Segmented Scintillator and Photocathode for High-Resolution Imaging
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Solution Overview
Problem
Current high-energy photon and particle imaging techniques face limitations in resolving power and magnification due to the availability of high-performance optics for high-energy photons and image blurring caused by thick scintillator layers, which also reduce photon conversion efficiency.
Innovation Solution
Integration of optimized photocathode and scintillator layers with specific properties to convert high-energy photons into photoelectrons with low energy and momentum spread, enabling high-sensitivity detection and high-resolution image magnification, using a combination of thin photocathode materials and optimally structured scintillators for efficient photoemission and coherent electron emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a thick scintillator layer is used to increase photon conversion efficiency, then the efficiency of photon conversion is improved, but image blurring increases and resolving power decreases
Solution Approach 1:
The patent divides the scintillator into multiple thin segmented layers separated by reflective barriers, replacing a single thick layer. This segmentation allows each thin layer to convert photons with minimal blurring while the reflective barriers redirect photons that would otherwise be lost, maintaining high conversion efficiency without sacrificing resolution.
Solution Approach 2:
The patent introduces a vertical dimension with multiple stacked scintillator layers separated by reflective barriers, transforming the single-plane conversion process into a multi-layered three-dimensional structure. This enables photons to undergo multiple conversion opportunities as they traverse through different layers, increasing overall efficiency while each individual layer remains thin enough to prevent blurring.
2Measurement precision
If a thinner scintillator layer is used to reduce image blurring, then image resolving power is improved, but photon conversion efficiency decreases
Solution Approach 1:
The patent ensures continuous photon conversion by stacking multiple thin scintillator layers with reflective barriers between them. Photons that pass through the first thin layer without conversion are reflected by the barrier and continue to interact with subsequent layers, ensuring that the useful conversion action continues throughout the entire structure rather than being limited to a single thin layer.
Solution Approach 2:
The reflective barriers act as intermediaries between thin scintillator layers, capturing photons that would otherwise escape and redirecting them into subsequent layers for conversion. These barriers mediate the interaction between photons and scintillator material, enabling efficient conversion across multiple layers while maintaining the thin-layer advantage of reduced blurring.
3Length of stationary object
If the scintillator thickness is reduced to extend depth of field, then depth of field is improved, but signal generation capability is reduced
Solution Approach 1:
The patent segments the scintillator into multiple thin layers, each contributing to signal generation. This segmentation allows the overall structure to achieve an extended effective depth of field comparable to the thin individual layers, while the cumulative signal from multiple layers maintains or enhances the total signal generation capability.
Solution Approach 2:
The patent extends the conversion process into the vertical dimension with multiple stacked layers, allowing photons from a broader depth range to be converted effectively. This multi-layered approach simultaneously achieves extended depth of field and enhanced signal generation by providing multiple conversion opportunities throughout the stacked structure.
4Reliability
If higher energy photoelectrons are emitted to detect higher energy photons, then detection capability is improved, but energy and momentum spread increases causing image blurring
Solution Approach 1:
The patent uses multiple thin scintillator layers to segment the energy conversion process, producing photoelectrons in discrete stages. Each thin layer generates photoelectrons with relatively low energy and narrow momentum spread, and the cumulative effect of multiple layers maintains high detection capability without the severe blurring that would result from a single thick layer producing high-energy photoelectrons.
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
This approach achieves high-resolution imaging by minimizing blurring and maximizing photoemission efficiency, applicable to high-energy photon and particle imaging, including x-ray microscopy and telescopes, with improved performance in EUV and x-ray applications.
Implementation Method 1
a scintillator layer to convert the high-energy photons or particles to lower-energy photons
Implementation Method 2
Conversion of photons to photoelectrons using a photocathode
Data Source
AI summary
Disclosed is an imaging apparatus comprising: a segmented scintillator structure; and a photocathode structure optically coupled to the segmented scintillator structure, for conversion of high-energy particles with an arbitrary spatial distribution to a corresponding distribution of photoelectrons, emitted with a spread in energy ranging from 100 meV to 1 meV. Also disclosed is an imaging apparatus comprising: a segmented scintillator structure, and a photocathode structure optically coupled to the segmented scintillator structure, for conversion of high-energy particles with an arbitrary spatial distribution to a corresponding distribution of photoelectrons, emitted with an angular spread ranging from 10 degrees to 0.1 degrees. Also disclosed is a pressureless filling of capillary tubes and nano-molds using electroosmosis effect.