G - Physics – 01 – J
Patent
G - Physics
01
J
G01J 1/58 (2006.01) G01J 3/12 (2006.01) G02F 2/02 (2006.01)
Patent
CA 2046593
2046593 9108453 PCTABS00005 A method is provided in which the pulse stretching effects of radiation trapping can be minimized in atomic resonance filter detectors or QLORD filter detectors of the type described in U.S. Patent 292,526. The QLORD detector, which consists of two spectral bandpass filters (10, 12), one of each located on either side of a transparent cell (14) containing an atomic vapor (preferably an alkali metal vapor), responds to an incoming pulse in the visible part of the spectrum of light, emitting a pulse of infrared light. If the transparent cell contains atomic (e.g. metallic) vapor only, the infrared light pulse will be stretched, because of resonant trapping within the metal vapor. However, in accordance with the present invention, an inert buffer gas is added to the metal vapor. This buffer gas allows the rapid leakage of infrared light photons from the wings of the energy spectrum, and hence a more rapid response to the incoming pulse. The present invention is particularly useful in overcoming "false alarms" such as bioluminescence signals when pulse stretching and external noise sources are superimposed, and when a rapid pulse repetition rate is useful.
Kaman Aerospace Corporation
Keeler R. Norris
Swabey Ogilvy Renault
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