High-sensitivity Fabry-Perot interferometer temperature sensor probe based on liquid crystal and the Vernier effect

A novel high-sensitivity Fabry-Perot (FP) interferometer temperature sensor based on liquid crystals (LCs) and the Vernier effect is proposed and demonstrated in this Letter. This sensor is prepared by inserting two cleaved single-mode fibers into a section of a capillary tube to generate an FP cavi...

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Bibliographic Details
Published in:Optics letters 2018-11, Vol.43 (21), p.5355-5358
Main Authors: Wang, Feiru, Liu, Yongjun, Lu, Yuelan, Zhang, Lingli, Ma, Ji, Wang, Lei, Sun, Weimin
Format: Article
Language:English
Subjects:
Appliance industry
Birefringence
Capillary tubes
Fabry-Perot interferometers
Liquid crystals
Refractivity
Sensitivity
Sensors
Temperature
Temperature sensors
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Summary:A novel high-sensitivity Fabry-Perot (FP) interferometer temperature sensor based on liquid crystals (LCs) and the Vernier effect is proposed and demonstrated in this Letter. This sensor is prepared by inserting two cleaved single-mode fibers into a section of a capillary tube to generate an FP cavity. The cavity is filled with LCs, which induces a Vernier effect due to the birefringence of LCs. The refractive indices of the ordinary and extraordinary light have different responses to the temperature changes. As a result, the temperature sensitivity is significantly improved by detecting the peak shifts of a periodic envelope. The experimental results show that the proposed sensor can provide a high-temperature sensitivity of 19.55 nm/°C. This sensor offers key features and advantages of the Fabry-Perot interferometer, including low cost and good fringe visibility. Furthermore, such a sensor probe can meet different requirements of temperature sensing in various application areas by using different kinds of LCs.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.43.005355