Determination Of Width And Luminance Of Cathode-Ray-Tube Trace

Item

Title
Determination Of Width And Luminance Of Cathode-Ray-Tube Trace
Date
1952
Index Abstract
Coming Soon
Photo Quality
Undetermined
Report Number
WADC TR 52-258
Creator
Ranken, Howard B.
Corporate Author
Columbia University
Extent
16
NTRL Accession Number
AD012018
Identifier
AD0012018
AD Number
12018
Access Rights
Unknown
Distribution Classification
1
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
AFAL ltr
Distribution Change Action Date
9/16/2002
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.
Report Availability
Not available via Contrails
Date Issued
1952-09
Index In
DTIC
Type
report