NASA NTRS · 19780000305
Z-axis control loop for cathode-ray tubes
Abstract
Inexpensive PIN diode detector samples screen brightness between camera frames generating error signal for feedback control of intensity. System was tested by taking flat-field exposures at several density levels over 4 hour period. Results showed processed film density levels varied by less than + or - 10 percent usually centering around + or - 8 percent.
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Ray, A. J., Jr.. 1979-01-01. Z-axis control loop for cathode-ray tubes. https://ntrs.nasa.gov/citations/19780000305
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