期刊
OPTICS AND LASERS IN ENGINEERING
卷 111, 期 -, 页码 167-171出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2018.08.007
关键词
Optical fiber sensor; Fabry-Perot interferometer; Fiber Bragg grating; Refractive index; Temperature; Excimer laser
类别
资金
- Natural Science Basic Research Plan in Shaanxi Province of China [2013JM8032]
- Graduate Student Innovation Fund of Xi'an Shiyou University [YCS16211031]
A miniature and all-optical fiber sensor based on integration of Fabry-Perot interferometer (FPI) and fiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement of refractive index (RI) and temperature in this paper. The integrated FPI-FBG composite fiber sensor is constructed by manufacturing a micro-hole in FBG, where two parallel reflecting surfaces of micro-hole perform as cavity mirrors of FPI. Experimental results show that the temperature and RI sensitivity of spectral dip wavelength for FPI are -0.189 nm/degrees C and 1210.490 nm/RIU, respectively. The temperature sensitivity for FBG is -0.011 nm/degrees C, and the FBG is insensitive to RI. Using these different sensitivities, a matrix can be constructed and used in simultaneous measurement of RI and temperature. The resolutions of 0.1 degrees C and 1.5 x 10(-5) RIU can be obtained. Owing to compact size in dimensions, the sensor can be used to measure RI and temperature simultaneously in tiny liquid environment.
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