Cascaded Image Intensifier Ion Protection
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Solution Overview
Problem
Image intensifier tubes face degradation issues due to ion-caused damage and reduced photon output, which affect the signal-to-noise ratio and lifetime, particularly in cascaded systems where degradation in the first section impacts overall performance.
Innovation Solution
A cascaded image intensifier design with multiple sections, where the first section includes a reducing element to mitigate ion-caused degradation and reduce photon output, while the last section compensates to maintain or exceed the original photon output levels, using a bulk scintillator or varying voltage differences to protect the photocathode and extend the system's operational life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single section image intensifier is used with high voltage (20-30 KV) to maximize photon output, then the photon output is maximized, but the photocathode unit suffers from ion-caused degradation reducing lifetime
Solution Approach 1:
The image intensifier is divided into multiple sections (first section with reducing element and second section without). The first section operates at lower voltage (6-10 KV) to protect the photocathode from ion damage, while the second section operates at higher voltage (20-30 KV) to maximize photon output. This segmentation allows each section to optimize for its specific function, resolving the contradiction between photocathode protection and photon output maximization.
Solution Approach 2:
The reducing element acts as an intermediary component in the first section that mitigates ion-caused degradation of the photocathode. By introducing this intermediate protective element, the system can operate the first section at lower voltage, reducing ion damage while still maintaining overall system performance through the cascaded second section.
2Productivity
If the first section operates at high voltage (20-30 KV) to maximize photon output, then the photon output is maximized, but the ion-caused degradation increases reducing system lifetime
Solution Approach 1:
The system is segmented into two functional sections: the first section operates at lower voltage (6-10 KV) with a reducing element to extend lifetime, while the second section operates at higher voltage (20-30 KV) to maximize photon output rate. This segmentation resolves the contradiction by distributing different operational requirements to different sections.
Solution Approach 2:
The voltage parameter is changed between sections - the first section uses lower voltage (6-10 KV) to reduce ion damage and extend lifetime, while the second section uses higher voltage (20-30 KV) to maximize photon output rate. This parameter change strategy allows the system to achieve both extended lifetime and high productivity.
3Duration of action of stationary object
If a reducing element is added to the first section to protect the photocathode, then the photocathode lifetime is extended, but the number of photons exiting the first section is reduced
Solution Approach 1:
The system is segmented into two sections where the first section (with reducing element) prioritizes photocathode protection and operates at lower voltage, while the second section compensates for the reduced photon output by operating at higher voltage. The cascaded architecture ensures that the final photon output meets or exceeds the original single-section performance while extending photocathode lifetime.
Solution Approach 2:
The reducing element, which initially appears to reduce photon output from the first section, actually provides a benefit by extending photocathode lifetime. The cascaded second section then compensates for the reduced output, converting the apparent harm (reduced first section output) into a benefit (extended system lifetime with maintained overall performance).
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 cascaded design effectively prolongs the lifetime of the image intensifier by reducing ion-induced degradation and maintaining photon output, ensuring consistent signal quality and throughput in applications like automatic inspection systems.
Implementation Method 1
The photocathode unit converts incoming photons to electrons which are accelerated by an electric field (potential difference) in the tube until they hit the screen unit converting them back to photons
Implementation Method 2
electrons which are accelerated by an electric field (potential difference) in the tube until they hit the screen unit converting them back to photons
Implementation Method 3
wherein a screen unit in the first section includes a bulk scintillator
Data Source
AI summary
A cascaded image intensifier device is presented. In one embodiment the device comprises: at least two sections in cascade, each of a first section and a last section out of the at least two sections including a photocathode unit adapted to convert photons to electrons and a screen unit adapted to convert electrons to photons; wherein the first section includes a reducing element adapted to: (i) reduce ion-caused degradation of a photocathode unit of the first section, and (ii) reduce a number of photons exiting from the first section from a first value to a second value; and wherein the last section outputs a number of photons that equals or exceeds the first value. Also disclosed are methods and systems using the disclosed cascaded image intensifier device.