Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1966-10-17
1977-12-13
Buczinski, S. C.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250336, 250339, 250343, 250345, 356 81, 356 85, G01J 100
Patent
active
040630943
ABSTRACT:
Presence of a substance in a gaseous medium is detected by introducing a sample of the gaseous medium under consideration into a variable volume cavity formed by the walls of a cylinder and the operating face of a piston reciprocable in the cylinder, the adiabatically compressing the gas in the cavity by cyclic reciprocation of the piston to increase the temperature of the gas and thereby cause emission of radiant energy by constituents of the gas sample at their respective characteristic emission spectra. The emissions are modulated in accordance with the recurrent variation of volume of the cavity. The piston is gas-centered during operation to inhibit sliding contact between surfaces and thereby permit oilless and powderless operation which would otherwise present contaminants tending to interfere with detection of the substances of interest. A portion of the wall of the cavity has a multi-layer composition that cancels greybody signals resulting from movement of the piston and presence of interfering substances, and initial calibration is achieved by insertion into the cavity of a material whose emission spectrum is known in advance.
REFERENCES:
patent: 3005097 (1961-10-01), Hummel
American Standard Inc.
Buczinski S. C.
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