期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 27, 期 14, 页码 1495-1498出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2015.2426726
关键词
Fabry-Perot interferometer; optical fiber sensors; relative-humidity; porous films
资金
- Program for New Century Excellent Talents in University [NCET-10-0664]
- National Science Foundation of China [62190311]
- Changjiang River Scientific Research Institute [CKWV2013212/KY]
A multimode optical fiber humidity sensor composed of porous oxide films is demonstrated and optimized. Relative-humidity (RH) sensing is correlated with the shift of interference fringe due to the change of effective refractive index of porous coatings when exposed to different RH environments. An optical interference model that explains the sensing principle is presented, and the fabrication process, such as vacuum degree, baking temperature, is verified. Experimental results show that the average sensitivity is 0.7 nm/% RH (3.3% RH similar to 63% RH), the proposed sensors present high repeatability, little hysteresis, and especially highly sensitive to low and middle moisture measure.
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