The effect of duration of light adaptation on time required for detection of a target on a simulated PPI scope
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Report Number: WADC TR 52-259
Author(s): Brown, J. L., Diamond, A. L., Adler, H. E.
Corporate Author(s): Columbia University
Date of Publication: 1952-02
Pages: 28
DoD Task:
Identifier: AD0012969
AD Number: 12969
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.
Author(s): Brown, J. L., Diamond, A. L., Adler, H. E.
Corporate Author(s): Columbia University
Date of Publication: 1952-02
Pages: 28
DoD Task:
Identifier: AD0012969
AD Number: 12969
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.