Sample-background-signal autocancellation in fluid-sample analyz

Details Sample-background-signal autocancellation in fluid-sample analyz Sample-background-signal autocancellation in fluid-sample analyz

1975-05-05

1977-06-14

McGraw, Vincent P.

Optics: measuring and testing

Infrared and ultraviolet

73 231, 250343, 250565, 356 82, 356106S, 356181, 356205, G01N 2134, G01J 342

Patent

active

040294161

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, at least one being time-distorted, and continuously manipulating the two versions as by subtraction. In the case of spectral analysis, particular advantages lie in removal of misleading "background" spectral components.

REFERENCES:
patent: 3345859 (1967-10-01), Fenske
patent: 3637310 (1972-01-01), Naond
patent: 3897154 (1975-07-01), Hawes
patent: 3992109 (1976-11-01), Bock

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