An active infra-red surveillance illuminator uses a statistically mono-directional micro-diffractive material overlaid on a bank of light emitting diodes (LEDs) to refract light from the LEDs onto a target image. This delivers energy distribution profiles out to a distance to match the aspect ratios of current wide-angle target and wide-angle camera surveillance systems. The distribution of refracted light is elliptical. This distribution can vary by using different diffractive material in conjunction with various numbers, brightness and angles of the LEDs in an LED bank. The effective range of the illuminators is greatly extended with this type of illumination. By limiting infrared (IR) radiation down to a 10 degree vertical window it renders the IR illumination much more effective for surveillance imaging by providing much more effective power on wide, ground-level scenes, and particularly enables multi-lane license plate capture.
MICRO-DIFFRACTIVE SURVEILLANCE ILLUMINATOR
MIKRODIFFRAKTIVE ÜBERWACHUNGSBELEUCHTUNGSEINRICHTUNG
ILLUMINATEUR DE SURVEILLANCE MICRO-DIFFRACTIF
2019-11-20
Patent
Electronic Resource
English
IPC: | F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF , Funktionsmerkmale oder Einzelheiten von Leuchten oder Beleuchtungssystemen / F21K Nicht-elektrische Lichtquellen unter Verwendung von Lumineszenz , NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES / G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS / H04N PICTORIAL COMMUNICATION, e.g. TELEVISION , Bildübertragung, z.B. Fernsehen / H05B ELECTRIC HEATING , Elektrische Heizung |
Transmission line behavior of the hardness surveillance illuminator
Tema Archive | 1990
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