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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 5 — Feb. 28, 2011
  • pp: 4140–4146

Optical fiber relative humidity sensor based on FBG incorporated thin-core fiber modal interferometer

Bobo Gu, Mingjie Yin, A. Ping Zhang, Jinwen Qian, and Sailing He  »View Author Affiliations


Optics Express, Vol. 19, Issue 5, pp. 4140-4146 (2011)
http://dx.doi.org/10.1364/OE.19.004140


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Abstract

A new fiber-optic relative humidity (RH) sensor based on a thin-core fiber modal interferometer (TCFMI) with a fiber Bragg grating (FBG) in between is presented. Poly (N-ethyl-4-vinylpyridinium chloride) (P4VP·HCl) and poly (vinylsulfonic acid, sodium salt) (PVS) are layer-by-layer deposited on the side surface of the sensor for RH sensing. The fabrication of the sensing nanocoating is characterized by using UV-vis absorption spectroscopy, quartz crystal microbalance (QCM) and scanning electron microscopy (SEM). The incorporation of FBG in the middle of TCFMI can compensate the cross sensitivity of the sensor to temperature. The proposed sensor can detect the RH with resolution of 0.78% in a large RH range at different temperatures. A linear, fast and reversible response has been experimentally demonstrated.

© 2011 OSA

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2370) Fiber optics and optical communications : Fiber optics sensors

ToC Category:
Sensors

History
Original Manuscript: January 10, 2011
Revised Manuscript: February 10, 2011
Manuscript Accepted: February 10, 2011
Published: February 16, 2011

Citation
Bobo Gu, Mingjie Yin, A. Ping Zhang, Jinwen Qian, and Sailing He, "Optical fiber relative humidity sensor based on FBG incorporated thin-core fiber modal interferometer," Opt. Express 19, 4140-4146 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-5-4140


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