system, a communication hole, a diaphragm chamber, a sound-sensitive diaphragm, and an optical fiber grating. A plurality of evenly-arranged piston cavities are formed in the rigid cylinder in the axis direction, the corrugated pipes are arranged at one ends in the piston cavities, the piston system is connected with the corrugated pipes through piston connecting rods, and hydrostatic pressure resisting compensation is achieved. The piston cavity is connected with the diaphragm chamber through the communicating hole, and a diaphragm is arranged at the outer end of the diaphragm chamber; a fiber bragg grating is installed at the inner axis of the rigid cylinder, one end of the fiber bragg grating is connected with the sound-sensitive diaphragm, and the other end of the fiber bragg grating is connected with a pre-tightening device in the rigid cylinder. According to the invention, high sensitivity and static pressure balance are realized on a small volume; and the corrugated pipe structure can be used for buffering and protecting the hydrophone.

Description

technical field [0001] The invention relates to an optical fiber hydrophone, in particular to a piston-based hydrostatic pressure-resistant optical fiber hydrophone, which belongs to the technical field of optical fiber sensors. Background technique [0002] Optical fiber hydrophone is an instrument that detects sound in water by using the light transmission characteristics of optical fiber and the modulation effect generated by the sound pressure of the surrounding environment. At present, fiber optic hydrophones mainly include intensity modulation type, interference type, fiber grating type, etc. Fiber grating type hydrophones have advantages such as high sensitivity, small size, and easy wavelength division multiplexing. There are broad application prospects in fields such as rapid warning of ports. [0003] Since the fiber grating hydrophone is a wavelength-sensitive sensor, the wavelength of the fiber grating changes with the pressure, and the fiber grating hydrophone ...

AI Technical Summary

Problems solved by technology

This kind of hydrophone has a complex structure, low reliability, large airbag volume, and is easily damaged in a complex underwater environment, which greatly reduces the reliability of the hydrophone and is not conducive to the miniaturization of the hydrophone structure (References , Steven Goodman, Alexei Tikhomirov, Scott Foster. Pressure compensated distributed feedback fiber laserhydrophone [P]. International Conference on Optical Fiber Sensors, 2008.)

Images