Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1995-05-15
1996-08-06
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250343, 250345, G01N 2100
Patent
active
055436218
ABSTRACT:
A diode laser spectrometer includes a sample chamber for holding a sample gas, e.g., human breath, having first and second isotopic species in an unknown concentration ratio and a reference chamber for holding a reference gas having the first and second isotopic species in a known concentration ratio. Laser light is directed through both chambers at wavelengths corresponding to absorption wavelength of the isotopic species, and the light is detected and sample and reference signals generated. The signals are processed by a computer to determine the concentration ratio of the first isotopic species to the second isotopic species in the sample gas. The diode laser is cooled by a thermoelectric cooler or a cryocooler operating as a reverse Sterling engine.
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Becker Joseph F.
de la Torre-Bueno Jose
Sauke Todd B.
Hannaher Constantine
Rogitz John L.
San Jose State University Foundation
Seti Institute
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