Accession Number : AD0012969


Title :   THE EFFECT OF DURATION OF LIGHT ADAPTATION ON TIME REQUIRED FOR DETECTION OF A TARGET ON A SIMULATED PPI SCOPE


Corporate Author : COLUMBIA UNIV NEW YORK


Personal Author(s) : BROWN, JOHN L ; DIAMOND, A L ; ADLER, HELMUT E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/012969.pdf


Report Date : Dec 1952


Pagination or Media Count : 27


Abstract : The time necessary for the detection of a target on a simulated PPI scope was determined for various scope luminances after different durations of light adaptation to a luminance of 3100 mL. Target detection time increases with an increase in the duration of light adaptation up to a maximum value which varies with scope luminance. In general, detection time decreases with either an increase in target luminance or a decrease in background luminance for a given duration of light adaptation. Within the range investigated, changes in target luminance result in a greater change in detection time than comparable changes in background luminance. The implication for radar-scope viewing after adaptation to a high luminance was that optimum visibility will be obtained with a maximum gain and as much negative bias as is possible without appreciable reduction of target luminance.


Descriptors :   *OPTICAL DETECTION , *VISUAL PERCEPTION , OPTIMIZATION , TARGETS , REDUCTION , TIME , VISIBILITY , GAIN , BACKGROUND , TARGET DETECTION , BIAS , LUMINANCE , ADAPTATION(PHYSIOLOGY)


Subject Categories : Optical Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE