Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1998-06-24
1999-10-05
Pham, Hoa Q.
Optics: measuring and testing
For light transmission or absorption
By comparison
356436, 356 39, G01N 2100
Patent
active
059633352
ABSTRACT:
The present invention provides methods and devices for measuring radiation absorption by a sample. The invention enables one to determine whether the sample scatters the radiation of interest and, if so, to factor out the effects of such scattering and ore accurately determine the true absorption of the sample. The invention may employ a selectively controllable occluder which is moved between three or more different positions to yield three or more different radiation measurements. These measurements can then be compared to one another to determine the nature of any radiation scattering and factor out its effects, enabling more accurate absorption determinations.
REFERENCES:
patent: 3694086 (1972-09-01), May
patent: 3724952 (1973-04-01), Vossberg
patent: 4101221 (1978-07-01), Schunck et al.
patent: 4892409 (1990-01-01), Smith
Pham Hoa Q.
Waters Instruments Inc.
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