Correction of spectra for stray radiation

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73 1G, 2502521, 356307, 364498, 36457101, 36457104, G01D 1800

Patent

active

054285585

ABSTRACT:
A method and apparatus are provided for correction of spectra for stray radiation in a spectrometric instrument, involving a sequence of steps as follows. Spectral patterns are obtained with the instrument initially for monochromatic radiation at a plurality of selected calibration wavelengths. By computer program, the peak profile at the calibration wavelength in each pattern is replaced with a substitute based on the remaining pattern. The resulting data are interpolated to effect values denoted "stray proportions" for the ordered wavelengths of the instrument. Spectral data at each ordered wavelength are obtained with the instrument for a sample, and multiplied in the computer program by stray proportions for corresponding wavelengths to effect further sets of values denoted "stray portions" that are identified to the ordered wavelengths. Each set is identified to one of the wavelength increments of the instrument across the spectral range. In each set, the stray portions for the ordered wavelengths are summed. The total for each wavelength increment is subtracted from the original sample data for the increment to effect spectral data corrected for stray.

REFERENCES:
patent: 3790797 (1974-02-01), Sternberg et al.
patent: 3790798 (1974-02-01), Sternberg et al.
patent: 4820048 (1989-04-01), Barnard
patent: 5023804 (1991-06-01), Hoult
patent: 5121337 (1992-06-01), Brown
patent: 5229838 (1993-07-01), Ganz et al.
patent: 5341206 (1994-08-01), Pittaro et al.

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