Miniature fiber-optic temperature sensor based on optical coating interference

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• 作者：Xiaodan Gao<sup>asup><sup> ; sup><sup>bsup> ; Minghong Yang<sup>bsup><sup> ; sup><sup>csup><sup> ; sup><sup>m.yang@whut.edu.cnsup> ; Jiankun Peng<sup>bsup> ; Dajuan Lv<sup>bsup>
• 关键词：Optical coating interference ; Temperature sensor ; Theoretical simulation ; Optical fiber
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：130
• 期：Complete
• 页码：1014-1020
• 全文大小：1232 K
• 卷排序：130

文摘

A temperature sensor with Fabry–Perot cavity formed by dielectric film on the tip of multimode fiber is theoretically simulated and experimentally demonstrated. The sensor is proved to be simple in configuration, low cost and easy for batch fabrication. The thermo-optic effect and thermal expansion property of the thin-film materials, and optical coating interference theory were analyzed by MATLAB in the simulation. Experimental result shows that the repeatability error of the fabricated temperature sensor is 6.67%, when the environment temperature changes from 200 °C to 700 °C, and the temperature characteristic of interference fringes is almost the same as in simulation. The simulation analysis can be used to choose thin film materials and coating formula which is sensitive to temperature and robust for tolerance.