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Detection of Propane by IR-ATR in a Teflon®-Clad Fluoride Glass Optical Fiber

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The detection of propane with the use of ATR spectroscopy at 3.3 μm, as the gas diffuses through the Teflon® cladding of a fluoride optical fiber, is reported. A theoretical expression for the time-dependent absorbance of the fiber sensor as a function of diffusion coefficient and cladding dimensions is developed. The experimental data fitted to the model give a diffusion coefficient of 8.85 × 10−14 m2 s−1 for propane in Teflon®. The potential of the technique for remote or distributed sensing of hydrocarbons is discussed.

Keywords: Diffusion; Fluoride optical fiber; IR-ATR; Teflon®

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702904417698

Affiliations: School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland

Publication date: November 1, 1990

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