Inventors:
Robert T. Kroutil - Edgewood MD
John T. Ditillo - Baltimore MD
William R. Loerop - Aberdeen MD
Dennis M. Davis - Edgewood MD
Lynn D. Hoffland - Edgewood MD
Michael S. Desha - Baltimore MD
Assignee:
The United States of America as represented by the Secretary of the Army - Washington DC
International Classification:
G01J 345
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.