Accession Number : ADD013085

Title :   Hydraulic Automatic Light Control.

Descriptive Note : Patent, Filed 24 Jun 82, patented 29 Jan 85,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Woods,Charles E

Report Date : 29 Jan 1985

Pagination or Media Count : 4

Abstract : An improved, controlled automatic light control device is provided by the use of a hydraulic automatic light control. Hydraulic control avoids inherent problems of mechanical automatic light control devices. A liquid used for light adsorption permits the entire iris area to darken without loss of aperture. The uniform extinction without diffraction limitations of mechanically driven automatic light control devices is significantly improved. The use of thermoelectric coolers and heat sinks provides reliability in a large dynamic range environment without warping or other distortion of the system. The device is applicable for visible light to near infrared light. (Patents)

Descriptors :   *PATENTS, *DIFFRACTION, *HYDRAULICS, *NEAR INFRARED RADIATION, *HYDRAULICS, *IRIS, *LIGHT, ADSORPTION, AUTOMATIC, CONTROL, DISTORTION, DYNAMIC RANGE, EXTINCTION, HEAT SINKS, INFRARED RADIATION, LIMITATIONS, RELIABILITY, THERMOELECTRIC COOLING, VISIBILITY

Subject Categories : Optics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE