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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 15 — Jul. 18, 2011
  • pp: 14696–14706

Long-period fiber grating sensor with a styrene-acrylonitrile nano-film incorporating cryptophane A for methane detection

Jianchun Yang, Chuanyi Tao, Xueming Li, Guangqin Zhu, and Weimin Chen  »View Author Affiliations


Optics Express, Vol. 19, Issue 15, pp. 14696-14706 (2011)
http://dx.doi.org/10.1364/OE.19.014696


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Abstract

This paper presents a novel sensor design and application of long period fiber grating (LPFG) for detection of methane. A styrene-acrylonitrile nano-film incorporating cryptophane A, which is sensitive to methane in close vicinity to the surface, is constructed onto the cladding of long-period grating. For optimal design of the LPFG sensor, the relationship between the resonant wavelength shift and the complex refractive index of sensing film is analyzed based on the coupled-mode theory. The change in refractive index of the sensing film, induced by methane, can easily be obtained as a shift in resonance wavelength. The prepared LPFG sensor with time response of 50 s and good sensitivity (~0.375 nm %−1) suitable for the detection of methane below 3.5 vol. % is demonstrated. The response of the sensor (wavelength shift) is linear with methane concentration within our tested range and a detection limit of about 0.2% is estimated for the new sensor.

© 2011 OSA

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.1880) Instrumentation, measurement, and metrology : Detection
(130.6010) Integrated optics : Sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Sensors

History
Original Manuscript: May 18, 2011
Revised Manuscript: June 24, 2011
Manuscript Accepted: June 25, 2011
Published: July 15, 2011

Citation
Jianchun Yang, Chuanyi Tao, Xueming Li, Guangqin Zhu, and Weimin Chen, "Long-period fiber grating sensor with a styrene-acrylonitrile nano-film incorporating cryptophane A for methane detection," Opt. Express 19, 14696-14706 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-15-14696


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