Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1990-04-10
1991-10-29
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503385, G01J 345
Patent
active
050618547
ABSTRACT:
A short scan passive infrared remote sensor for detecting a target chemical pecies, located some distance from the center burst, includes a telescope for targeting a remote gas, a beam splitter means for splitting a beam from the target gas and sending one portion along a first path to an infrared detector and sending a second portion along a second path longer than the first path to the infrared detector. The second path is variable by providing a moving mirror a first distance away from the beam splitter which is 0.5 mm farther away from the beam splitter than the fixed mirror. By this arrangement, a mirror movement of only 0.5 mm is required to obtain an equivalent of 8 cm.sup.-1 spectral information for processing with time domain digital filters. The information from the infrared detector is converted from analog to digital and fed to a digital signal processor. The resulting interferogram is then filtered by a microprocessor using a FIR linear digital filter.
REFERENCES:
patent: 4797923 (1989-01-01), Clarke
patent: 4810884 (1989-03-01), Carlson
Davis Dennis M.
Desha Michael S.
Ditillo John T.
Hoffland Lynn D.
Kroutil Robert T.
Goldberg Edward
Hannaher Constantine
Lane Anthony T.
Sachs Michael C.
The United States of America as represented by the Secretary of
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