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US 5,206,502 AGranted
Laser radiation detection system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorKeith L. Gardner
Life of this patent
Estimating the term…
Abstract
A laser radiation detection system using a spatial/wavelength filter to "ulate" the response of a detector as a function of wavelength, allowing discrimination of laser sources against broad spectral sources, as well as wavelength determination.
Claims8
A laser radiation detection system for detecting monochromatic radiation with respect to a white noise background comprising:
- a least one channel including:
- dispersing means for spectrally receiving and dispersing incoming light incident thereon;
- the output beam from said dispersing means defining an optical path;
- filtering means positioned in said optical path adjacent the output of said dispersing means for spatially filtering the output of said dispersing means;
- said filter operating to produce optical outputs consisting of reflected radiation and transmitted radiation when radiation impinges thereon;
- the transmissivity and reflectivity of said filter means varying across the face of said filter means with respect to d where d is the distance across the face of said filter;
- detector means in the path of said reflected and transmitted radiation;
- each said detector means outputting signals therefrom;
- and differencing means operatively receiving the outputs of each said detector means and providing an output indicative of reception of monochromatic radiation in the system.
6 more elements
Dependencies are inferred from the claim text.