Coded-Source X-Ray Laminography for HME Detection
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Solution Overview
Problem
Current HME detection systems rely on human interpretation of 2D images from active X-ray radiography and require sampling for chemical detection, which is inefficient and burdensome, posing a significant threat from potential terrorist activities.
Innovation Solution
A fast, coded-source, x-ray computed laminography system that detects material composition by the ratio of transmitted characteristic X-rays, enabling motion-free 3D geometrical details and automatic detection of HME using a coded X-ray beam and microprocessor analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If active X-ray radiography systems are used to form 2D transmission images, then imaging capability is provided, but human operator interpretation is required which increases operational burden and reduces productivity
Solution Approach 1:
The system performs self-diagnosis by automatically analyzing the transmitted characteristic X-ray signals to detect HME materials. The microprocessor system autonomously processes the detected signals and determines the presence of explosives without requiring human operator interpretation, thereby eliminating operational burden while maintaining detection accuracy
Solution Approach 2:
The patent replaces the mechanical human interpretation process with an automated microprocessor-based analysis system. The microprocessor automatically processes the characteristic X-ray signals, applies detection algorithms, and determines HME presence, substituting human cognitive operations with electronic processing to increase throughput while preserving detection capability
2Loss of information
If chemical detection systems such as mass spectrometry are used, then additional information about container contents is provided, but sampling is required which bottlenecks the transit system
Solution Approach 1:
The system enables continuous detection by eliminating the sampling step. The characteristic X-ray source continuously illuminates the container contents, and the detector continuously receives transmitted signals for analysis. This continuous operation removes the time bottleneck associated with discrete sampling operations while maintaining complete material composition information
Solution Approach 2:
The system performs detection without requiring preliminary sampling actions. The characteristic X-rays directly penetrate and interact with the container contents in situ, obtaining material composition information without the need for prior sample collection, preparation, or transfer operations that would consume time
3Productivity
If automatic detection is implemented to relieve operator burden, then productivity increases, but system complexity may increase
Solution Approach 1:
The microprocessor system serves multiple functions: it processes characteristic X-ray signals, identifies HME materials, and can potentially detect other substances. This multi-functionality consolidates what could be multiple separate systems into one integrated device, increasing productivity while managing complexity through functional integration
Solution Approach 2:
The system uses characteristic X-ray energies as distinctive parameters for material identification. By measuring and analyzing specific energy parameters of transmitted X-rays, the system achieves automatic detection through quantitative analysis rather than qualitative human assessment, enabling productivity improvement through programmable parameter-based 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
Automatically detects HME, reducing the burden on human operators, improving screening reliability, and minimizing the threat of HME smuggling by providing accurate, 3D imaging of container contents.
Implementation Method 1
X-rays are generated by accelerating electrons and impinging them on a thin metal plate; typically tungsten
Implementation Method 2
X-rays emitted in a broad spectrum produce distinct photo-peaks or characteristic X-rays dependent on the electronic structure of the metal atoms in the plate
Implementation Method 3
By measuring the transmission of the characteristic X-rays through an object, information regarding the objects elemental composition can be obtained
Implementation Method 4
Motion-free 3-Dimensional geometrical details are obtained through computed laminography imaging techniques
Data Source
AI summary
A homemade explosives (HME) detection system provides a coded-source, x-ray computed laminography imaging system which detects material composition by the ratio of the transmitted characteristic X-rays within a coded x-ray beam. Motion-free 3-Dimensional geometrical details are obtained through computed laminography imaging techniques.