Rod Scintillator Position Detection via Mirror Reflection
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Solution Overview
Problem
Conventional radiometric measuring devices cannot determine the location of ionizing radiation hits on a rod-shaped scintillator, limiting their ability to provide location-specific information for applications like level measurement in containers.
Innovation Solution
Incorporating an AI unit with machine learning capabilities, such as support vector machines and neural networks, to analyze pulse signals generated by a photodetector, allowing for the determination of the location of ionizing radiation hits by processing signal propagation times and forms within the scintillator, and using a radiation source to generate training data for accurate location identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional rod-shaped scintillator with photodetector is used, then the device structure remains simple, but the location of ionizing radiation hits cannot be determined
Solution Approach 1:
The patent segments the continuous scintillator rod into virtual segments along its longitudinal direction by analyzing time-of-flight information. The evaluation unit divides the rod into multiple position zones and determines which zone received the radiation hit based on signal arrival time, effectively creating spatial segmentation without physical division of the scintillator.
Solution Approach 2:
The patent introduces an optical mirror as an intermediary element positioned at one end of the scintillator rod. This mirror reflects scintillation light back toward the photodetector, creating a time-delayed signal that provides information about the longitudinal position of the radiation interaction. The mirror acts as a mediator that converts spatial information into temporal signal characteristics.
2Loss of information
If total count rate measurement is used, then the measurement process is simple, but location-specific information is lost
Solution Approach 1:
The patent applies dynamic signal processing by analyzing the time-varying characteristics of the electrical signal from the photodetector. The evaluation unit processes the dynamic waveform to extract time-of-flight information, determining the longitudinal position based on when the signal arrives and its temporal profile, thereby recovering location information from the dynamic signal behavior.
Solution Approach 2:
The patent transforms the measurement from a single-dimensional total count rate into a multi-dimensional analysis by introducing the time dimension. By analyzing signal arrival times and temporal characteristics, the system adds spatial localization capability along the longitudinal direction, converting a scalar measurement into a spatially-resolved measurement.
3Measurement precision
If no mirror is used, then the device structure is simpler, but location determination along the longitudinal direction is not possible
Solution Approach 1:
The patent utilizes the periodic or repeated reflection of light by the mirror to create multiple signal paths with different time delays. The mirror reflects scintillation light back toward the photodetector, creating a time-delayed signal that provides information about the longitudinal position. This optical path multiplication enables position determination through temporal analysis of the reflected signals.
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
Enables reliable and accurate determination of the location of ionizing radiation hits, facilitating precise level measurement in containers by analyzing pulse shapes and count rates along the scintillator's longitudinal direction, enhancing the device's measurement capabilities beyond traditional total count rate measurements.
Implementation Method 1
a rod-shaped scintillator (1), wherein a photodetector (2) is optically coupled to a first end (1a) of the rod-shaped scintillator (1)
Implementation Method 2
a photodetector (2) in the form of a photomultiplier, and with a mirror (3) being disposed at a second end (1b) of the rod-shaped scintillator (1)
Implementation Method 3
the mirror (3) is disposed at a second end (1b) of the rod-shaped scintillator (1), and with the second end (1b) being opposite the first end (1a)
Data Source
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AI summary
Radiometric measuring device (100) comprising: - a rod-shaped scintillator (1), - a photodetector (2), - a mirror (3), - wherein the photodetector (2) is optically coupled to a first end (1a) of the rod-shaped scintillator (1), and - wherein the mirror (3) is arranged at a second end (1b) of the rod-shaped scintillator (1), the second end (1b) being opposite the first end (1a), and - an evaluation unit (4) coupled to the photodetector (2) and configured to determine, based on a pulse (IP) generated by the photodetector (2), a location (B) in the longitudinal direction (x) of the rod-shaped scintillator (1) at which a particle of ionizing radiation causing the pulse (IP) has struck the rod-shaped scintillator (1).