Anti-acceleration optical fiber hydrophone probe device

An optical fiber hydrophone and acceleration technology, which is used in measurement devices, instruments, and ultrasonic/sonic/infrasonic measurements, etc., can solve the problems of complex structure and excessive volume, achieve small size, increase safety and reliability, and facilitate array integration. Effect

Active Publication Date: 2021-06-08
HARBIN ENG UNIV
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Problems solved by technology

Additional vibration damping components and complex packaging structure present certain shortcomings due to their large volume and complex structure

Method used

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  • Anti-acceleration optical fiber hydrophone probe device

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Embodiment 1

[0021] The purpose of the present invention is to utilize the advantages of optical fiber hydrophones, aiming at the limitations of existing optical fiber hydrophone probe structures, to propose a novel anti-acceleration optical fiber hydrophone probe structure device, effectively combining the advantages of the prior art, and solving the traditional The single advantage of the optical fiber hydrophone probe provides a strong guarantee for the sound pressure detection technology of the optical fiber hydrophone.

[0022] The hydrophone using the passive fiber grating or the active fiber grating as the sensing probe has a relatively simple structure, is more convenient for array integration, and has superior performance compared with the optical interference type hydrophone. The bare fiber grating is not sensitive to the sound pressure signal. In the structure of the hydrophone probe, the sound pressure sensitive elements such as the metal structure and the elastic diaphragm are ...

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Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly relates to an anti-acceleration optical fiber hydrophone probe device. Two metal elastic membranes are symmetrically fixed in the sound transmission metal sleeve, external sound pressure signals are transmitted to the fiber bragg grating through the two structures, axial stress is given to the two ends of a grating area of the fiber bragg grating, the central wavelength of reflected light of the fiber bragg grating is changed, and then underwater sound signals can be detected. The advantages of two structures of the damping element and the symmetrical strain gauge are effectively combined, the outer end cover and the inner end cover at the two ends of the probe are used for dual fixation, the safety and reliability during cable dragging are improved, and the device has the advantages of being small in size, simple in structure and convenient to apply in an array mode. The passive fiber bragg grating or the active fiber bragg grating is used as the hydrophone of the sensing probe, the structure is relatively simple, array integration is more convenient, and compared with an optical interference type hydrophone, the hydrophone has more excellent performance.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an anti-acceleration optical fiber hydrophone probe device. Background technique [0002] Optical fiber hydrophones are widely used in the field of underwater acoustic detection technology because of their advantages such as high sensitivity, wide response frequency range, anti-electromagnetic interference, and easy large-scale formation. They are especially suitable for long-distance and large-scale underwater monitoring. Most of the applications are in the form of dragging and dragging thin line arrays. In actual working conditions, axial vibration interference is often caused by tow cable jitter, turbulence changes, etc., especially axial acceleration has the greatest impact on the fiber optic hydrophone probe, so ensuring that the fiber optic hydrophone can resist axial acceleration is a guarantee It has the necessary prerequisites for high sound pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 田野仇成军马占宇段超谭滔刘祥和赵晓臣张建中
Owner HARBIN ENG UNIV
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