Accession Number : ADD014301

Title :   Laser Detection and Discrimination System.

Descriptive Note : Patent Application, Filed 16 Aug 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Charkrabarti, K ; Mathur, V K ; Summers, G P

Report Date : 16 Aug 1989

Pagination or Media Count : 15

Abstract : Magnesium oxide sensing material is pretreated and char ged 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 period 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. Patent applications. (rrh)

Descriptors :   *OPTICAL DETECTORS, 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, PATENT APPLICATIONS, ROOM TEMPERATURE, SOURCES, THERMOLUMINESCENCE, ULTRAVIOLET LASERS, ULTRAVIOLET RADIATION

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE