研究目的
To propose and investigate a highly sensitive temperature sensor based on a Sagnac interferometer with liquid crystal photonic crystal fibers.
研究成果
The designed temperature sensor achieves high sensitivity (up to 18 nm/K) and good resolution (down to 5.6E-4 K) in the range of 290–320 K. Optimization of PCF parameters (e.g., duty ratio) can enhance performance. The sensor shows promise for applications requiring precise temperature measurement, with tunability via fiber length and structure adjustments.
研究不足
The study is based on simulations (FEM), not experimental validation. The temperature range is limited to 290–320 K due to LC properties. Sensitivity and range trade-off exists; higher sensitivity in FSR II has narrower range. Fabrication challenges for PCF with specific parameters may arise.
1：Experimental Design and Method Selection:
The study uses finite element method (FEM) simulations to design and analyze the temperature sensor. A Sagnac interferometer is employed with a liquid crystal (LC E7) infiltrated photonic crystal fiber (PCF) made of lead silicate glass (SF57). The PCF is designed to be anisotropic under an electric field due to LC infiltration, and its birefringence is utilized for temperature sensing.
2：7). The PCF is designed to be anisotropic under an electric field due to LC infiltration, and its birefringence is utilized for temperature sensing. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The PCF structure is defined with parameters such as air hole pitch (Λ) and diameter (d). LC E7 is selected for its anisotropic properties and temperature-dependent refractive index. Data on refractive indices of materials are sourced from literature.
3：List of Experimental Equipment and Materials:
Broadband light source (BBS), 3 dB coupler, polarization controller (PC), PCF with LC E7 infiltration, electrodes for electric field application, optical signal analyzer (OSA). Materials include SF57 glass, LC E
4：Experimental Procedures and Operational Workflow:
Light from BBS is split by a 3 dB coupler into counter-propagating waves. PC rotates polarization. Waves pass through the PCF, where birefringence causes phase difference. Interference occurs at the coupler output, measured by OSA. Temperature changes affect LC refractive index, shifting interference spectrum.
5：Data Analysis Methods:
FEM simulations using COMSOL software to compute mode indices and birefringence. Phase difference and output power are calculated. Sensitivity and resolution are derived from wavelength shifts with temperature.
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Broadband light source
BBS
Outputs laser light into the interferometer for the sensing setup.
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3 dB coupler
Splits input optical light equally into two counter-propagating waves in the Sagnac interferometer.
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Polarization controller
PC
Rotates the polarization direction of linearly polarized light by 90 degrees.
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Optical signal analyzer
OSA
Measures the output power of the interferometer to detect wavelength shifts.
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COMSOL software
COMSOL
Used for finite element method simulations to compute propagating characteristics of the PCF.
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Liquid crystal
E7
Infiltrated into PCF cladding air holes to induce anisotropy and thermal sensitivity for temperature measurement.
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Photonic crystal fiber
Core component made of SF57 glass, with LC infiltration to create birefringence for sensing.
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