Accession Number : ADD006873
Title : Passive High-Speed Automatic Shutter for Imaging Devices.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Rast,Howard E , Jr
Report Date : 04 Dec 1979
Pagination or Media Count : 9
Abstract : A passive, high-speed, automatic shutter for controlling the transmission of light energy of known wavelengths along a predetermined optical axis is provided to protect imaging devices against sudden, undesirable optical overload which may cause damage. A large plurality of contiguously positioned micro-channel optical waveguides is axially aligned parallel with the optical axis to intercept the light energy. The large plurality of micro-channel optical waveguides provides desirable maximization of resolution for transmitting the image to the imaging device. When the determinable level of intensity is not exceeded, optical images are transmitted through the large plurality of micro-channel waveguides to the imaging device which may desirably by positioned in an off-axis, angular disposition. However, when the determinable level of intensity of the known wavelengths of light energy is exceeded, the large plurality of micro-channel optical waveguides including the saturable absorber material becomes effectively transparent and transmits all such light energy along its initial optical axis so that the excess level of intensity of light energy does not reach the off-axis imaging device.
Descriptors : *Patents, *Shutters(Optics), *Optical waveguides, Protective equipment, Overload, Automatic, High speed cameras, Optical images
Subject Categories : Optical Detection and Detectors
Distribution Statement : APPROVED FOR PUBLIC RELEASE