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Pulsed Illumination Projector.
Patent, Filed 19 Nov 84, patented 5 Jan 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
This patent discloses a pulsed illuminator projector for reducing the reverberation levels of reflected light by illuminating a lamp that is pulsed on and off at a specified rate and for a specified time duration. The critical factor is controlling the amount of time the light is on versus amount of time it is off, and the frequency at which the lamp is pulsed on. The pulsed illumination projector device reduces the amount of backscatter from particulate matter such as water, zooplankton, dust, fog, and the like which causes a significant amount of light to reflect back toward the source thereby reducing visibility. Backscatter is reduced through the reduction of direct incident light. As the backscatter is reduced, the distance which objects can be detected is increased. Illumination is controlled directly by pulse length and repetition rate. The device is completely portable and can be hand held item as well as mounted on a vehicle and operable in gaseous or liquid atmosphere. JHD
APPROVED FOR PUBLIC RELEASE