Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1965-06-08
1978-08-29
Pendegrass, Verlin R.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01N 2126
Patent
active
041106180
ABSTRACT:
Presence of a substance in a gaseous medium is detected by introducing a controlled quantity of the gaseous medium into a variable volume chamber including a cylinder having a hemispherical end wall with optically polished internal surface, and adiabatically compressing the gas by means of a piston reciprocable with the cylinder. The face of the piston opposite the hemispherical end wall of the cylinder is also of hemispherical contour. Upon adiabatic compression of the gas the temperature thereof increases to produce spectral emissions from the gaseous constituents, modulated in accordance with the recurrent variation of volume of the chamber. A detector is provided to sense any emissions occurring within the chamber at the wavelength of the substance in question.
REFERENCES:
patent: 2806957 (1957-09-01), McDonald
patent: 3005097 (1961-10-01), Hummel
patent: 3222522 (1965-12-01), Birkebak
American Standard Inc.
Crooks Robert G.
Pendegrass Verlin R.
Salerno, Jr. James J.
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