Cascade Technologies Limited

Nigel Langford

Erwan Normand

Geoffrey Duxbury

A method apparatus for sensing gases using a semiconductor diode laser spectrometer, the method comprising: introducing a sample gas into a non-resonant optical cell (); applying a step function electrical pulse () to a semiconductor diode laser () to cause the laser () to output a continuous wavelength chirp for injecting () into the optical cell (); injecting () the wavelength chirp into the optical cell (); using the wavelength variation provided by the wavelength chirp as a wavelength scan, and detecting () light emitted from the cell (), wherein a chirp rate is selected to substantially prevent light interference occurring in the optical cell ().

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Glasgow, United Kingdom

Nigel Langford