Patent ID: 6755653
Filing Date: 2004-06-29
Classification: F41A,F41G,F41J

Abstract:
An optical system for detecting contamination to prevent cheating in a simulated combat exercise, comprising:a housing; a detector mounted in the housing for detecting incident optical radiation having a predetermined wavelength and for generating signals representative thereof; an optical element mounted to the housing for allowing optical radiation received from an exterior side of the optical element to pass through the optical element and impinge upon the detector; a source of illumination mounted inside the housing for selectively illuminating the optical element from an interior side thereof with optical radiation having the predetermined wavelength; test circuit means connected to the detector for determining the presence of a predetermined amount of a contaminant on an exterior surface of the optical element based on the signals generated by the detector when the optical element is illuminated by radiation from the source of illumination; and means connected to the circuit means for providing an indication to a player that the predetermined amount of the contaminant has been detected on the exterior surface of the optical element.