Dynamic X-ray Filter Wheel for Cargo Inspection
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Solution Overview
Problem
Current security scanning systems using high-energy X-radiation for inspecting cargo and vehicles often operate at suboptimal intensity due to radiation dose limits, resulting in unnecessary high radiation levels and reduced cargo penetration capabilities.
Innovation Solution
A scanner system with a filter wheel and processing system that dynamically adjusts X-ray beam intensity by varying the timing of radiation pulses and filter section alignment, utilizing a rotatable filter wheel with radially extending spokes and filter blocks of different thicknesses to optimize radiation penetration based on real-time detection data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the X-ray source intensity is set to the highest level allowable (Output Set Point) to ensure sufficient cargo penetration, then the cargo inspection capability is improved, but the radiation dose to the driver and unnecessary radiation exposure increases
Solution Approach 1:
The filter wheel is made rotatable to dynamically adjust which filter section is positioned in the X-ray beam path. The processing system varies the timing of radiation pulses to coincide with different filter sections, enabling real-time optimization of radiation intensity based on cargo characteristics, thus reducing unnecessary radiation exposure while maintaining sufficient penetration capability
Solution Approach 2:
Different filter sections with varying thicknesses and/or materials are introduced to change the radiation parameters. By selecting appropriate filter sections, the system adjusts the effective X-ray intensity to match the actual penetration requirements of different cargo types, preventing both over-exposure and under-penetration
2Object-affected harmful factors
If the X-ray source intensity is reduced to lower radiation dose limits, then the safety for driver and reduction of unnecessary radiation is improved, but the cargo penetration capability deteriorates
Solution Approach 1:
The filter wheel is divided into multiple discrete filter sections, each with specific attenuation characteristics. This segmentation allows the system to select the precise level of radiation attenuation needed for different cargo types, rather than using a single fixed filter or no filter, enabling optimization between safety and penetration
Solution Approach 2:
The filter wheel rotates periodically to present different filter sections to the X-ray beam in sequence. The radiation pulses are timed to coincide with specific positions in this periodic cycle, allowing the system to apply different filtration levels for different inspection requirements while maintaining continuous operation
3Device complexity
If a fixed filter wheel position is used to maintain constant radiation intensity, then the system complexity is reduced, but the adaptability to different cargo types deteriorates
Solution Approach 1:
The filter wheel transitions from a static fixed position to a dynamic rotatable mechanism controlled by the processing system. This dynamic control enables the system to adapt to different cargo types by selecting appropriate filter sections, while the automation of the control process minimizes the operational complexity for the user
Solution Approach 2:
The processing system varies the timing of radiation pulses based on detection data and cargo characteristics to select the appropriate filter section. This feedback mechanism allows the system to automatically adapt to different inspection requirements without requiring manual intervention, balancing adaptability with operational simplicity
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 allows for optimized X-ray beam intensity adjustment, reducing unnecessary radiation exposure and enhancing cargo penetration capabilities while maintaining safety within radiation dose limits.
Implementation Method 1
each of the filter blocks is made up of a number of sections of different thicknesses
Data Source
Figure 1~4
Figure 5~6
AI summary
A scanner system comprises: a radiation generator arranged to generate radiation to irradiate an object, the radiation generator comprising a radiation source arranged to produce radiation and a filter arranged to provide variable filtering of the radiation from the source; detection means arranged to detect the radiation after it has interacted with the object and generate a sequence of detector data sets as the object is moved relative to the generator, and processing means arranged to process each of the detector data sets thereby to generate a control output arranged to control the radiation generator so as to vary the filtering, thereby to vary the radiation output by the radiation generator as the object is scanned.