Piston type optical fibre grating sonic device

Abstract

The invention relates to the fiber sensor technical field and discloses a plunger type fiber raster hydrophone. The fiber raster hydrophone comprises a support cylinder, a protective sleeve, a first piston, a second piston and a fiber raster, wherein, the support cylinder is used as a main body of the hydrophone; the protective sleeve is sleeved on the surface of the support cylinder and used forprotecting the support cylinder and an inner structure of the support cylinder; the first piston and the second piston are symmetrically arranged inside the support cylinder and used for sensing pressure and producing displacement along the normal directions of the pistons under the action of the pressure; and the fiber raster for measuring underwater sound pressure is arranged inside the supportcylinder and runs through the first piston and the second piston. When the plunger type fiber raster hydrophone is utilized, the plunger type fiber raster hydrophone improves high-sensitivity and canoperate in different hydrostatic environments.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a novel piston-type optical fiber grating hydrophone. Background technique [0002] Compared with the corresponding conventional sensors, fiber optic sensors have obvious advantages in terms of sensitivity, dynamic range, and reliability. They are particularly prominent in the fields of national defense and military applications, and are listed as key national defense technologies by many countries. [0003] Optical fiber hydrophone is an instrument that detects signals such as pressure and sound in liquids by using the light transmission characteristics of optical fiber and various modulation effects generated by its interaction with the surrounding environment. Compared with traditional piezoelectric sensors, it has the following main advantages: wide frequency band, high sound pressure sensitivity, no electromagnetic interference, light weight, can be designed in...

AI Technical Summary

Problems solved by technology

The fiber optic pressure sensor manufactured in this way is easy to cause the fiber grating to chirp and bend due to the pressure of the fiber grating, which not only limits the sensitivity of the hydrophone, but also affects the detection of the signal

At the same time, the fiber grating hydrophone only relies on the polymer itself to resist static pressure, and the static pressure it can withstand is limited, so it is not suitable for working in a deep environment

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