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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

Inactive Publication Date: 2013-02-27
NANJING NORMAL UNIVERSITY
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Problems solved by technology

However, this method is limited by the stability of polymer materials and special material structures. Its long-term work stability and repeatability are relatively poor, and it increases the size and load of FBG, and it is also difficult to use it stably for a long time.
[0006] In addition, there is an important technical problem in these two typical technical solutions, that is, there is a serious cross-sensitivity between lateral pressure and temperature, that is, the temperature change of the FBG will greatly affect the accuracy of pressure measurement

Method used

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

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Embodiment Construction

[0019] The light of the tunable laser 1 is input to the input APC interface 3.1 of the PDL tester 3 through the isolator 2, and then the polarization state of the laser is changed in a non-deterministic way through the built-in polarization controller 3.2 of the PDL tester 3 to make it Present all possible polarization states, and then output to the isolator 4 through another APC connector 3.3. The functions of the isolator 2 and the isolator 4 are to prevent the weak reflection of each node of the optical path in the sensing system from feeding back into the laser, causing The instability of the laser output leads to errors in the PDL measurement. Then the laser is input to the circulator 6 through the APC connector 5 coated with the refractive index matching paste, and an output port of the circulator 6 is connected to the APC connector 8 coated with the refractive index matching paste, and then connected to the FBG sensor 9, and the FBG sensor 9 Then input to the built-in p...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/30G01K11/32G01L1/24G01K11/3206
Inventor 汪弋平王鸣黄晓琴郝辉陶进
Owner NANJING NORMAL UNIVERSITY
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