Accession Number : AD0697169

Title :   LIMITATIONS IN OPTICAL IMAGING DEVICES AT LOW LIGHT-LEVELS,

Corporate Author : SIGNALS RESEARCH AND DEVELOPMENT ESTABLISHMENT CHRISTCHURCH (ENGLAND)

Personal Author(s) : Richards,E. A.

Report Date : JAN 1969

Pagination or Media Count : 26

Abstract : An examination is made of the influence of objective lens parameters on the resolution capabilities of low light-level imaging devices. From the resulting characteristics the dependence of the perception range of a given target on the incident light-level is deduced. The restrictions imposed by larger lenses on the depth-of-field of acceptable focus are investigated, and comparisons made with the thresholds set by quantum-noise and optical resolution limitations. Degradations in the performance of image-intensifiers due to different levels of image-tube darknoise are also discussed. (Author)

Descriptors :   (*NIGHT VISION, LOW LIGHT LEVELS), (*OPTICAL IMAGES, RESOLUTION), THRESHOLDS(PHYSIOLOGY), VISUAL PERCEPTION, IMAGE INTENSIFIERS(ELECTRONICS), LENSES, FOCUSING, OPTIMIZATION, QUANTUM STATISTICS, GREAT BRITAIN

Subject Categories : Optical Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE