Optics: measuring and testing – For light transmission or absorption – By comparison
Patent
1991-04-01
1992-09-08
McGraw, Vincent P.
Optics: measuring and testing
For light transmission or absorption
By comparison
250341, 250343, 250345, 356246, G01N 2135
Patent
active
051462940
ABSTRACT:
A process and device for measuring the isotope ratio, specifically of stable isotopes, of chemical substances in a gas to be examined, the process including alternately charging a sample cell with a reference gas and a measuring gas containing the gas to be examined; adding a metrologically neutral gas to the gas to be examined; varying the mixing ratio of this measuring gas by changing the share of neutral gas being added; and calculation of the isotope ratio V.sub.p of the substance according to the equation: ##EQU1## The device includes a White cell having mirrors on each end of the longitudinal length of the cell, a pair of first beam openings located on a longitudinal end, a pair of second beam openings in spaced parallelism on the longitudinal sides of the White cell and a gas inlet and gas outlet located near each mirror.
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Grisar Roland
Riedel Wolfgang
Fraunhofer-Gesellschaft zur Forderung der ange-wandten Forschung
McGraw Vincent P.
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