Semiconductor diode laser spectrometer arrangement and method
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United States of America Patent
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Oct 16, 2007
Grant Date -
Jul 21, 2005
app pub date -
Apr 8, 2003
filing date -
Apr 9, 2002
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Abstract
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 (17); applying a step function electrical pulse (19) to a semiconductor diode laser (20) to cause the laser (20) to output a continuous wavelength chirp for injecting (16a) into the optical cell (17); injecting (16a) the wavelength chirp into the optical cell (17); using the wavelength variation provided by the wavelength chirp as a wavelength scan, and detecting (23) light emitted from the cell (17), wherein a chirp rate is selected to substantially prevent light interference occurring in the optical cell (17).
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