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Fiber-Optic Temperature Sensor Using Cholesteric Liquid Crystals on the Optical Fiber Ferrules
Soyeon Ahn1, Gi Hyen Lee1, Jun-Yong Lee1
1Department of Physics, College of Natural Sciences, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea.
Sensors (Basel, Switzerland)
|August 12, 2022
Summary
This study presents a novel cholesteric liquid crystal (CLC) device for optical fiber temperature sensing. The CLC sensor demonstrates reversible, linear temperature response, enabling precise measurements.
Area of Science:
- Materials Science
- Optoelectronics
- Sensor Technology
Background:
- Cholesteric liquid crystals (CLCs) exhibit stimulus-responsive alignment, making them suitable for sensor applications.
- Traditional CLC sensors often face challenges in integration and sensitivity.
Purpose of the Study:
- To develop a novel optical fiber temperature sensor utilizing a CLC device.
- To investigate the performance and characteristics of the CLC-based sensor for temperature monitoring.
Main Methods:
- Fabrication of a CLC device with vertically aligned helical axes between optical fiber ferrules.
- Utilizing a wideband wavelength-swept laser to measure reflection spectrum variations with temperature.
- Analyzing changes in reflection spectrum band, bandwidth, refractive indices, and pitch.
Main Results:
- Successful implementation of an optical fiber temperature sensor.
- Reversible and linear relationship between wavelength variation and temperature (-5.0 nm/°C).
- Temperature-induced decrease in reflection spectrum bandwidth (-1.89 nm/°C) and pitch.
Conclusions:
- The proposed CLC device offers a robust platform for optical fiber temperature sensing.
- The sensor exhibits predictable and quantifiable responses to temperature changes.
- This technology has potential for advanced temperature monitoring applications.
