Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> The properties of <formula formulatype="inline"><tex Notation="TeX">${\rm Al}_{x}{\rm In}_{1-x}{\rm Sb}$</tex></formula> light-emitting diodes (LEDs) and photodetectors have been investigated to establish their suitability for methane sensing. Using these components it is possible to achieve good signal-to-noise values at both the characteristic absorption wavelength and also at <formula formulatype="inline"><tex Notation="TeX">${4}~\mu{\rm m}$</tex></formula>, an attractive wavelength for use as a reference channel. A limit of sensitivity of approximately 400 ppm, with an integration time of 10 s and a path length of 5 cm, was estimated for methane detection </para>
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