X-band Linear Accelerator for Compact Cargo Scanning
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Solution Overview
Problem
Conventional cargo inspection systems face challenges with bulky and heavy radiation sources due to the need for thick shielding, and radioactive sources pose safety hazards and transportation issues, while linear accelerators are complex and require electronic control for operation.
Innovation Solution
A compact scanning system using a high-frequency linear accelerator with programmable gain integrating amplifiers to adjust radiation pulse frequency and energy, allowing for variable sensitivity and efficient imaging of objects from small containers to large trucks, with a switching gain integrator circuit to manage dynamic range and minimize radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional linear accelerators are used for cargo inspection, then radiation penetration capability is improved, but the size and weight of the system increases due to bulky shielding requirements
Solution Approach 1:
The patent changes the operating frequency parameter of the linear accelerator from conventional S-band (low frequency) to X-band (high frequency). This parameter change enables a more compact accelerating structure that requires less thick radiation shielding, thereby reducing the overall system weight while maintaining adequate radiation penetration capability for cargo inspection
Solution Approach 2:
The patent implements dynamic control of the linear accelerator operation by using feedback from detector signals to adjust beam parameters and control the number of pulses integrated. This dynamic operation allows the system to achieve required penetration capability only when necessary, reducing the need for excessive shielding and associated weight
2Ease of manufacture
If radioactive sources are used for lower cost installations, then system cost is reduced, but safety hazards and transportation issues arise
Solution Approach 1:
The patent replaces the mechanical/shutter-based control system of radioactive sources with an electronic control system for the linear accelerator. The accelerator can be turned on and off electronically without physical shutters, eliminating the safety hazards associated with manual shutter mechanisms while maintaining cost-effectiveness for the application
Solution Approach 2:
The patent uses a linear accelerator that can be powered down completely when not in use, effectively replacing the permanently active radioactive source. The accelerator produces radiation only when electrically activated, creating a 'short-living' radiation source that is inherently safer and eliminates transportation restrictions associated with radioactive materials
3Device complexity
If linear accelerators operate at low frequency S-band, then system complexity is reduced, but the wavelength is longer resulting in larger system size
Solution Approach 1:
The patent changes the fundamental operating frequency parameter from S-band to X-band, which directly reduces the wavelength of the microwave energy used in the linear accelerator. This parameter change proportionally reduces the physical length of the accelerating structure and associated waveguide components, creating a more compact system
4Device complexity
If fixed gain amplifiers are used in detection means, then system simplicity is improved, but the ability to handle varying radiation levels and optimize sensitivity is reduced
Solution Approach 1:
The patent implements dynamic, programmable gain control in the integrating amplifiers of the detection means. The gain can be adjusted based on the detected signal levels and imaging requirements, allowing the system to optimize sensitivity for different detection scenarios while maintaining manageable complexity through software-based control
Solution Approach 2:
The patent uses feedback from the detector signals to control the gain of the integrating amplifiers. The system monitors the detected radiation levels and adjusts the amplification accordingly, enabling automatic optimization of detection sensitivity without requiring complex manual calibration or multiple fixed-gain stages
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
The system achieves efficient and safe imaging with reduced size and weight, enabling effective penetration and minimizing radiation dose, while allowing for precise control of radiation pulses to optimize imaging quality and safety.
Implementation Method 1
a radiation source (12) arranged to direct pulses of radiation towards an object (14)
Implementation Method 2
irradiates with X-rays or gamma-rays through the object under inspection
Implementation Method 3
detection means (16) arranged to detect the radiation wherein the detection means includes a plurality of detector banks arranged to produce a detector signal in response to detection of the radiation
Implementation Method 4
acquisition means comprising a plurality of programmable gain integrating amplifiers each connected to a bank of detectors arranged to generate a data signal from the detector signal
Data Source
Figure 1~2
Figure 3~4
Figure 5(a)~9
AI summary
A scanning system comprises a radiation source arranged to direct radiation towards an object, a detection means arranged to detect the radiation, and control means arranged to control the source so that it produces pulses of radiation, to define a check condition, to process signals from the detection means to determine whether they meet the check condition, and to vary the pulses dependent on whether the signals meet the check condition.