Ultra-fast X-ray Source for Stand-off Material Interrogation
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Solution Overview
Problem
Conventional X-ray sensor systems face limitations in penetrating containers to detect materials inside due to two-dimensional output interference from container walls and atmospheric scattering, requiring complex and costly tomography methods to achieve three-dimensional profiling.
Innovation Solution
The use of ultra-fast X-ray sources, such as table-top X-ray lasers or ultra-fast laser-initiated X-ray tubes, with collimating optics for range-gated characterization, allowing for the isolation of target signals from container and atmospheric interference, enabling three-dimensional mapping and identification of materials behind barriers or within containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional X-ray sensor systems are used for penetration detection, then the ability to detect materials through containers is improved, but the output is limited to two-dimensional information which loses depth profile data
Solution Approach 1:
The patent employs periodic pulsed X-ray emission instead of continuous emission. The X-ray source emits short pulses (e.g., nanosecond to picosecond duration) separated by intervals, allowing the detector to gate signals temporally. This periodic action enables depth resolution by measuring time-of-flight of backscattered photons, recovering the depth profile information lost in conventional continuous X-ray systems.
Solution Approach 2:
The patent transitions from two-dimensional spatial imaging to three-dimensional imaging by adding the time dimension. By measuring the time-of-flight of backscattered photons and incorporating depth information, the system creates a third dimension (depth/range) beyond the conventional two-dimensional detector plane, enabling volumetric reconstruction of materials within containers.
2Measurement precision
If conventional X-ray systems operate in continuous mode, then detection coverage is improved, but background noise from atmospheric scattering increases
Solution Approach 1:
The system uses periodic pulsed X-ray emission with gateable detection. The detector is synchronized to open only during the expected arrival time window of backscattered photons from the target, rejecting photons arriving at other times. This temporal gating dramatically reduces background noise from atmospheric scattering and other sources while maintaining detection coverage.
3Measurement precision
If tomography methods are used to achieve three-dimensional profiling, then depth resolution is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical tomography systems (requiring multiple X-ray sources, detectors, and precision positioning mechanisms like goniometers) with a single pulsed X-ray source and detector combination. The time-of-flight measurement provides depth information without mechanical movement or complex multi-angle scanning, dramatically simplifying the system while achieving three-dimensional profiling.
Solution Approach 2:
The system uses the natural time-of-flight of photons as a self-organizing mechanism for depth encoding. Photons traveling different distances naturally arrive at different times, providing automatic depth discrimination without requiring external mechanical scanning or complex computational tomography algorithms. The system leverages the inherent temporal properties of light propagation.
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 and identification of materials like explosives within sealed containers without the need for complex infrastructure, reducing radiation exposure and improving detection fidelity by isolating target signals, thus overcoming the limitations of conventional X-ray systems.
Implementation Method 1
an ultra-fast X-ray source (incoherent and/or X-ray laser) with an ultra-short pulse emission for the illumination of a target
Implementation Method 2
detecting one or more of photons, electrons and/or positrons emitted from the target, or transmitted through the target
Implementation Method 3
Laser induced active sensing techniques such as fluorescence
Data Source
AI summary
Methods and apparatus for a stand-off interrogation system having an ultra-fast X-ray source (incoherent and/or X-ray laser) with an ultra-short pulse emission to irradiate a target material behind a barrier. In one embodiment, the target material is an explosive material in a container. The composition of the target material is directly determined from the detected elemental differential back-scattering signatures.