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Open AccessArticle

Study on the Sensing Coating of the Optical Fibre CO2 Sensor

1
InPhoTech, 17 Słomińskiego St31, 00-195 Warszawa, Poland
2
IPT Safety, Ceramiczna St 8A, 20-150 Lublin, Poland
3
Polish Centre for Photonics and Fibre Optics, Rogoźnica 312, 36-060 Głogów Małopolski, Poland
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Michael Tiemann
Sensors 2015, 15(12), 31888-31903; https://doi.org/10.3390/s151229890
Received: 31 August 2015 / Revised: 10 December 2015 / Accepted: 11 December 2015 / Published: 17 December 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
Optical fibre carbon dioxide (CO2) sensors are reported in this article. The principle of operation of the sensors relies on the absorption of light transmitted through the fibre by a silica gel coating containing active dyes, including methyl red, thymol blue and phenol red. Stability of the sensor has been investigated for the first time for an absorption based CO2 optical fiber sensor. Influence of the silica gel coating thickness on the sensitivity and response time has also been studied. The impact of temperature and humidity on the sensor performance has been examined too. Response times of reported sensors are very short and reach 2–3 s, whereas the sensitivity of the sensor ranges from 3 to 10 for different coating thicknesses. Reported parameters make the sensor suitable for indoor and industrial use. View Full-Text
Keywords: optical fiber sensors; CO2 sensors; gas sensors; chemical sensors; sol-gel coatings; silica gels; indicator dyes; absorption-based sensors optical fiber sensors; CO2 sensors; gas sensors; chemical sensors; sol-gel coatings; silica gels; indicator dyes; absorption-based sensors
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Wysokiński, K.; Napierała, M.; Stańczyk, T.; Lipiński, S.; Nasiłowski, T. Study on the Sensing Coating of the Optical Fibre CO2 Sensor. Sensors 2015, 15, 31888-31903.

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