Accession Number : ADD015115

Title :   Laser Detection and Discrimination System.

Descriptive Note : Patent,Filed 16 Aug 89, patented 3 Sep 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Chakrabarti, Kishalaya ; Mathur, Veerendra K

Report Date : 03 Sep 1991

Pagination or Media Count : 7

Abstract : Magnesium oxide sensing materials is pretreated and charged by UV radiation to identify impingement thereon of radiation from a near infrared laser source by detection of blue emissions which persist for an unusually long periods of time, avoiding frequent respotting and recharging. When heated to thermoluminescence peaks above room temperature by irradiation from a far infrared laser source, the magnesium oxide exhibits green luminescence enabling wavelength discrimination between detection of near and far infrared laser sources. Such pretreated magnesium oxide also produces green emissions when irradiated by UV laser sources, to distinguish between detection of the UV laser sources and the far infrared laser sources by discrimination between different fading behaviors of the green emissions.

Descriptors :   BLUE(COLOR), DETECTION, DISCRIMINATION, EMISSION, FAR INFRARED RADIATION, FREQUENCY, GREEN(COLOR), HEAT, INFRARED LASERS, IRRADIATION, LASERS, LONG RANGE(TIME), LUMINESCENCE, MAGNESIUM OXIDES, MATERIALS, NEAR INFRARED RADIATION, ROOM TEMPERATURE, SOURCES, THERMOLUMINESCENCE, ULTRAVIOLET LASERS, ULTRAVIOLET RADIATION

Subject Categories : Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE