Radiation Absorption Coefficient Analysis for Liquid Security Inspection
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Solution Overview
Problem
Current security-inspection methods for liquid articles in aviation, such as chemical, electromagnetic, and neutron detection, are inadequate for quick and accurate identification due to high false alarms, environmental interference, and residual radiation issues, while X-ray 2D imaging and 3D CT technologies fail to provide sufficient evidence for liquid article detection.
Innovation Solution
A method and device using radiation beams to acquire multi-angle projection data, compute radiation absorption coefficients, and compare them with preset data to obtain quantitative information about liquid articles, employing a radiation source, carrier mechanism, detection appliance, and computer processor to analyze geometry boundary information and uniformity, enabling quick and non-destructive detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If X-ray 2D imaging technology is used, then the imaging speed is fast, but the detection precision is insufficient due to one-dimensional information loss
Solution Approach 1:
The patent transitions from 2D projection imaging to 3D CT reconstruction by acquiring multi-angle projection data and reconstructing cross-sectional images. This dimensional transformation recovers the lost spatial information, enabling precise localization and characterization of liquid articles while maintaining rapid scanning capability through optimized projection acquisition
2Measurement precision
If three-dimensional CT technology is used, then the detection precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent employs a multi-functional integrated system where a single X-ray source and detector assembly performs both 2D projection imaging and 3D CT scanning functions. The same hardware platform supports different detection modes (pack inspection and liquid article detection), reducing overall device complexity and cost while maintaining high detection precision through software-based reconstruction algorithms
Solution Approach 2:
The system performs preliminary 2D projection imaging to obtain geometric boundary information, which is then used as constraints in the subsequent 3D reconstruction process. This preliminary action reduces the complexity of full 3D reconstruction by providing prior knowledge about object boundaries, enabling faster and more accurate liquid article detection
3Measurement precision
If chemical method is used, then the detection precision is high, but the detection time is too long for quick inspection
Solution Approach 1:
The patent replaces chemical analysis methods with physical X-ray imaging and 3D reconstruction techniques. Instead of requiring time-consuming chemical reactions and laboratory analysis, the system uses non-contact X-ray projection and rapid CT reconstruction to achieve equivalent or superior detection precision within seconds, enabling quick security inspection
4Speed
If electromagnetic method is used, then the detection speed is fast, but the reliability decreases due to interference from metal packages
Solution Approach 1:
The patent changes the detection parameter from electromagnetic properties (dielectric constant) to radiation absorption coefficients. X-ray radiation penetrates metal packages effectively, and the absorption coefficient is a fundamental property of liquids that remains consistent regardless of packaging. This parameter change eliminates interference from metal containers while maintaining fast detection speed and high reliability
5Measurement precision
If neutron detection method is used, then the detection precision is high, but the safety issues arise due to residual radiation
Solution Approach 1:
The patent converts the potential harm of radiation by using X-ray imaging in a controlled manner. Instead of employing neutron activation which leaves residual radiation, the system uses conventional X-ray technology with built-in safety features including interlock systems, dose monitoring, and optimized exposure parameters. The radiation is used beneficially for detection while minimizing any potential harm through proper shielding and operational controls
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 provides a compact, accurate, and reliable security-inspection system that is suitable for aviation and other critical sites, offering high safety and reliability with easy shielding, capable of distinguishing liquid articles without destroying their outer packages.
Implementation Method 1
emitting radiation beams to transmit through the liquid articles; receiving the radiation beams through the liquid articles to form multi-angle projection data
Implementation Method 2
computing a radiation absorption coefficient of the liquid articles by an inverse operation of the multi-angle projection data
Data Source
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AI summary
Disclosed is a method and a device for security-inspection of liquid articles with radiations, which relate to the field of radiation inspection technology. The method comprises steps of acquiring original environment information, emitting radiation beams to transmit the liquid articles, receiving the radiation beams transmitted through the liquid articles to form multi-angle projection data, computing a radiation absorption coefficient of the liquid articles to be detected by inverse operation of the multi-angle projection data, based on the initial environmental information and the uniformity of the liquid articles, and comparing the radiation absorption coefficients with the preset data to get the relevant information of the liquid articles. Comparing with the prior art, the present invention is not subjected to affection of outer package of the liquid article, and is advantageous of high anti-jamming, high accuracy, high safety and reliability, low cost and small size.