Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1988-05-02
1990-12-18
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250339, 250345, G01J 342
Patent
active
RE0334936
ABSTRACT:
Spectroscopic measurements of stable isotopes are performed using a tunable lead salt diode laser. The design of the system is based upon the optimization of isotopic spectral lines from two different path lengths in an absorption cell using a single gaseous sample. A short path cell to measure the more abundant species and a long path cell to measure the less abundant species are used. A micrometer adjustment of a path length is used for equalizing spectral line intensities to obtain a measure of isotope enrichment or of absolute isotopic concentration.
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Lee Peter S.
Majkowski Richard F.
Partin Dale L.
Fields Carolyn E.
Freeman John C.
General Motors Corporation
Hartman Domenica N. S.
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