Multi-Window Signal Processing for Photon Counting
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Solution Overview
Problem
Radiation counting detectors face issues such as undesirable electronic noise, inability to accurately equalize volts per keV between channels, and limited adjustment capabilities in signal processing electronics, restricting their versatility in various applications.
Innovation Solution
A multi-window signal processing electronics architecture that includes a radiation detector element, an amplifier, a gain equalization circuit, comparators with independently adjustable trigger threshold signals, and counters that increment based on the peak of the gain-adjusted amplified signal exceeding specific thresholds, allowing for accurate counting and storage of radiation events across multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiation counting detectors use fixed gain and threshold settings, then the device structure is simple, but the ability to accurately equalize volts per keV between channels is poor
Solution Approach 1:
The patent implements dynamic adjustment of gain and threshold parameters through programmable voltage-controlled amplifiers and variable threshold generators. Each channel's amplifier gain can be independently controlled via voltage inputs, and threshold levels are dynamically set through programmable voltage sources, allowing real-time equalization of volts per keV across multiple channels while maintaining systematic architecture.
2Adaptability or versatility
If radiation counting detectors use fixed signal processing parameters, then the device is easier to manufacture, but the adaptability to various applications is limited
Solution Approach 1:
The patent employs programmable parameter control where amplifier gains, threshold levels, and integration times can be modified through voltage inputs and digital programming. The system includes variable gain amplifiers controlled by voltage inputs, programmable threshold generators, and configurable integration circuits, enabling the same detector architecture to be adapted to different radiation types, energy ranges, and application requirements without physical redesign.
3Measurement precision
If radiation counting detectors lack independent threshold adjustment per channel, then the device complexity is reduced, but the measurement precision and equalization capability deteriorate
Solution Approach 1:
The patent divides the threshold control system into independent per-channel variable threshold generators, where each detector channel has its own programmable threshold setting. This segmentation allows independent optimization of threshold levels for each channel based on specific detection requirements, enabling precise channel equalization while maintaining modular architecture that simplifies overall system design.
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 solution enables accurate calibration and equalization of signal gains and thresholds, reducing electronic noise and enhancing the system's versatility, leading to improved performance and flexibility in detecting radiation events across different applications.
Implementation Method 1
a radiation detector element operative for outputting a signal having an amplitude related to an energy of a radiation event received thereby
Data Source
AI summary
A radiation detection and counting system (2) includes a radiation detector element (5) for outputting a signal related to an energy of a radiation event received thereby and an amplifier (8) for amplifying the signal output by the detector element (5). A gain equalization circuit (10) adjusts the gain of the amplified output signal and a plurality of comparators (12) compare the gain adjusted amplified output signal to a like plurality of different valued threshold signals that are independently adjustable of each other A plurality of counters (20) is operative whereupon only the counter associated with the one comparator (12) that changes state in response to the peak of the gain adjusted amplified output signal exceeding the value of the trigger threshold signal thereof is incremented. A storage (24) stores the incremented value of each counter (20) accumulated over a sample time interval and data output logic circuit (26) transfers the stored accumulated counts out of the storage.