Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1991-08-19
1993-02-02
Noland, Tom
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2502521, 250339, G01N 2161
Patent
active
051840170
ABSTRACT:
A non-dispersive infrared gas analyzer especially adapted for measuring the concentrations of HC, CO and CO.sub.2 in a vehicle exhaust includes a sample chamber for holding a sample gas, a radiation emitter for directing a beam through the chamber and a detector for indicating the amount of radiation absorbed. A plurality of filters each of which transmit radiation at an absorption band of a gas component to be detected are alternatingly positioned in the radiation path to produce a time-multiplexed signal having concentration information for all gases. The time-multiplexed detector output is corrected for gain and offset errors "on-the-fly", without requiring demultiplexing, through the use of an analog multiplier circuit. The correction factors are themselves determined without demultiplexing the detector output signal.
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Danielson David O.
Johnson Ross E.
Kaste Keith
Tury Edward L.
Noland Tom
Sensors, Inc.
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