G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/35 (2006.01) G01J 3/12 (2006.01)
Patent
CA 2125038
2125038 9311424 PCTABS00022 The invention relates to the remote infrared radiometric detection of chemical vapors (20). Air quality and substance control concerns present a need for more efficient ways of detecting the presence of select chemical vapors (20) in the atmosphere. A method and apparatus for such a detector includes elements for filtering (26, 34) collected infrared energy over a filter bandwidth by bandpass filtering only a fractional bandwidth of the filter bandwidth at any one time and repeatedly scanning the filter bandwidth with the passed fractional bandwidth. Also included are elements for measuring infrared energy (32) passed by the bandpass filtering thereby producing an output signal and for repeatedly nulling (40) the output signal in relation to the repeated scanning of the filter bandwidth. The invention is applicable to air monitoring including pollution control, chemical detection and the detection of any substances which provide telltale chemical vapors (20).
Labitt Bruce D.
Spade Gerald L.
Lockheed Sanders Inc.
Smart & Biggar
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