Optics: measuring and testing – Infrared and ultraviolet
Patent
1976-11-18
1977-10-18
McGraw, Vincent P.
Optics: measuring and testing
Infrared and ultraviolet
73 231, 250345, 356106S, 356181, 356205, G01N 2134, G01J 342
Patent
active
040543846
ABSTRACT:
Apparatus and process provide qualitative and quantitative analysis of sample constituent(s) in a stream of fluid, relatively free from qualitative ambiguities and quantitative zero displacements due to slowly changing contamination in the measurement stream. Slowly changing zero displacement of a continuous measurement signal -- caused by slowly changing contaminant concentrations in the stream -- is cancelled out by deriving two continuous versions of the measurement signal, both being time-distorted, and continuously manipulating the two versions as by subtraction.
One of the two time-distorted versions serves as a primary or "main" signal; this main signal version is distorted in such a way that the time distortion of the other signal version is roughly symmetrical with respect to the main signal version, to improve measurement accuracy when the rate of zero displacement is nonlinear. In the case of spectral analysis, particular advantages lie in removal of misleading "background" spectral components.
REFERENCES:
patent: 3345859 (1967-10-01), Fenske
patent: 3992109 (1976-11-01), Bock
Lippman Peter I.
McGraw Vincent P.
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