Field Emission Source Current Stabilization via Feedback Control
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Solution Overview
Problem
Devices for generating a source current of charge carriers through field emission experience significant fluctuations, which affect the stability of the emission current and the quality of the electromagnetic radiation produced.
Innovation Solution
A device comprising field emission elements, extraction electrodes, and a control system that adjusts the emission current and kinetic energy of charge carriers to stabilize the source current, using a control device to regulate the extraction voltage and variation voltage, thereby reducing fluctuations in the source current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If field emission elements are used to generate source current of charge carriers, then charge carriers can be extracted and used for applications like x-ray generation, but the source current exhibits significant fluctuations affecting stability
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the source current and adjusts the extraction voltage to compensate for fluctuations. The control device receives signals about current variations and modifies the extraction voltage dynamically to maintain stable charge carrier emission, directly addressing the stability issue through closed-loop control.
Solution Approach 2:
The patent changes the extraction voltage parameter in response to detected fluctuations in the source current. By dynamically adjusting this electrical parameter, the system compensates for instability in charge carrier emission, transforming a static extraction voltage into a dynamically controlled variable that actively stabilizes the source current.
2Productivity
If extraction voltage is applied to extract charge carriers from field emission elements, then source current can be generated, but fluctuations in the extraction voltage lead to instability in the source current
Solution Approach 1:
The control device uses feedback from current measurements to regulate the extraction voltage, ensuring that productivity goals are met while maintaining stability. The system monitors the source current and adjusts the extraction voltage in real-time, preventing fluctuations that would otherwise compromise reliability.
Solution Approach 2:
The patent transforms the extraction voltage from a static parameter to a dynamic one that can adapt to changing conditions. The control system enables the extraction voltage to vary smoothly in response to detected fluctuations, allowing the system to maintain both high productivity and stable current generation through continuous adaptation.
3Quantity of substance
If field emission elements operate at high current levels, then sufficient charge carriers are available for applications, but the fluctuations become more pronounced affecting radiation quality
Solution Approach 1:
The feedback control system monitors the source current at high operating levels and provides compensating adjustments to the extraction voltage. This ensures that even when large numbers of charge carriers are emitted, the fluctuations are corrected in real-time, maintaining the precision required for high-quality electromagnetic radiation generation.
Solution Approach 2:
The system dynamically adjusts the extraction voltage parameter to maintain stable emission characteristics at high current levels. By modulating the extraction voltage in response to detected variations, the system preserves radiation quality despite operating with large quantities of charge carriers that would otherwise produce pronounced fluctuations.
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 device achieves a stable source current with a relative standard deviation of less than 1%, enhancing the stability and consistency of the emission current and the generated electromagnetic radiation, particularly suitable for applications like x-ray sources.
Implementation Method 1
The invention relates to a device for generating a source current of charge carriers by means of field emission
Implementation Method 2
The device comprises at least one extraction electrode for applying the extraction voltage, in order to extract the charge carriers from the field emission element
Data Source
AI summary
A device for generating a source current of charge carriers and a method for stabilizing a source current of charge carriers are disclosed. In an embodiment the device includes at least one field emission element configured to emit charge carriers, which lead to an emission current in the field emission element, at least one extraction electrode configured to apply an extraction voltage in order to extract the charge carriers from the field emission element, wherein a first part of the extracted charge carriers contributes to the source current, and a second part of the extracted charge carriers impinges on the extraction electrode and leads to an extraction current in the extraction electrode and a control device configured to reduce fluctuations of a controlled variable Q which is a characteristic for the source current, wherein Q is a function of a difference between the emission current and the extraction current.