Chinese Optics Letters, Vol. 18, Issue 10, 101202 (2020)
High-sensitivity fiber liquid crystals temperature sensor with tiny size and simple tapered structure
Hai Zhang1, Jianyu Shang1, Xiujuan Liu1, Weimin Sun1, Feiru Wang2, and Yongjun Liu1,3,*
- 1Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
- 2School of Physics and Intelligent Manufacturing, Chifeng University, Chifeng 024000, China
- 3State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
This Letter presents a new type of optical fiber probe used to detect temperature, whose structure is very simple. The optical fiber probe is filled with cholesteric liquid crystals (CLCs) whose reflected light varies with temperature. The experimental results show that the proposed sensor can achieve a temperature sensitivity of 5.64 nm/°C in the temperature range of 18–40°C. The sensor has the advantages of simple structure, low cost, and easy mass manufacture. Its size is very tiny (the tapered structure, 125 μm in maximum diameter and <300 μm in length) and it is easy to integrate and measure. Meantime, the tapered structure of the probe is also ideal for measuring small samples such as cells and microfluidic channels, which will be a promising candidate for monitoring temperature fluctuations in small spaces.
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