Partially etched chirped fiber bragg grating (pecfbg) for joint temperature, thermal profile, and refractive index detection

Sanzhar Korganbayev, Takhmina Ayupova, Marzhan Sypabekova, Aliya Bekmurzayeva, Madina Shaimerdenova, Kanat Dukenbayev, Carlo Molardi, Daniele Tosi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


In this work, a partially etched chirped fiber Bragg grating (pECFBG) is introduced, as a compact sensor for multi-parametric measurement of temperature, thermal gradients over the active length, and refractive index. The sensor is fabricated by wet-etching a portion of a 14-mm linearly chirped FBG with linear chirp profile. The resulting device has two active areas: the unetched part of the grating (2 mm) can be used either as a uniform temperature sensor, or to detect thermal gradients experienced through the grating length by means of a spectral reconstruction technique; the etched part (12 mm), besides having a similar thermal sensitivity, is exposed to refractive index sensing through the introduction of a sensitivity to 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.

Original languageEnglish
Pages (from-to)18708-18720
Number of pages13
JournalOptics Express
Issue number14
Publication statusPublished - Jul 9 2018

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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