期刊
IEEE SENSORS JOURNAL
卷 21, 期 21, 页码 24157-24165出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3113834
关键词
Temperature sensors; Sensors; Sensitivity; Glass; Chalcogenides; Optical fiber sensors; Chlorine compounds; Chalcogenide photonic crystal fiber; Sagnac interferometer; temperature sensor
A novel Sagnac interferometer based temperature sensor using chalcogenide photonic crystal fiber was proposed, with the cladding air holes filled with a highly temperature sensitive liquid to enhance sensitivity. Numerical analysis showed that full infiltration outperformed partial infiltration, achieving high linearity sensing dips and broad detection window suitable for various applications like fingerprint unlocking and MIR radiation detection.
In this paper, a novel Sagnac Interferometer (SI) based chalcogenide Photonic Crystal Fiber (PCF) temperature sensor is theoretically and numerically analyzed operating in the mid infrared (MIR) region. The PCF cladding air holes are proposed to be filled with a highly temperature sensitive liquid chloroform to enhance the temperature sensitivity. The temperature sensing characteristics of three different infiltration technique is investigated theoretically and compared by Finite Element Method (FEM). Simulation results show that full infiltration performs better than partial infiltration. In the numerical analysis two sensing dips with high linearity is achieved for full infiltration which shows sensitivity of -5.77 nm/degrees C and 8.49 nm/degrees C when the temperature increases from 25 to 85 degrees C for the specific fiber length of 1.532 mm. The R-2 values are 0.957446809 and 0.97680771 for the respective two sensing dips. The proposed highly sensitive sensor has broad detection window which can be applied in fingerprint unlocking, MIR radiation detection in human body, biomedicine applications, and environmental temperature monitoring.
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