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A note on luminance calibration of raster-scan cathode-ray tubes: temporal resolution, ripple, and accuracy

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

Accurate luminance calibration is an important issue for stimuli in vision research. Raster-scan cathode-ray tubes present a rapidly scanning spot with a luminance of the order of 10,000 cd m-2 (the actual value depends on video timing and phosphor persistence). With little spatial integration this may result in overloading of the front stage of a photometer. More importantly, even if averaged over hundreds of milliseconds, the pulsed nature of the luminance signal will markedly reduce accuracy of the luminance measurement. A frame-synchronised photometer is described to increase measurement accuracy whilst still rapidly acquiring the result.

Affiliations: 1: Univ.-Augenklinik, Killianstr. 5, D-79106 Freiburg, Germany


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