The Purkinje after-image evoked by the sweep moving across cathode-ray tube screens was investigated. Threshold values for the disappearance of the image at low intensities of retinal illumination were found to vary from 0.61 to 15.5 photons for P-7 and P-11 phosphors. Threshold values for the high intensities at which the image completely disappears were found to be at about 200-250 photons, when the image loses its complimentary hue and becomes a faint achromatic trace. The threshold at which the remaining image disappears was about 1000 photons. (Author)
The Purkinje After-Image on Screens of Cathode-Ray Tubes
1951
14 pages
Report
Keine Angabe
Englisch
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