Semiconductor Radiation Detector With Filtered Charge Integration
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Solution Overview
Problem
Current radiation detectors face challenges in achieving high spatial resolution while maintaining efficient radiation absorption, particularly in applications like imaging and non-intrusive inspection, where scintillators compromise between absorption efficiency and spatial resolution.
Innovation Solution
A radiation detector comprising a semiconductor radiation absorption layer with a filter and integrator configuration, utilizing GaAs for improved signal processing and noise attenuation, and a distribution layer for connecting electric contacts, which generates and collects charge carriers to produce electrical signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If scintillators are used for radiation detection, then radiation absorption efficiency is improved, but spatial resolution deteriorates due to light spreading and scattering
Solution Approach 1:
The patent replaces the optical detection mechanism of scintillators with a direct electrical detection mechanism using a semiconductor detector. Instead of converting radiation to light and then detecting the light, the semiconductor detector directly converts radiation into electrical signals through charge carrier generation, eliminating the light spreading and scattering problem that degrades spatial resolution while maintaining radiation absorption efficiency
Solution Approach 2:
The patent changes the detection parameter from optical signal measurement to electrical signal measurement. By using a semiconductor detector that generates electrical signals directly proportional to radiation energy, the system achieves both high spatial resolution (no light spreading) and high radiation absorption efficiency, resolving the fundamental trade-off present in scintillator-based systems
2Measurement precision
If scintillator thickness is reduced to improve spatial resolution, then spatial resolution is improved, but radiation absorption efficiency deteriorates
Solution Approach 1:
The patent replaces the thickness-dependent optical detection system with a semiconductor detection system where electrical signals are collected directly from charge carriers. This substitution allows the detector to maintain high spatial resolution without requiring thin scintillator layers, as the semiconductor material directly converts radiation to electrical signals without light spreading
Solution Approach 2:
The patent employs a composite structure combining a radiation absorption layer with a semiconductor detection layer. This composite material approach allows the system to optimize both radiation absorption (through the absorption layer) and signal collection (through the semiconductor layer), achieving high spatial resolution and high absorption efficiency simultaneously without the trade-off inherent in single-material scintillator systems
3Measurement precision
If filter and integrator are added for signal processing, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent merges the filter and integrator functions into a single integrated electronic signal processing unit that is electrically connected to the semiconductor detector. By combining these signal processing functions into one cohesive electronic system rather than separate physical components, the patent achieves improved signal-to-noise ratio while minimizing the increase in device complexity
Solution Approach 2:
The patent introduces an electronic signal processing intermediary (the filter-integrator circuit) that mediates between the raw electrical signals from the semiconductor detector and the final measurement output. This intermediary electronically processes the signals to enhance signal-to-noise ratio through filtering and integration, adding minimal physical complexity while significantly improving measurement precision
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 detector enhances signal-to-noise ratio and dynamic range, allowing for improved spatial resolution and efficient radiation detection in applications such as radiography, cargo scanning, and computed tomography systems.
Implementation Method 1
When a radiation particle is absorbed in the semiconductor layer, multiple charge carriers (e.g., electrons and holes) are generated
Implementation Method 2
a filter electrically connected to the electric contact and configured to attenuate signals from the electric contact below a first cutoff frequency
Implementation Method 3
an integrator electrically connected to the filter and configured to integrate signals from the filter over a period of time
Implementation Method 4
Semiconductor radiation detectors largely overcome this problem by direct conversion of radiation into electric signals
Data Source
AI summary
Disclosed herein is a detector, comprising: a radiation absorption layer comprising an electric contact; a filter electrically connected to the electric contact and configured to attenuate signals from the electric contact below a first cutoff frequency; an integrator electrically connected to the filter and configured to integrate signals from the filter over a period of time.