Real-Time Configurable Backscatter Scanner for Vehicle Inspection
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Solution Overview
Problem
Existing vehicle inspection systems using x-ray backscatter technology face challenges in maintaining acceptable image quality and adhering to radiation dose regulations, especially when vehicles exceed nominal speeds or vary in dimensions.
Innovation Solution
The system employs a backscatter imaging system with a source array of discrete sources, which are selectively activated at frequencies determined by the vehicle's speed. This approach maintains radiation dose and image quality within acceptable limits, while also optimizing scanning to only include the vehicle, thus reducing unnecessary exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the radiation source is configured to allow for a maximum radiation dose for a given nominal inspection driving speed, then the radiation dose is controlled within regulatory limits at nominal speed, but drivers may not drive at the nominal inspection driving speed, resulting in excess dose at lower speeds
Solution Approach 1:
The system dynamically adjusts the radiation source configuration in real-time based on the actual vehicle speed detected by sensors. The control system continuously monitors speed and modifies source parameters (such as pulse width, duty cycle, or intensity) to maintain the radiation dose within regulatory limits across varying speed conditions, rather than using a fixed configuration for a single nominal speed.
Solution Approach 2:
The system incorporates speed sensors and feedback control mechanisms that continuously monitor the vehicle's actual speed and adjust the radiation source operation accordingly. This closed-loop control ensures that the radiation dose remains within legal limits regardless of whether the vehicle travels at speeds lower than, equal to, or higher than the nominal inspection speed.
2Productivity
If the vehicle drives at higher speeds, then scanning throughput is improved, but image quality deteriorates due to lower doses resulting in dark areas
Solution Approach 1:
The system dynamically adjusts radiation source parameters in real-time based on detected vehicle speed. When vehicles travel at higher speeds, the system increases the radiation source intensity or adjusts pulse characteristics to compensate for the reduced interaction time, thereby maintaining image quality and preventing dark areas while still achieving high scanning throughput.
Solution Approach 2:
The system changes operational parameters of the radiation source (such as tube current, voltage, pulse width, or duty cycle) based on the vehicle's speed. By adjusting these parameters dynamically, the system maintains optimal image quality across a range of speeds, ensuring that both high throughput and high image quality can be achieved simultaneously.
3Reliability
If the complete span of the vehicle is scanned, then all areas are inspected, but sub-optimal image quality and excess dose to environment result
Solution Approach 1:
The system applies local quality by adjusting the radiation source configuration based on the specific dimensions and characteristics of the vehicle being inspected. Rather than using a fixed scanning pattern for all vehicles, the system adapts the scan parameters (such as source position, beam width, and scanning pattern) to match the actual vehicle size, thereby reducing radiation dose to the environment while maintaining complete inspection coverage.
Solution Approach 2:
The system changes scanning parameters (such as source-to-object distance, beam width, scanning speed, and source configuration) based on detected vehicle dimensions. This adaptive approach allows the system to optimize the balance between inspection completeness and radiation dose for each specific vehicle type, reducing unnecessary exposure while ensuring all critical areas are inspected.
4Object-affected harmful factors
If traditional backscatter systems are used, then low dose to passengers is achieved, but scanning speed depends on the driver and can vary widely, resulting in higher doses
Solution Approach 1:
The system uses feedback from speed sensors to continuously monitor and adjust the scanning process. By knowing the actual vehicle speed in real-time, the system can compensate for variations in driving speed by adjusting radiation source parameters, thereby maintaining consistent radiation dose levels regardless of whether the driver drives slowly or quickly.
Solution Approach 2:
The system dynamically adjusts radiation source operation based on real-time speed data. When the vehicle travels slower than expected, the system increases the radiation source intensity or adjusts pulse characteristics to prevent dose accumulation. When the vehicle travels faster, the system相应ly adjusts parameters to maintain the correct dose rate, thereby decoupling the scanning process from driver speed variations.
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 solution enables higher vehicle speeds with maintained image quality and reduced radiation exposure, improving scanning efficiency and effectiveness while adhering to regulatory limits.
Implementation Method 1
One method is to use backscatter technology, which produces photo-like images. Since the penetration is low compared with transmission radiography
Implementation Method 2
X-rays are typically used because they penetrate the vehicles and allow seeing contraband concealed within the car
Implementation Method 3
backscatter technology, which produces photo-like images
Data Source
AI summary
Described herein are systems and methods for backscatter imaging. A backscatter imaging system configurable in real-time for imaging an object is provided. The backscatter imaging system includes a source array including a plurality of discrete sources, and a collimator array including a plurality of collimators corresponding to the plurality of discrete sources. The source array is configured to selectively activate the plurality of discrete sources at a frequency that is determined based at least in part on a speed of the object relative to the backscatter imaging system.