Title:
SEMICONDUCTOR DIODE LASER SPECTROMETER ARRANGEMENT AND METHOD
Document Type and Number:
WIPO Patent Application WO2003087787
Kind Code:
A8
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 wavelengh 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 occuring in the optical cell (17).
Inventors:
LANGFORD NIGEL (GB)
DUXBURY GEOFFREY (GB)
NORMAND ERWAN (GB)
DUXBURY GEOFFREY (GB)
NORMAND ERWAN (GB)
Application Number:
PCT/GB2003/001510
Publication Date:
December 31, 2003
Filing Date:
April 08, 2003
Export Citation:
Assignee:
UNIV STRATHCLYDE (GB)
LANGFORD NIGEL (GB)
DUXBURY GEOFFREY (GB)
NORMAND ERWAN (GB)
LANGFORD NIGEL (GB)
DUXBURY GEOFFREY (GB)
NORMAND ERWAN (GB)
International Classes:
G01N1/00; G01N21/03; G01N21/39; G01J3/42; H01S5/00; H01S5/34; (IPC1-7): G01N21/39; G01N21/35; H01S5/34
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