Optics: measuring and testing – By shade or color – Fluid color transmission examination
Patent
1983-08-03
1986-04-01
Evans, F. L.
Optics: measuring and testing
By shade or color
Fluid color transmission examination
250345, 250351, 250338, 350274, 350275, 356414, G01N 2161
Patent
active
045794561
ABSTRACT:
A radiation beam, having passed through the mixture containing the component whose spectral composition contains at least one characteristic spectral line of the component, is caused to pass alternately along two channels one of which comprises a definite amount of the gaseous component and the other of which serves as reference. The second channel over which the radiation beam travels is limited to a diaphragm having a radiation transmission substantially equal to that of the first channel in the absence of said component in the mixture. The output beam from the two channels is directed towards a detector for detecting the variation of intensity of the beam through a filter for selecting said characteristic radiation.
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Evans F. L.
Harringa Joel L.
Office National d'Etudes et de Recherches
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