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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 13 — May. 1, 2014
  • pp: 2936–2941

Drift-eliminating method of intensity demodulation on a chirped fiber grating strain sensor

Jianjun Pan, Weilai Li, and Jie Liu  »View Author Affiliations

Applied Optics, Vol. 53, Issue 13, pp. 2936-2941 (2014)

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It is quite possible to detect the strain of a sample based on a chirped fiber grating (CFG) sensor, which has a wider bandwidth of light signal than a fiber Bragg grating. Usually, environmental factors play negative roles in the process of intensity demodulation. A drift-eliminating method of CFG intensity demodulation has been created and tested in our lab. Three CFG sensors were involved in this research. Two of them with close wavelength bands connected in series were used as a strain sensing unit; the third one was used as a referencing grating working within the reflective wavelength spectrum of the other two. It is shown that the signal ratio of the sensing unit and the referencing grating is a linear function of the loading strain. The linearity is as high as 99.79%.

© 2014 Optical Society of America

OCIS Codes
(230.0040) Optical devices : Detectors
(230.1480) Optical devices : Bragg reflectors
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Optical Devices

Original Manuscript: December 23, 2013
Revised Manuscript: March 26, 2014
Manuscript Accepted: March 31, 2014
Published: April 30, 2014

Jianjun Pan, Weilai Li, and Jie Liu, "Drift-eliminating method of intensity demodulation on a chirped fiber grating strain sensor," Appl. Opt. 53, 2936-2941 (2014)

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