Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrophotometer
Patent
1982-03-05
1985-07-02
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrophotometer
G01J 342
Patent
active
045264708
ABSTRACT:
Methods for stray light measurement and compensation in spectrophotometers are disclosed. In one exemplary embodiment, stray light is determined as a convolution of a selected detected radiant power spectrum and a monochromator slit function. Such a stray light measurement may be made with or without the sample in an optical path between a source and detector within the spectrophotometer. When made with the sample in the optical path, the resulting stray light measurement may be used to compensate sample absorbance or transmittance measurements. In accordance with another embodiment of the present invention, sample absorbance or transmittance may be compensated in a method including measuring sample detected radiant power at a wavelength outside an interval of significant detected radiant power within which a sample measurement compensated for stray is desired.
REFERENCES:
Tarrant, "Optical Techniques for Studying Stray Light in Spectrophotometers", Optica Acta, vol. 25, No. 12, Dec. 1978, pp. 1167-1174.
"Standard Method of Estimating Stray Radiant Energy of Spectrophotometers", ANSI/ASTM E387-72.
Opler, A., Journal of the Optical Society of America, vol. 40, p. 401 (1950).
Stewart, J. E., (Infrared Spectroscopy, Experimental Methods and Techniques); Marcel Dekker, New York, 1970; pp. 231-251, 285, and 286.
Kaye, W., "Resolution and Stray Light in Near Infrared Spectroscopy", Applied Optics, vol. 14, No. 8, pp. 1977-1986 (Aug. 1975).
Beckman Instruments Inc.
Evans F. L.
Hampson G. T.
Meads R. R.
Steinmeyer R. J.
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