Persistence Filtering in Single-Photon Detector Arrays
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Solution Overview
Problem
High-speed imaging systems using single-photon detectors face challenges in accurately distinguishing between genuine photon detections and false positives caused by thermal noise and ambient light, leading to inefficiencies in processing speed and spatial resolution.
Innovation Solution
Implementing a persistence condition where detection signals must be consistently positive across multiple observation windows to confirm genuine photon incidences, thereby filtering out false positives and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity of single-photon detectors is increased to capture more photons, then the photosensitivity improves, but false positives increase due to thermal noise and ambient light
Solution Approach 1:
The patent applies preliminary action by requiring multiple detection events (at least two photons) before confirming a genuine signal. This pre-condition filtering mechanism eliminates false positives from thermal noise and ambient light that would otherwise be indistinguishable from genuine photon detections, thus resolving the contradiction between high sensitivity and reliability
Solution Approach 2:
The patent implements feedback through a verification mechanism where detection signals are evaluated against a threshold condition (multiple photons required). This feedback loop confirms genuine signals by requiring consistent detection across multiple observation windows, thereby reducing false positives while maintaining high photosensitivity
2Productivity
If the processing time is reduced to achieve higher voxel rates, then the imaging speed improves, but the ability to filter false positives deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-defining detection thresholds and evaluation criteria that are checked in real-time during photon detection. This allows the system to rapidly filter false positives without requiring complex post-processing, thus maintaining high voxel rates while ensuring reliable detection
Solution Approach 2:
The patent changes the detection parameter from single-photon sensitivity to multi-photon confirmation threshold. By requiring at least two photons within a specific time window, the system achieves both high processing speed and effective false positive filtering, resolving the contradiction between productivity and reliability
3Measurement precision
If the spatial resolution is increased by using more detectors, then the image quality improves, but the computing power required increases
Solution Approach 1:
The patent extracts and removes false positive signals through a filtering mechanism that evaluates detection signals against predefined criteria. By eliminating spurious detections before further processing, the system reduces the computational burden on subsequent image reconstruction algorithms, thus allowing high spatial resolution with manageable computing requirements
Solution Approach 2:
The patent changes the detection confirmation parameter from single-event to multi-event validation. This parameter change significantly reduces the number of false positives that would otherwise require computational resources to process, enabling high-resolution imaging with reduced computing power requirements
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 significantly reduces false positives, enhancing the speed and accuracy of high-speed imaging by ensuring only confirmed photon incidences are processed, thereby improving voxel rate and spatial resolution.
Implementation Method 1
single-photon detectors (SPD), whereby false positives are filtered out of the results
Data Source
AI summary
The present invention relates to a system, detector element and method for high-speed imaging with SPD arrays, and a calibration routine for SPD arrays.