Intensity-Modulated X-Ray Source for Cargo Inspection
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Solution Overview
Problem
Conventional X-ray cargo inspection systems operate at fixed intensity, often exceeding the necessary level for penetration, leading to inefficient radiation usage and increased exposure, while failing to utilize the maximum intensity capabilities of the source, thus requiring a system that can deliver minimum X-ray intensity for effective imaging and penetration.
Innovation Solution
An intensity-modulated X-ray source that adjusts X-ray intensity on a pulse-to-pulse basis using a feedback loop, based on signal strengths from the detector array, allowing for dynamic adjustment of peak current to optimize penetration while maintaining a reduced radiation footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fixed high intensity X-ray source is used to ensure sufficient penetration, then penetration capability is improved, but radiation exposure and shielding requirements increase
Solution Approach 1:
The X-ray source intensity is made dynamically adjustable rather than fixed. The system modulates the peak current of the X-ray source on a pulse-to-pulse basis according to real-time feedback from detector signals, allowing the intensity to adapt to the actual penetration needs of different cargo densities and compositions.
Solution Approach 2:
A feedback control loop is implemented where detector array signals are continuously monitored and used to adjust the X-ray source intensity. The system measures the transmitted X-ray signals and uses this information to modulate the source output, ensuring optimal penetration while minimizing unnecessary radiation exposure.
2Strength
If fixed high intensity X-ray source is used to ensure sufficient penetration, then penetration capability is improved, but system efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts X-ray source intensity to match the actual penetration requirements of each inspected cargo. By modulating the peak current based on feedback signals, the system delivers the minimum necessary intensity for adequate imaging, avoiding the waste of using consistently high intensity for all inspections.
Solution Approach 2:
The peak current parameter of the X-ray source is varied dynamically during operation. The system changes the intensity parameter according to the specific inspection needs detected by the detector array, optimizing the balance between penetration capability and energy consumption for each inspection scenario.
3Strength
If higher energy X-ray source is used to improve penetration, then penetration capability is improved, but shielding weight increases
Solution Approach 1:
The system uses dynamic intensity modulation to achieve sufficient penetration with lower average radiation levels. This allows the use of lighter shielding materials or reduced shielding thickness while maintaining safety standards, as the peak intensity is delivered only when and where needed rather than continuously.
Solution Approach 2:
The system applies partial action by delivering high intensity X-rays only when and where penetration is actually needed, rather than using continuous high intensity. This reduces the overall radiation burden and allows for reduced shielding requirements while maintaining adequate penetration capability for dense cargo when necessary.
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 enhances imaging penetration by up to 5 cm of steel-equivalent while reducing the average radiation footprint by a factor of 1 to 3, allowing for the use of higher energy sources in mobile applications with reduced shielding weights, thereby improving efficiency and safety.
Implementation Method 1
The X-ray source comprises a linear accelerator
Implementation Method 2
The linear accelerator is based on an electron gun
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The present invention is directed toward an X-ray scanning system having a plurality of detectors and a controller, where a) the controller is configured to receive and identify a minimum X-ray transmission level detected by at least one detector, b) the controller compares the minimum X-ray transmission level to at least one predetermined threshold transmission level, and c) based on said comparison, the controller generates an adjustment signal. The present invention further comprises an X-ray source, where the X-ray source receives an adjustment signal and is configured to adjust an X-ray pulse duration based on the adjustment signal.