A low cost relative humidity sensor fabricated by coating optical fused fiber coupler with sol-gel material

Fufei Pang; Ping Xu; Min Wang; Xianglong Zeng; Zhenyi Chen; Tingyun Wang

doi:10.1117/12.756912

26 November 2007 A low cost relative humidity sensor fabricated by coating optical fused fiber coupler with sol-gel material

Fufei Pang, Ping Xu, Min Wang, Xianglong Zeng, Zhenyi Chen, Tingyun Wang

Author Affiliations +

Proceedings Volume 6830, Advanced Sensor Systems and Applications III; 68300M (2007) https://doi.org/10.1117/12.756912
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

A novel optical fiber relative humidity(RH) sensor was proposed in this paper based on fiber evanescent wave coupling. Sol-gel material with porous microstructure as water molecules sensitivity film was dip-coated upon coupling region surface. Visibility calculated from output optical powers of the coupler sensor was taken to show the sensitivity to relative humility. From the experimental results, with increasing relative humidity ranged from 25% to 95%, the visibility decreased in a good linear manner. And the sensitivity was approximate 0.132/RH%. Due to simple technique and low lost of the fiber coupler relative humidity sensor, it will be applied widely.

Citation Download Citation

Fufei Pang, Ping Xu, Min Wang, Xianglong Zeng, Zhenyi Chen, and Tingyun Wang "A low cost relative humidity sensor fabricated by coating optical fused fiber coupler with sol-gel material", Proc. SPIE 6830, Advanced Sensor Systems and Applications III, 68300M (26 November 2007); https://doi.org/10.1117/12.756912

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