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Sagnac interference temperature sensor based on liquid crystal-filled microstructure optical fiber

A technology of microstructured optical fiber and temperature sensor, which is applied in the direction of thermometers, thermometers, instruments, etc. with physical/chemical changes, can solve the problem that the interference wave trough wavelength and temperature do not meet the linear relationship, the average sensitivity of temperature measurement is low, and the interference of microstructured optical fibers is unfavorable. Sensing and other issues, to achieve the effect of a simple filling method

Inactive Publication Date: 2018-11-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many functional materials with a higher refractive index than quartz, such as nematic liquid crystal E7, etc., filling the air holes in the cladding of microstructured optical fibers will cause the core mode transmission mode to change from the refractive index-guided type to the bandgap type, which is not conducive to the realization of linearity, High-sensitivity micro-structured optical fiber Sagnac interference sensing
In 2012, YiFanZhang et al. connected the quartz-based microstructure fiber filled with liquid crystal E7 into the Sagnac interferometer, and the interference wave trough wavelength and temperature did not satisfy the linear relationship in the temperature range of 30-91 °C, and the average sensitivity of temperature measurement when the fiber length was 66mm Below 0.3nm / ℃

Method used

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  • Sagnac interference temperature sensor based on liquid crystal-filled microstructure optical fiber
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  • Sagnac interference temperature sensor based on liquid crystal-filled microstructure optical fiber

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Embodiment 1

[0031] exist figure 1 In the Sagnac interferometer optical path schematic diagram of the shown embodiment 1 of the present invention, the broadband laser source BBS outputs laser light to the 3dB coupler, and the 3dB coupler divides the light into two beams of linearly polarized light that propagate clockwise and counterclockwise, and the polarization controller PC rotates the polarization of two beams of linearly polarized light by 90 degrees. The SF57 microstructure optical fiber MOF completely filled with nematic liquid crystal E7 is connected to the Sagnac interference optical path. The parallel plate electrodes on both sides of the microstructure optical fiber and its power supply provide an electric field to make the liquid crystal molecules Oriented in the direction of the electric field, the spectrometer OSA measures the interference spectrum output by the 3dB coupler. exist figure 2In the schematic diagram of the structure of the microstructured optical fiber shown,...

Embodiment 2

[0036] Embodiment 2 of the present invention is basically the same as Embodiment 1, except that the diameter of the pores is increased to 2.4 μm, and the variation relationship of the interference trough in the first free spectral range with temperature is as follows Figure 6 shown. The interferometric trough in the first free spectral range approximately satisfies the linear relationship with the change of temperature, and the sensitivity of the temperature sensor of the interferometer is 14.6nm / K obtained by fitting the straight line.

Embodiment 3

[0038] Embodiment 3 of the present invention is basically the same as Embodiment 1, except that the pore diameter is increased to 2.8 μm, and the relationship between the interference trough in the first free spectral range and the temperature is as follows Figure 6 shown. The interferometric trough in the first free spectral range approximately satisfies the linear relationship with the change of temperature, and the sensitivity of the temperature sensor of the interferometer is 13.5nm / K obtained by fitting the straight line.

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Abstract

The invention discloses a Sagnac temperature sensor based on a liquid crystal-filled microstructure optical fiber, which comprises a broadband light source BBS, a 3dB coupler, a polarization controller PC, a microstructure optical fiber MOF, flat electrodes and a power supply thereof and a spectrometer OSA, wherein the broadband light source BBS outputs laser to the 3dB coupler; the 3dB coupler equally divides the laser to a beam of clockwise-propagated light and a beam of anticlockwise-propagated light; the polarization controller PC polarizes and rotates linearly polarized light for 90 DEG,an SF57 microstructure optical fiber MOF with nematic liquid crystal E7 completely filled is connected to a Sagnac interference optical path, the parallel flat electrodes at two sides of the microstructure optical fiber and the power supply thereof provide an electric field to enable liquid crystal molecules to be oriented along the electric field direction, and the spectrometer OSA measures the interference spectrum outputted by the 3dB coupler. Through changing optical fiber structure parameters such as the size of an air hole, the air hole gap and the length of the optical fiber, the temperature measurement interference wavelength range and the sensitivity can be adjusted.

Description

technical field [0001] The invention relates to a Sagnac interference temperature sensor filled with liquid crystal microstructure optical fiber. The Sagnac interference temperature sensor can be used for high-sensitivity temperature measurement and belongs to the technical field of optical fiber sensing. Background technique [0002] Due to the advantages of immunity to electromagnetic waves, high sensitivity, corrosion resistance, and easy remote control, optical fibers are used to measure and monitor changes in physical quantities. By modifying the traditional optical fiber, such as polishing the optical fiber into a D-shaped structure or making a grating by periodic irradiation of ultraviolet light, the coupling between the transmission mode of the fiber core and the defect transmission mode covered in the external field sensitive material around the fiber can be enhanced. , to realize the measurement of the external physical field. [0003] The presence of cladding air...

Claims

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Application Information

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IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 陈海亮马明建李曙光井西利李建设刘英超
Owner YANSHAN UNIV
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