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Sensors 2008, 8(10), 6769-6776; doi:10.3390/s8106769
Article

Linear FBG Temperature Sensor Interrogation with Fabry-Perot ITU Multi-wavelength Reference

 and
*
Division of Electronics and Information Engineering, Chonbuk National University, Jeonju 561-756, Korea
* Author to whom correspondence should be addressed.
Received: 9 October 2008 / Revised: 20 October 2008 / Accepted: 28 October 2008 / Published: 29 October 2008
(This article belongs to the Section Chemical Sensors)
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Abstract

The equidistantly spaced multi-passbands of a Fabry-Perot ITU filter are used as an efficient multi-wavelength reference for fiber Bragg grating sensor demodulation. To compensate for the nonlinear wavelength tuning effect in the FBG sensor demodulator, a polynomial fitting algorithm was applied to the temporal peaks of the wavelength-scanned ITU filter. The fitted wavelength values are assigned to the peak locations of the FBG sensor reflections, obtaining constant accuracy, regardless of the wavelength scan range and frequency. A linearity error of about 0.18% against a reference thermocouple thermometer was obtained with the suggested method.
Keywords: Fiber Bragg grating; Fabry-Perot filter; Fiber-optic temperature sensor Fiber Bragg grating; Fabry-Perot filter; Fiber-optic temperature sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Park, H.-J.; Song, M. Linear FBG Temperature Sensor Interrogation with Fabry-Perot ITU Multi-wavelength Reference. Sensors 2008, 8, 6769-6776.

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