System capable of synchronously measuring transverse pressure and temperature of fiber grating based on polarization measurement

A technology of optical fiber grating and transverse pressure, which is applied in the measurement of the change force of the optical properties of the material when it is stressed, the measurement of heat, and the thermometer with physical/chemical changes, etc., which can solve the problems of long-term work stability and poor repeatability, Difficult long-term stable use, limited stability and other issues, to achieve the effect of good long-term temperature reliability, simple structure and high sensitivity
CN102944253AInactive Publication Date: 2013-02-27NANJING NORMAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING NORMAL UNIVERSITY
Publication Date
2013-02-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a fiber grating sensing system capable of simultaneously measuring transverse pressure and temperature based on polarization measurement, and belongs to the field of optical fiber sensing. The fiber grating sensing system mainly comprises a tunable laser with high stability, an optical isolator, an optical circulator, a Bragg fiber grating, a polarization-dependent loss tester and a spectrum analyzer. When the fiber grating is subject to the simultaneous action of transverse pressure and temperature, the polarization-dependent loss property of the transmission end obviously changes due to the dual-deflection effect, and the size of the transverse pressure can be demodulated through the measurement of the polarization-dependent loss tester. The reflective light of the fiber grating is inputted to the spectrum analyzer through the optical circulator, and the temperature is measured by analyzing the movement of the center wavelength of the reflective light spectrum. The fiber grating sensing system has the advantages that the dual parameters of the transverse pressure and the temperature can be simultaneously measured, the sensitivity is high, the structure is simple, and the full-light sensing is realized.
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Description

technical field

[0001] The invention relates to a fiber grating sensor system based on polarization measurement that can simultaneously realize the functions of lateral pressure and temperature measurement, and belongs to the field of fiber sensor. Background technique

[0002] In recent years, fiber Bragg gratings (FBGs) have received more and more attention in the field of sensing. The basic working principle of the FBG sensor is that when the FBG is affected by temperature and strain, the drift of its central wavelength changes linearly, and the information of physical parameters such as temperature and strain can be restored by detecting the movement of the wavelength. Compared with traditional electrical sensors, FBG sensors have the following technical advantages: 1. It is not subject to electromagnetic wave interference and has strong corrosion resistance. In view of its wavelength absolute encoding characteristics, it will not be affected by light source fluctuation...

Claims

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