Forward Scatter X-ray Detection for Long-Range Security Imaging
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Solution Overview
Problem
Current x-ray inspection systems face challenges in maintaining image quality at larger distances due to reduced backscattered flux, especially when detecting organic materials concealed within or behind significant amounts of high-Z materials like steel, and are inadequate for security applications requiring longer ranges.
Innovation Solution
A system utilizing a collimated beam of penetrating radiation with a concealed source and detectors positioned to capture both direct transmission and forward scatter signals, allowing for enhanced imaging and detection of metallic and organic content at greater distances, including the use of a spatial modulator and deployment of detectors in various configurations such as speed bumps or on vehicles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distance between the inspection system and the object increases, then the security application requirement is met, but the image resolution and quality decrease
Solution Approach 1:
The patent transitions from detecting backscattered x-rays (backward direction) to detecting forward-scattered x-rays (forward direction), fundamentally changing the detection dimension. This allows the detector to be positioned at a distance from the object while still capturing sufficient scattered flux, resolving the contradiction between distance and image quality
2Measurement precision
If the flux of x-ray source increases to counteract decrease in image quality, then the image quality is maintained, but the object exposure increases posing safety problems
Solution Approach 1:
The patent changes the detection parameter from backscatter angle to forward scatter angle, and modifies the energy spectrum selection to optimize the signal-to-noise ratio at distance. This allows maintaining image quality with lower flux by detecting in the forward direction where scattered flux is more abundant at range
3Measurement precision
If detectors are positioned adjacent to the x-ray source to maintain high image quality, then the image quality is high, but the system cannot be used at larger distances required for security applications
Solution Approach 1:
The patent positions the detector to subtend a large solid angle in the forward direction relative to the object, rather than adjacent to the source. This geometric configuration allows the detector to capture sufficient forward-scattered flux from distant objects, enabling security applications at larger distances while maintaining image quality
4Measurement precision
If the size of detectors is increased to counteract decrease in image quality at larger distances, then the image quality is maintained, but the detectors become impractically large
Solution Approach 1:
The patent optimizes the detector size and positioning parameters to subtend an optimal solid angle in the forward direction. By detecting forward scatter rather than backscatter, the system achieves adequate signal collection with practical detector sizes at distance, avoiding the need for impractically large detectors
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 enables effective detection of security threats at longer ranges with improved image quality and reduced exposure, capable of distinguishing between metallic and organic content even when concealed within metal containers, and allows for flexible deployment in various scenarios.
Implementation Method 1
When the beam hits the object, scattered X-rays are captured by x-ray detectors
Implementation Method 2
the use of a spatial modulator and deployment of detectors in various configurations
Data Source
AI summary
Systems and methods for inspecting an object with a scanned beam of penetrating radiation are disclosed. Scattered radiation from the beam is detected, in either the backward or forward direction. Characteristic values of the backscattered radiation are compared to expected reference values to characterize the object. Additionally, penetrating radiation transmitted through the inspected object may be combined with scatter information. In certain embodiments, the inspected field of view is less than 0.1 steradians, and the detector is separate from the source of penetrating radiation and is disposed, with respect to the object, such as to subtend greater than 0.5 steradians in the field of view of the object.