High light resolution control of an image intensifier tube

Details High light resolution control of an image intensifier tube High light resolution control of an image intensifier tube

1993-03-01

1994-08-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313537, H01V 4014

Patent

active

053368819

ABSTRACT:
The photocathode of an image intensifier is pulsed ON and OFF at a rate determined by a thyristor or SCR having the anode to cathode path coupled to the photocathode and the gate electrode triggered by a variable resistor, capacitor (RC) circuit to cause the photocathode to draw or conduct current only during the OFF interval of the SCR. During the ON interval of the SCR, the photocathode is OFF or non-conducting, wherein the controlled image intensifier tube exhibits a relatively constant resolution over a wide range of input light input values as from 10.sup.-6 to 10.sup.1 foot-candles.

REFERENCES:
patent: 4134009 (1979-01-01), Dippold
patent: 4926039 (1990-05-01), Garfield et al.
patent: 5146077 (1992-09-01), Caserta et al.

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