Liquid crystal Fabry-Perot resonant cavity-based optical fiber hydrophone and manufacturing method thereof

A Poirot resonator and optical fiber hydrophone technology, applied in instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problem of low sensitivity and achieve the effects of increased acoustic sensitivity, easy structure, and loud sensitivity

Inactive Publication Date: 2019-02-12
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a fiber optic hydrophone based on a liquid crystal Fabry-Perot resonator and its manufacturing method in order to solve the problem of low sensitivity of the existing optical fiber Fabry-Perot hydrophone

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  • Liquid crystal Fabry-Perot resonant cavity-based optical fiber hydrophone and manufacturing method thereof
  • Liquid crystal Fabry-Perot resonant cavity-based optical fiber hydrophone and manufacturing method thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] A kind of optical fiber hydrophone based on the liquid crystal Fabry-Perot resonator of the present invention and preparation method thereof, comprise: design liquid crystal 10 to be filled between the end faces of two optical fibers, use the polydimethylsiloxane of making (PDMS) sleeve 8 and epoxy glue 14 for encapsulation. One of the optical fibers is coated with a high-reflection film, thereby forming a Fabry-Perot cavity on the end faces of the two optical fibers, and both end faces of the two optical fibers are subjected to light-controlled orientation treatment. The acoustic vibration signal is pressed onto the PDMS sleeve 8 through the polymethyl methacrylate (PMMA) sheet on the rear end surface of the reflective fiber, and the sleeve 8 is deformed laterally under the pressure, so that the length of the Fabry-Perot cavit...

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Abstract

The present invention provides a liquid crystal Fabry-Perot resonant cavity-based optical fiber hydrophone and a manufacturing method thereof. The liquid crystal Fabry-Perot resonant cavity-based optical fiber hydrophone comprises a sleeve, an incident optical fiber and a reflective optical fiber that are arranged in the sleeve, liquid crystals that are arranged in the incident optical fiber and the reflective optical fiber, and a thin plate. The thin plate is arranged at one end of the sleeve and is closely contact the reflective optical fiber, the end surface of the incident optical fiber isplated with a light-controlled alignment film, and the end surface of the reflective optical fiber is sequentially plated with a high-reflection film and a light-controlled alignment film. Accordingto the technical scheme of the present invention, the expansion and contraction of the polydimethylsiloxane sleeve is taken as the carrier of the acoustic vibration signal, and the Young's modulus with small PDMS (polydimethylsiloxane) can cause a large change of the Fabry-Biro cavity length, so that the structure has larger acoustic sensitivity; the Fabry-Bobro resonant cavity injected with liquid crystals is used to achieve the vernier effect, and the interference light intensity obtained in the case of the same value of pressure changes is more varied, so that the acoustic sensitivity of the hydrophone is increased; and it is easy to manufacture and implement the structure of the liquid crystal Fabry-Perot resonant cavity-based optical fiber hydrophone.

Description

technical field [0001] The invention relates to an optical fiber hydrophone and a manufacturing method thereof, in particular to an optical fiber hydrophone based on a liquid crystal Fabry-Perot resonant cavity and a manufacturing method thereof, belonging to the technical field of underwater acoustic detection. Background technique [0002] The energy propagation loss of electromagnetic waves and light waves in water is about three orders of magnitude larger than that of sound waves, and sound waves are an effective carrier that can transmit information over long distances in the ocean. A hydrophone is a sensor that detects, locates and identifies underwater targets by receiving sound waves. Traditional piezoelectric hydrophones require a large number of underwater electronic components and signal transmission cables, which have problems such as high price, complex structure, heavy weight, and poor sealing. In order to solve these problems, a large number of scholars have ...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/006
Inventor 刘永军付冬颖胡建阳孙伟民
Owner HARBIN ENG UNIV
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