Accession Number : ADD014562

Title :   Thermal Image Dynamic Range Expander.

Descriptive Note : Patent, Filed 6 May 85 patented 6 Jan 87,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Metcalf, Travis W

Report Date : 06 Jan 1987

Pagination or Media Count : 9

Abstract : A gas cell array absorbs infrared energy radiated by a viewed scene. A laser interferometer has its resultant intensity changed by the cell's changing length. This is monitored by a vidicon tube that feeds the signal to a digitizer and onto a video display. The incident infrared radiation is chopped into quantized amounts of energy and memory units receive the digitized output of the vidicon tube. Subtractors receive vidicon tube signals simultaneously with quiescent reference levels data. The subtractors form a difference signal by subtracting the quiescent reference level signal from the immediate extended dynamic range of 1,000:1 is accomplished for the preferred embodiment. Keywords: Patents. (jhd)

Descriptors :   *DYNAMIC RANGE, *INFRARED IMAGES, *GAS CELLS, *PATENTS, *TELEVISION DISPLAY SYSTEMS, ANALOG TO DIGITAL CONVERTERS, ARRAYS, INFRARED RADIATION, LASERS, LEVEL(QUANTITY), MEMORY DEVICES, OPTICAL INTERFEROMETERS, VIDEO SIGNALS, VIDICONS

Subject Categories : Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE