Microchannel Plate Voltage Compensation for Night Vision Gain Drift
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Solution Overview
Problem
Night vision devices face challenges in maintaining performance and controlling the gain of image intensifier tubes under varying temperature conditions and extended usage, leading to inconsistent output brightness and efficiency.
Innovation Solution
A digitally controlled power supply that adjusts control voltages for the microchannel plate based on temperature changes and usage time, using a processor, chronometer, and temperature sensor to compensate for environmental and operational stress, ensuring consistent performance across temperature extremes and prolonged use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the night vision device operates under varying temperature conditions and extended usage without compensation, then the device structure remains simple, but the output brightness and gain become inconsistent
Solution Approach 1:
The patent implements feedback control by continuously monitoring the control voltage applied to the microchannel plate and comparing it against reference values. When drift is detected (caused by temperature changes or extended usage), the system automatically adjusts the control voltage to maintain proper gain. This closed-loop feedback mechanism ensures performance consistency without requiring complex hardware modifications.
Solution Approach 2:
The patent dynamically changes the control voltage parameter applied to the microchannel plate based on detected drift conditions. By adjusting this electrical parameter in response to temperature and usage variations, the system maintains optimal electron multiplication and output brightness without physical modifications to the intensifier tube structure.
2Reliability
If temperature compensation is applied continuously, then the output brightness remains consistent, but the energy consumption increases
Solution Approach 1:
The patent employs periodic monitoring and compensation rather than continuous adjustment. The system checks the control voltage at intervals and applies compensation only when drift exceeds predetermined thresholds. This periodic approach maintains output brightness consistency while significantly reducing the energy consumption compared to continuous active compensation.
3Reliability
If the control voltage is adjusted frequently to compensate for temperature changes, then the gain consistency improves, but the device wear increases
Solution Approach 1:
The patent applies preliminary compensation adjustments before significant drift occurs by monitoring temperature trends and proactively adjusting the control voltage. This preventive approach maintains gain consistency while minimizing the frequency of large corrections, thereby reducing stress on the power supply and electronic components and extending device service life.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution maintains consistent output brightness and gain of the night vision device across temperature ranges and usage time, preventing degradation and ensuring reliable performance under diverse conditions.
Implementation Method 1
determining an amount of compensation to apply to the control voltage based on a change to the control voltage attributed to a change in temperature of an operating environment of the night vision device
Implementation Method 2
determining whether the night vision device has been used for a predetermined amount of time
Implementation Method 3
adjusting the control voltage in accordance with the amount of compensation to obtain a compensated control voltage
Implementation Method 4
As the electrons bombard the input surface of the MCP, secondary electrons are generated within the MCP. That is, the MCP may generate several hundred electrons for each electron entering the input surface
Implementation Method 5
Visible and infrared energy, for example, may impinge upon the photocathode and be absorbed in the cathode active layer, thereby resulting in generation of electron/hole pairs
Data Source
AI summary
A method of controlling the performance of a night vision device includes supplying, by a power supply, to a microchannel plate of a light intensifier tube, a control voltage that controls a gain of the microchannel plate, determining an amount of compensation to apply to the control voltage based on a change to the control voltage attributed to a change in temperature of an operating environment of the night vision device, adjusting the control voltage in accordance with the amount of compensation to obtain a compensated control voltage, and supplying, by the power supply, the compensated control voltage to the microchannel plate of the light intensifier tube. The method may further include determining whether the night vision device has been used for a predetermined amount of time, and only after that predetermined amount of time, is the method configured to supply the compensated control voltage.