Automatic brightness control for image intensifiers
First Claim
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1. Brightness control apparatus for an image intensifier having a photocathode, a microchannel plate, and an anode, comprising:
- monitoring means for monitoring the current drawn by said microchannel plate in response to the light level impinging on said photocathode and for providing a pulse control signal in accordance therewith, andpulse generating means responsive to said pulse control signal for providing a pulse train to said photocathode so that said image intensifier is gated on and off with an on period proportional to said light level impinging on said photocathode.
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Abstract
The microchannel plate current of a microchannel plate image intensifier is sensed to generate a pulse train applied to the image intensifier photocathode for gating the image intensifier on and off with an on period proportional to the light impinging thereon. The off periods of the pulse train are sufficiently positive to repair photocathode spot damage.
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Citations
5 Claims
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1. Brightness control apparatus for an image intensifier having a photocathode, a microchannel plate, and an anode, comprising:
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monitoring means for monitoring the current drawn by said microchannel plate in response to the light level impinging on said photocathode and for providing a pulse control signal in accordance therewith, and pulse generating means responsive to said pulse control signal for providing a pulse train to said photocathode so that said image intensifier is gated on and off with an on period proportional to said light level impinging on said photocathode. - View Dependent Claims (2, 3, 4, 5)
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Specification