Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1994-04-11
1995-09-12
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
356246, G01J 344
Patent
active
054501938
ABSTRACT:
Method and apparatus for determining the composition and concentration of gases present in a patient's airway by measurement of the spectrum of Raman scattered light from these gases. The efficiency is improved by collecting Raman scattered light generated outside the collection region. The gases present are assumed to be drawn from a predetermined set of gases with known Raman scattering spectra, and the concentrations are determined by solution of a matrix equation Ac=b, where the c vector components are the unknown concentrations and the b vector components are determined from measurements of the Raman scattering intensifies in a plurality of wavelength or wavenumber intervals. The linear system of equations represented by the matrix equation may be overdetermined and may require solution by non-conventional methods, such as singular value decomposition.
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English Translation of Ref. doc. DE2723939.
Carlsen William F.
Gray Damien F.
Hopkins, II George W.
Perry Jeffrey
Pittaro Richard J.
Hantis K. P.
Hewlett--Packard Company
McGraw Vincent P.
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