Vapor Sampling Card for Non-Invasive Threat Substance Screening
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Solution Overview
Problem
Current methods for screening freight cargo containers for threat substances, such as x-ray imaging and non-imaging techniques, are bulky, expensive, and prone to high false alarms, with low detection limits and interference from non-threat substances, posing hazards and inefficiencies.
Innovation Solution
A non-invasive method involving direct air sampling from within containers using a stainless steel sampling card with adsorbent/absorbent materials to trap vapors and particles, which are then analyzed for threat substances without opening the containers, utilizing high-volume vacuum sampling and thermal desorption for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If x-ray imaging systems are used to screen container content, then images can be generated for examination, but the systems are bulky, expensive, and require skillful operators with high false alarm rates
Solution Approach 1:
The invention extracts the detection function from complex x-ray imaging systems and concentrates it in a portable vapor detection device. Instead of imaging the entire container content, the system extracts volatile substances from the container atmosphere and analyzes only those vapors, simplifying the device while maintaining detection capability for threat substances.
Solution Approach 2:
The invention replaces the mechanical/optical x-ray imaging system with a chemical detection system based on vapor sampling and analysis. Instead of using x-rays to image physical structures, the system uses chemical sensors to detect volatile substances, substituting a complex mechanical imaging system with a simpler chemical analysis approach.
2Reliability
If x-ray imaging is used to screen container content, then threat substances can be detected, but the content may be damaged and operators exposed to hazards
Solution Approach 1:
The invention introduces air vapor as an intermediary medium between the container content and the detection system. Instead of directly imaging or contacting the container content with x-rays, the system samples the vapor phase that naturally exists in the container atmosphere. This intermediary approach allows detection without direct interaction with or damage to the physical cargo.
3Measurement precision
If non-imaging screening techniques with nuclear probing beams are used, then threat substances can be detected, but detection limits are low and interference from non-threat substances occurs
Solution Approach 1:
The invention applies local quality by using selective vapor sampling and analysis focused on specific threat substance categories. The system targets volatile substances with characteristic vapor signatures, allowing localized detection of explosives, narcotics, and other threat substances without the broad but inaccurate scanning of nuclear probing methods. This selective approach improves both sensitivity and accuracy.
4Productivity
If non-imaging screening techniques are used to screen container content, then screening can be performed, but the systems are large, complex, and expensive with slow screening rates
Solution Approach 1:
The invention segments the screening process into discrete functional modules: vapor sampling, vapor transport, and vapor analysis. This segmentation allows each component to be optimized independently and enables the use of portable, simplified devices rather than requiring large complex installations. The modular approach maintains screening effectiveness while reducing system complexity and increasing productivity.
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 provides reliable detection of threat substances at low concentrations, reducing false alarms and container damage, with high sensitivity and mobility, enabling effective tracking and further inspection of positive containers.
Implementation Method 1
a sampling card with adsorbent/absorbent materials to trap vapors and particles
Implementation Method 2
a sampling card with adsorbent/absorbent materials to trap vapors and particles
Implementation Method 3
thermal desorption for detection
Data Source
Figure 1~2a
Figure 2b~4
Figure 3
AI summary
The invention is a method and system of screening the content of an enclosure, such as a cargo container, for the presence of one or more target substances, such as explosives or drugs, comprising drawing air from the enclosure and passing the drawn air across at least one sampling card having a coating configured to absorb/adsorb the one or more target substances and thereafter analyzing the sampling card to determine if the coating has absorbed/adsorbed one or more target substances. The system embodiment includes a vacuum source, a conduit coupled to the vacuum source and a sampling card holder disposed along the conduit. The sampling card holder removably holds at least one sampling card having a coating thereon configured to absorb/adsorb the one or more target substances, so that air drawn into the conduct from the enclosure passes across the at least one sampling card.