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

Sensors

Hyoung-Jun Park¹ 

[1] Division of Electronics and Information Engineering, Chonbuk National University, Jeonju 561-756, Korea; E-mail

关键词: Fiber Bragg grating;    Fabry-Perot filter;    Fiber-optic temperature sensor;   

DOI  :  10.3390/s8106769

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2008 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.