Abstract

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.

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