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28 August 2019 Tilted FBGs coated with ZnO nano coatings for the development of VOC sensor
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Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111991Q (2019) https://doi.org/10.1117/12.2542430
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus
Abstract
The sensing properties of zinc oxide (ZnO) combined with tilted fiber Bragg gratings have been studied in this work for the development of organic vapor optical fiber sensors. ZnO has been deposited onto tilted optical fiber Bragg gratings by drop casting technique to obtain coatings with thickness below 100nm. For a title angle of 4°, cladding modes up to 4 dB peak to peak amplitude were obtained and, as a consequence, the fundamental mode strength dropped below 0.5dB. The sensing features were evaluated by exposing the sensor to saturated atmospheres of three different alcohols and acetone. A negligible change was registered for methanol but in the case of ethanol and isopropanol a 24pm red shift was observed; in the case of acetone, the shift was 96pm which is of the order of spectral width of certain cladding modes. For all cases, the shifts were reversed once the organic vapors were removed. Ongoing studies are focused on the optimization of the sensing layer as well as the tilted angle to enhance the spectral response of the sensor.
© (2019) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Elosúa, M. Konstantaki, A. Klini, F. J. Arregui, and S. Pissadakis "Tilted FBGs coated with ZnO nano coatings for the development of VOC sensor", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991Q (28 August 2019); https://doi.org/10.1117/12.2542430
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