Accession Number : ADD001863

Title :   Charge Coupled Radiation Detector Imaging System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Greene,Richard F

Report Date : 25 Mar 1975

Pagination or Media Count : 5

Abstract : The invention provides a device for suppression of the effects of element to element inhomogeneity in an infrared charge coupled image device. Basically, the CCD arrangement is altered so that two charge storage buckets instead of one are used for each element of the infrared scene. First, the scene is optically defocussed so that a first bucket records the average light intensity multiplied by the electro-optic sensitivity of that element. Next, this recorded charge is shifted to a second bucket and stored. This stored charge represents the electro-optic response to a uniform defocussed scene and therefore is a record of the inhomogeneity itself. Finally, the scene is focussed so that the actual image element is recorded in the first bucket together with the unavoidable element inhomogeneity. This homogeneity is removed by subtracting the signal stored in the first bucket from the signal in the second bucket. This subtraction is performed by a pair of matched capacitors at the end of the CCD register. This is done for each electro-optic element along the register in sequence until the data is shifted out.

Descriptors :   *Infrared detectors, *Infrared images, *Patents, Charge coupled devices, Photoconductors

Subject Categories : Electrical and Electronic Equipment
      Infrared Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE