An etched chirped fiber Bragg grating for measurement of refractive index and temperature pattern

M. Shaimerdenova; T. Ayupova; M. Sypabekova; S. Korganbayev; A. Bekmurzayeva; K. Dukenbayev; C. Molardi; D. Tosi

doi:10.1117/12.2502471

23 October 2018 An etched chirped fiber Bragg grating for measurement of refractive index and temperature pattern

M. Shaimerdenova, T. Ayupova, M. Sypabekova, S. Korganbayev, A. Bekmurzayeva, K. Dukenbayev, C. Molardi, D. Tosi

Proceedings Volume 10820, Optics in Health Care and Biomedical Optics VIII; 108203B (2018) https://doi.org/10.1117/12.2502471
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

In this work, partially etched chirped fiber Bragg grating (pECFBG) for the real-time multi-parameter measurement of temperature and refractive index is proposed. The sensor is fabricated by wet-etching a portion of a linearly chirped FBG with linear chirp profile. Obtained CFBG has two active areas: the unetched part of the grating that can be used either as a uniform temperature sensor, or to detect thermal gradients experienced through the grating length; the etched part, besides having a similar thermal sensitivity, is exposed to refractive index sensing through the variations of external refractive index. Overall, the pECFBG structure behaves as a compact sensor with multi-parameter capability, that can both measure temperature and refractive index on the same grating, but also spatially resolve temperature detection through the grating section. The results have been validated through both a model and experimental setup, showing that the mutual correlation algorithm applied to different spectral parts of the grating is able to discriminate between uniform and gradient-shaped temperature profiles, and refractive index changes. The reflected spectra showed a clear correlation between the RI change of the surrounding media and spectral shift with temperature variations.

Citation Download Citation

M. Shaimerdenova, T. Ayupova, M. Sypabekova, S. Korganbayev, A. Bekmurzayeva, K. Dukenbayev, C. Molardi, and D. Tosi "An etched chirped fiber Bragg grating for measurement of refractive index and temperature pattern", Proc. SPIE 10820, Optics in Health Care and Biomedical Optics VIII, 108203B (23 October 2018); https://doi.org/10.1117/12.2502471

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