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9 May 2007 Fabry-Perot liquid crystal tunable filter for interrogation of multiple fibre Bragg grating sensors
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Abstract
In this paper we analyze the performance of a fibre Bragg grating (FBG) interrogation system based on a liquid crystal tunable filter (LCTF), which acts as a channel dropper for multiple FBG sensors coupled to a simple all-fibre ratiometric wavelength measurement scheme in which a macrobending single-mode fibre is utilized as an edge filter. We present a model of the proposed interrogation scheme and analyse the optimum design parameters for the LCTF. From the model, the optimum ratio between the number of FBG sensors and the tunable filter bandpass can be found. Experimental results for the wavelength interrogation system are presented to validate the theoretical predictions. The model should be also suitable for similar interrogation systems using other forms of tunable bandpass filters.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. Semenova, G. Farrell, and G. Rajan "Fabry-Perot liquid crystal tunable filter for interrogation of multiple fibre Bragg grating sensors", Proc. SPIE 6587, Liquid Crystals and Applications in Optics, 658714 (9 May 2007); https://doi.org/10.1117/12.722481
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