Scatter Imaging System for Density Discrimination
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Solution Overview
Problem
Current x-ray based food inspection systems struggle to accurately detect contaminants and packaging that have similar densities to the food being inspected, compromising their ability to differentiate between materials.
Innovation Solution
A specimen inspection system utilizing an x-ray source and photon detectors positioned at different angles to detect coherent and Compton scattered photons, allowing for discrimination between materials with similar densities by analyzing scattered photons, including the use of Cadmium Telluride or Cadmium Zinc Telluride linear detector arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If x-ray transmission detection is used to inspect food products, then inspection speed and productivity are improved, but the ability to detect contaminants with similar density to food deteriorates
Solution Approach 1:
The system segments the detection process into two independent measurement channels: transmission detection (for productivity) and scatter detection (for precision). By dividing the inspection system into separate detection pathways, each optimized for its specific function, the system maintains high inspection speed while accurately detecting contaminants with similar density to food products.
Solution Approach 2:
The scatter detection system acts as an intermediary measurement method that provides additional information about material composition. Rather than relying solely on transmission detection, the system introduces scatter detection as a complementary measurement that is particularly sensitive to density variations, enabling accurate contaminant detection without compromising inspection speed.
2Measurement precision
If scatter detection at multiple angles is implemented, then material discrimination capability is improved, but device complexity increases
Solution Approach 1:
The system adds the angular dimension to detection by positioning scatter detectors at multiple angles relative to the transmission path. This dimensional expansion enables differentiation of materials based on their scattering characteristics at different angles, providing enhanced material discrimination capability without requiring complex multi-parameter analysis.
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 accurate detection of contaminants and packaging within food products by distinguishing between materials based on their scattering patterns, improving the system's ability to identify differences even when densities are similar, enhancing the overall inspection accuracy.
Implementation Method 1
The means for detecting can detect at least one of coherent scattered photons and Compton scattered photons
Implementation Method 2
The means for detecting can detect at least one of coherent scattered photons and Compton scattered photons
Implementation Method 3
a core material that produces electron-hole pairs in response to interaction with incident photons
Data Source
AI summary
A specimen inspection system includes a photon source for outputting photons along a transmission path and a conveyor for translating a specimen completely through the transmission path. A radiation detector is positioned offset with respect to the transmission path for detecting photons that are scattered from the transmission path in response to interaction with the specimen passing therethrough. A controller determines from the detected scattered photons that a first material is present in the specimen.