Semiconductor X-ray Detector Direct Conversion Heat Management
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Solution Overview
Problem
Current semiconductor X-ray detectors face challenges in heat management, making it difficult to produce large-area detectors with a large number of pixels, and they often require cumbersome heat management systems.
Innovation Solution
The proposed semiconductor X-ray detector design includes an X-ray absorption layer with an electrode, voltage comparators, a counter, and a controller that manages time delays and voltage thresholds to register and measure X-ray photons, eliminating the need for a scintillator and optimizing heat management through a capacitor module and electrical grounding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor X-ray detectors use direct conversion of X-ray into electric signals, then spatial resolution is improved, but heat management becomes cumbersome and difficult for large-area detectors
Solution Approach 1:
The patent extracts and removes the scintillator component from the detector system, using direct conversion semiconductor material that converts X-ray photons directly into electrical signals without requiring intermediate light conversion. This eliminates the complex heat management requirements associated with scintillator-based systems while maintaining high spatial resolution through direct charge carrier generation and collection at pixel electrodes.
Solution Approach 2:
The patent replaces the mechanical/thermal management system required for scintillators with an electrical field-based direct conversion system. Instead of using scintillator materials that require heat sinks and thermal management infrastructure, the system uses semiconductor materials where X-ray absorption directly generates electrical signals that can be managed through electronic circuits rather than thermal management systems.
2Measurement precision
If scintillator thickness is reduced to improve spatial resolution, then spatial resolution is improved, but X-ray absorption efficiency decreases
Solution Approach 1:
The patent changes the fundamental detection parameter from optical photon detection (scintillator light emission) to direct electrical signal detection. By using semiconductor materials with high atomic number elements that directly convert X-ray photons into charge carriers, the system achieves both high spatial resolution and high absorption efficiency without the thickness compromise required in scintillator systems. The direct conversion mechanism allows thin detector layers to maintain high quantum efficiency.
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 design enables efficient detection of X-ray photons, improves spatial resolution, and reduces heat management complexities, allowing for the production of large-area detectors with multiple pixels without cumbersome heat management systems.
Implementation Method 1
Semiconductor X-ray detectors largely overcome this problem by direct conversion of X-ray into electric signals. A semiconductor X-ray detector may include a semiconductor layer that absorbs X-ray in wavelengths of interest. When an X-ray photon is absorbed in the semiconductor layer, multiple charge carriers (e.g., electrons and holes) are generated and swept under an electric field towards electrical contacts on the semiconductor layer.
Implementation Method 2
a first voltage comparator configured to compare a voltage of the electrode to a first threshold; a second voltage comparator configured to compare the voltage to a second threshold; a counter configured to register a number of X-ray photons absorbed by the X-ray absorption layer
Implementation Method 3
wherein the controller is configured to start a time delay from a time at which the first voltage comparator determines that an absolute value of the voltage equals or exceeds an absolute value of the first threshold; wherein the controller is configured to activate the second voltage comparator during (including the beginning and the expiration) the time delay
Data Source
AI summary
Disclosed herein is an apparatus comprising: a radiation absorption layer comprising an electrode; a counter configured to register a number of radiation particles absorbed by the radiation absorption layer; a controller configured to start a time delay from a time at which an absolute value of an electrical signal on the electrode equals or exceeds an absolute value of a first threshold; wherein the controller is configured to cause the number registered by the counter to change, in response to the absolute value of the electrical signal equaling or exceeding an absolute value of a second threshold during the time delay.