Variable gain image intensifier

Details Variable gain image intensifier Variable gain image intensifier

1998-07-27

2000-11-21

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214LA, G02B 2300

Patent

active

061506508

ABSTRACT:
A method for providing user adjustable variable gain for a night vision device which utilizes an image intensifier tube, wherein the image intensifier tube has a given life expectancy, the image intensifier tube is subjected to factory calibration for providing an optimum output during operation, wherein the calibration undesirably differs from tube to tube and is adjustable by variable control means coupled to the tube, whereby when one tube is substituted for another the difference in calibration causes non-optimum performance, the method including the steps of: determining minimum and maximum gain limits associated with the optimum output of the night vision device; factory calibrating gain limiting means according to the determined minimum and maximum gain limits, wherein the gain limiting means are associated with the image intensifier tube and for limiting the variable control means; and, tethering the gain limiting means to the image intensifier tube.

REFERENCES:
patent: 5283427 (1994-02-01), Phillips et al.
patent: 5644425 (1997-07-01), Palmer
patent: 5737131 (1998-04-01), Palmer
patent: 5867313 (1999-02-01), Schweitzer et al.
patent: 5943174 (1999-08-01), Bryant et al.

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