Detection of volatile organic compounds through a sensing film of TiO2 doped with organic dyes deposited on an optical fiber

S. Muñoz A.; J. Ramos M.; C. Martínez H.; J. Castillo M.; G. Beltrán P.; R. Palomino M.

doi:10.1117/12.742349

16 May 2007 Detection of volatile organic compounds through a sensing film of TiO₂ doped with organic dyes deposited on an optical fiber

S. Muñoz A., J. Ramos M., C. Martínez H., J. Castillo M., G. Beltrán P., R. Palomino M.

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Proceedings Volume 6422, Sixth Symposium Optics in Industry; 64220E (2007) https://doi.org/10.1117/12.742349
Event: Sixth Symposium Optics in Industry, 2007, Monterrey, Mexico

Abstract

The necessity of detection and recognition of different types of gases, such as volatile organic compounds, which are frequently found in food and beverage industries among others, requires the development of different types of sensors. In this work, an application of optical fiber for the detection of volatile organic compounds, particularly ethanol is presented. The sensor was constructed removing a portion of the cladding and depositing instead a sensing titanium dioxide (TiO₂) film doped with an organic dye (rhodamine 6G) by the sol-gel method. The sensor response was measured in a Teflon chamber where the sample to be measured was injected. A He-Ne laser beam was coupled to the fiber and the variation in the output power was measured which indicates the gas presence. The difference between the output power with and without gas gives a measure of the concentration that exists in the chamber. The experimental results showed that for an ethanol concentration range from 0 to 10500 ppm, the response of the sensor was approximately linear with a correlation coefficient of 0.9924.

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S. Muñoz A., J. Ramos M., C. Martínez H., J. Castillo M., G. Beltrán P., and R. Palomino M. "Detection of volatile organic compounds through a sensing film of TiO₂ doped with organic dyes deposited on an optical fiber", Proc. SPIE 6422, Sixth Symposium Optics in Industry, 64220E (16 May 2007); https://doi.org/10.1117/12.742349

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KEYWORDS

Sensors

Optical fibers

Cladding

Bioalcohols

Sol-gels

Absorption

Gas sensors

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