Accession Number : ADD009188

Title :   Beam Position Locater with Photodetector Array.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Smith,Kenneth L

Report Date : 05 Jan 1982

Pagination or Media Count : 8

Abstract : An apparatus for accurately detecting and digitally displaying the centrum of the location where a luminous energy beam impinges a shift register scanned linear photodetector array. With the commencement of the array scan, clock pulses corresponding to successive photodiodes are accumulated in a counter, continuing until an illuminate photodiode, with a video response above the detection threshold, is encountered. Thereafter, clock pulses are locked out while only alternate video pulses reach the counter. The onset of the succeeding scan locks out the video pulses, leaving the counter display at the previously accumulated count for an extended period defined by a supplemental sample timing circuit. The sampling of scans provides a display sufficiently stable for visual monitoring. (Author)

Descriptors :   *Patents, *Photodetectors, *Beam steering, *Arrays, Shift registers, Position(Location), Photodiodes, Detectors, Linear systems, Digital systems, Pulses, Inventions, Visual surveillance, Video signals, Energy, Counting methods, Luminosity, Scanning, Timing circuits, Response

Subject Categories : Electrical and Electronic Equipment
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE