Determination Of Width And Luminance Of Cathode-Ray-Tube Trace
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Report Number: WADC TR 52-258
Author(s): Ranken, Howard B.
Corporate Author(s): Columbia University
Date of Publication: 1952-09
Pages: 16
DoD Task:
Identifier: AD0012018
AD Number: 12018
Abstract:
A method is described for specifying CRT traces in terms of visual measures of width and central luminance. Trace width is measured with an image doubler which produces 2 parallel images of the CRT trace; width is defined in terms of the distance between the centers of the 2 images when they just appear to merge. Central luminance of the trace is measured with a magnifying system in conjunction with a Macbeth illuminometer. The magnifier produces a real image of the trace sufficiently enlarged to fill the field of the Macbeth. Matching is performed in the usual way; the appropriate conversion factor is applied to the Macbeth reading. Estimates of intra-observer and inter-observer variability are given for width and luminance measures. The method of measuring central luminance is compared experimentally with an alternative method involving a direct monocular match.
Author(s): Ranken, Howard B.
Corporate Author(s): Columbia University
Date of Publication: 1952-09
Pages: 16
DoD Task:
Identifier: AD0012018
AD Number: 12018
Abstract:
A method is described for specifying CRT traces in terms of visual measures of width and central luminance. Trace width is measured with an image doubler which produces 2 parallel images of the CRT trace; width is defined in terms of the distance between the centers of the 2 images when they just appear to merge. Central luminance of the trace is measured with a magnifying system in conjunction with a Macbeth illuminometer. The magnifier produces a real image of the trace sufficiently enlarged to fill the field of the Macbeth. Matching is performed in the usual way; the appropriate conversion factor is applied to the Macbeth reading. Estimates of intra-observer and inter-observer variability are given for width and luminance measures. The method of measuring central luminance is compared experimentally with an alternative method involving a direct monocular match.