Phase signal analysis for high-sensitive temperature fiber-optic external Fabry-Perot-cavity sensor (7 pages)

• T. Lozano-Hernández ^[1] ; D. Jauregui-Vázquez ^[3] ; J.M. Estudillo-Ayala ^[1] ; E. Díaz-Cervantes ^[1] ; J.A. Álvarez-Chavez ^[2] ; J.M. Sierra-Hernández ^[1] ; H.L. Offerhaus ^[1]
  1. [1] Universidad de Guanajuato

     Universidad de Guanajuato

     México

     
  2. [2] University of Twente

     University of Twente

     Países Bajos

     
  3. [3] entro de Investigación Científica y de Educación Superior de Ensenada, México

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 70, Nº. 5, 2024
• Idioma: inglés
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• Resumen

  • We experimentally demonstrate a highly temperature-sensitive external Fabry-Perot cavity. The interferometric structure is composed of an air-microcavity; its fabrication uses a microcapillary and UV polymer. A temperature sensitivity close to 5.7 nm/◦C is achieved with suitable linearity (0.9896) and minimal hysteresis; a phase analysis technique is proposed and applied to overcome the trade-off between sensitivity and range of operation. This technique provides a competitive sensitivity (0.84 rad/◦C), good linearity (0.9934), and a range of operation from 25◦C to 41◦C.