Microlens Array Optical Imaging for Ionizing Particle Detection
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Solution Overview
Problem
Existing detectors for ionizing particles, such as gamma cameras, require substantial doses of radioactive material and have high electrical consumption and costs, with limited spatial resolution and sensitivity.
Innovation Solution
A detector using a microlens array to focus photons emitted by a scintillator onto an imager, allowing for optical transmission of information and enabling three-dimensional imaging of ionizing particle traces with improved spatial resolution and sensitivity, reducing the need for numerous measuring channels and costly components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collimator with thin tubes is used to improve spatial resolution, then spatial resolution is improved, but the quantity of photons received by the scintillator decreases
Solution Approach 1:
The patent replaces the mechanical collimator system (physical tubes) with an optical imaging system consisting of a scintillator coupled to an imager. This substitution eliminates the need for physical collimation structures that block photons, allowing all photons to reach the scintillator while maintaining spatial resolution through optical imaging techniques.
Solution Approach 2:
The patent changes the detection parameter from direct photon counting through collimator tubes to measuring the position and intensity of scintillation light. By detecting the spatial distribution of scintillation photons and calculating their barycentre, the system achieves spatial resolution without the photon loss inherent in collimator-based systems.
2Measurement precision
If silicon strip or pixel detectors are used to achieve high spatial resolution, then spatial resolution is improved, but the number of measuring channels and electrical consumption become prohibitive
Solution Approach 1:
The patent merges the functions of multiple individual detectors into a single integrated imager. Instead of requiring separate measuring channels for each spatial element, the system uses one imager to detect all scintillation photons simultaneously, with spatial information extracted through image processing and barycentre calculation.
Solution Approach 2:
The patent creates an optical copy of the scintillation event rather than using direct electrical sensing. The imager captures the spatial distribution of scintillation light as an optical image, which is then processed to determine particle position and energy, replacing the need for numerous electrical measuring channels.
3Measurement precision
If silicon strip or pixel detectors are used to achieve high spatial resolution, then spatial resolution is improved, but the cost of the system becomes prohibitive
Solution Approach 1:
The patent employs a cost-effective imager technology that is less expensive than silicon strip or pixel detectors. By using commercially available imager components coupled with the scintillator, the system achieves comparable spatial resolution at a lower cost, making the detector more economically viable.
4Measurement precision
If drift chamber detectors are used to detect particle traces, then spatial resolution is improved, but the device becomes bulky and requires gas containment infrastructure
Solution Approach 1:
The patent replaces the bulky mechanical drift chamber system with a compact scintillator-imager assembly. Instead of using large volumes of gas and complex electrode structures, the system uses a solid or liquid scintillator coupled to a flat imager, dramatically reducing the device volume while maintaining spatial resolution through optical detection.
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 achieves significantly enhanced sensitivity, around 100 times better than prior art, with improved spatial resolution and reduced electrical consumption, allowing for precise localization of ionizing particles and reduced radioactive material doses.
Implementation Method 1
A scintillator capable of emitting photons when ionizing particles pass therethrough
Implementation Method 2
A first microlens array, each microlens of the first microlens array being arranged such as to produce an image of the trace of the ionizing particles by focusing the photons emitted in the scintillator on the first imager
Data Source
AI summary
A detector for detecting the traces of ionizing particles includes a scintillator capable of emitting photons when ionizing particles pass therethrough; a first imager capable of detecting each photon emitted by the scintillator, and a first microlens array, each microlens of the first microlens array being arranged such as to produce an image of the trace of the particles by focusing the photons emitted in the scintillator on the first imager.