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.
Z-axis control loop for cathode-ray tubes
NASA Tech Briefs ; 3 , 3
1979-01-01
Miscellaneous
No indication
English
Glow cathode X-ray tubes in 1932
Engineering Index Backfile | 1932
|High performance applications of cathode-ray tubes
Tema Archive | 1996
|Square Tubes Bent About a Diagonal Axis
British Library Conference Proceedings | 2005
|Applications of the Cathode for Millimeter Wave Tubes
British Library Conference Proceedings | 1996
|German cold cathode tubes : Siemens Reiniger Werke, Rudolstadt
TIBKAT | 1945
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