Quote:
Originally Posted by Telecolor 3007
Is true that "R.C.A." TK-41 needed to reach stability and they needed a lot of light in order to deliver a good image?
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The recommended level for the TK-41 was about 400 foot-candles (4300 lux). Later ultrasensitive image orthicons could reduce this by 2:1 or more.
All photoemissive photocathodes were temperature senstitive and sensitive to their history of use. It seems that any substance with a low work function (gives up electrons easily from light stimulation) was also not chemically very stable.
The image orthicon secondary emission target performance was also temperature sensitive, and subject to burn-in of images.
04-28-2012, 11:23 AM
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