Temperature measurement with optical fiber Mach-Zehnder interferometer combined with Vernier effect

Patrícia Flor; Ana I. Freitas; Jörg Bierlich; Paulo Antunes; Marta S. Ferreira

doi:10.1117/12.3022526

20 June 2024 Temperature measurement with optical fiber Mach-Zehnder interferometer combined with Vernier effect

Patrícia Flor, Ana I. Freitas, Jörg Bierlich, Paulo Antunes, Marta S. Ferreira

Proceedings Volume 12999, Optical Sensing and Detection VIII; 129992T (2024) https://doi.org/10.1117/12.3022526
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

In this work, we propose an optical fiber sensor based on a silica capillary section spliced between two sections of single mode fiber. One of the fusion splices is done with a transversal offset, to enable the creation of a Mach-Zehnder interferometer (MZI). Furthermore, the structure, monitored in transmission, also exhibits anti-resonant behavior. This effect is inhibited by submerging the sensor in liquid media, and the MZI becomes dominant. The sensor with a length of 3.75 mm presented a linear response to temperature with a sensitivity of 26.0 pm/°C. Combining this sensor with another with a length of 3.82 mm, in a parallel configuration where both sensors are placed under water, an interferometric pattern with a higher frequency modulated by a lower one is attained, which is produced by the Vernier effect. The sensor, although insensitive to refractive index variations, showed a maximum temperature sensitivity of 2.193 nm/°C, showcasing a magnification factor of 84.3. This sensor may find applications in different fields where an accurate measurement of temperature in liquid media is required, such as chemistry, pharmaceutical, and biological applications.

Citation Download Citation

Patrícia Flor, Ana I. Freitas, Jörg Bierlich, Paulo Antunes, and Marta S. Ferreira "Temperature measurement with optical fiber Mach-Zehnder interferometer combined with Vernier effect", Proc. SPIE 12999, Optical Sensing and Detection VIII, 129992T (20 June 2024); https://doi.org/10.1117/12.3022526

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