Particle Detection Circuit Subpixel Segmentation
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Solution Overview
Problem
Conventional particle detection circuits face limitations in detecting high particle fluxes due to dead time, leading to pile-up phenomena and reduced spatial resolution, especially when the particle flux is high.
Innovation Solution
The circuit is enhanced by incorporating summing circuits connected in series between the input and output of basic circuits within each pixel, allowing for selective resetting and division of pixels into subpixels, which reduces the effective dead time and increases the countability of particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional counting circuits are used with standard pixel configuration, then the circuit structure is simple, but the particle flux detection capability is limited due to dead time and pile-up phenomena
Solution Approach 1:
Each pixel is divided into multiple subpixels, with each subpixel having its own summing circuit and counter. This segmentation allows parallel processing of particle events across multiple subpixels within the same pixel, effectively increasing the particle flux detection capability while maintaining counting accuracy through distributed counting channels
Solution Approach 2:
The patent introduces a temporal dimension to the counting process by implementing summing circuits that accumulate counts over defined time periods. This temporal integration allows the system to handle high particle fluxes by processing events across time intervals rather than requiring simultaneous processing, thereby resolving the dead time limitation
2Reliability
If the dead time is reduced to handle high particle flux, then the counting accuracy improves, but the pile-up phenomenon becomes more precocious and paralyzes the system
Solution Approach 1:
By dividing each pixel into multiple subpixels with independent counters, the system distributes the particle flux load across multiple channels. This segmentation prevents any single counter from becoming paralyzed by high flux, maintaining system availability while preserving counting accuracy through multiple active counting paths
Solution Approach 2:
The summing circuit merges the count outputs from multiple subpixels to produce a unified pixel count. This merging occurs after individual subpixel counting, allowing each subpixel to operate independently with reduced dead time impact, while the combined output maintains high counting accuracy through aggregated data from multiple channels
3Measurement precision
If pixels are grouped to increase signal-to-noise ratio for weak fluxes, then the detection sensitivity improves, but the spatial resolution is downgraded
Solution Approach 1:
The patent implements a hierarchical structure where pixels are segmented into multiple subpixels, each capable of independent counting. This segmentation allows flexible grouping of subpixels to achieve desired signal-to-noise ratios while maintaining the ability to resolve individual subpixel positions, thereby preserving spatial resolution even when grouping is applied for weak flux detection
Solution Approach 2:
The system dynamically adjusts the grouping of subpixels based on particle flux conditions. For weak fluxes, subpixels can be grouped to enhance signal-to-noise ratio, while for stronger fluxes, individual subpixel resolution is maintained. This dynamic reconfiguration allows the system to optimize between sensitivity and spatial resolution based on real-time conditions
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 configuration enables the detection of higher particle fluxes with maintained spatial resolution, effectively delaying the pile-up phenomenon and improving counting efficiency by reducing the quantity of pulses managed by each basic circuit.
Implementation Method 1
detector element transforming the detected particles into electrical pulses
Data Source
AI summary
The particle detection circuit comprises a plurality of basic circuits. Each basic circuit comprises a particle detector element connected to an associated counter and a summing circuit having a first input connected to the output of the counter. Basic circuits, each forming a subpixel, are grouped together by series connection of their summing circuits to form a pixel. The output of the pixel, formed by the output of the summing circuit of a last basic circuit of the pixel, supplies counting signals representative of the number of particles detected by the set of basic circuits of the pixel. Disabling certain basic circuits of the pixel, by selective zero resetting of the first input of their summing circuit, can enable only the particles detected by certain zones of the pixel to be counted.