Handheld Trace Detector with Thermal Desorption
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Solution Overview
Problem
Current detection systems for explosives and chemical threats face challenges in efficiently collecting and delivering trace samples, particularly in adapting to various scenarios, minimizing false positives, and integrating sampling and detection in a handheld unit.
Innovation Solution
A handheld detector system with a sampling head, air-jet nozzles, and a concentrator that captures both particles and vapors, using a fluid system with a pump for negative and positive pressure flows to collect and deliver samples to a single detector, along with temperature-programmed desorption for improved analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a liquid film or charged droplet spray is used to collect vapor and particles, then collection efficiency is improved, but the sample is concentrated in liquid form which is not suitable for vapor-phase trace detectors
Solution Approach 1:
The patent changes the physical state parameter of the collected sample from liquid to solid by using a solid adsorbent material (such as porous polymer beads) instead of liquid film or charged droplets. This parameter change enables the collected sample to be compatible with vapor-phase trace detectors while maintaining high collection efficiency.
Solution Approach 2:
The patent replaces the liquid-based collection mechanism (liquid film or charged droplet spray) with a solid-phase adsorption mechanism. This substitution allows the collected sample to be directly vaporized and introduced into the detector without requiring liquid handling steps, thus improving compatibility with vapor-phase detectors.
2Reliability
If separate detectors are used for vapor and particle analysis, then detection capability is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the vapor and particle detection capabilities into a single integrated detector by collecting both phases on a solid adsorbent and then thermally desorbing them for analysis in one detector. This combining approach maintains comprehensive detection capability while reducing device complexity and size compared to using separate detectors.
Solution Approach 2:
The patent creates a universal sampling and detection system where a single detector can analyze both vapor and particle samples. The solid adsorbent collector and thermal desorption interface enable the detector to handle multiple sample types, achieving multi-functionality without requiring separate detection systems.
3Quantity of substance
If manual swiping methods are used to collect residue from surfaces, then collection effectiveness is improved, but operation time and human error increase
Solution Approach 1:
The patent replaces manual mechanical swiping with an automated airflow-based collection system. Air is drawn through the sampling area and carries residue particles directly to the collector, eliminating manual operation and significantly reducing collection time while maintaining or improving collection effectiveness.
Solution Approach 2:
The system enables self-service collection where the airflow automatically performs the collection function without requiring manual swiping operations. The system draws in and collects samples autonomously, reducing human involvement and operation time.
4Ease of operation
If a handheld integrated system is created, then portability and operational flexibility are improved, but power consumption and thermal management become challenging
Solution Approach 1:
The patent uses periodic thermal desorption cycles where the collector is heated only during the analysis phase rather than continuously. This periodic heating reduces overall power consumption while maintaining the ability to rapidly analyze samples in a portable handheld system.
Solution Approach 2:
The system utilizes the phase transition from solid adsorbed state to vapor phase during thermal desorption. This efficient phase transition mechanism allows for rapid sample transfer to the detector with relatively low and brief heating energy input, improving the power efficiency of the handheld system.
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
Enables efficient collection and analysis of both particles and vapors in a single handheld unit, reducing false positives and increasing detection accuracy through separate desorption of trace molecules, with a reusable cartridge and battery-powered operation.
Implementation Method 1
a pump arranged: to provide negative pressure fluid flow to pull the sample through the intake port and concentrator
Implementation Method 2
to provide continuous positive pressure fluid flow to pressurize the air-jet nozzles
Implementation Method 3
a concentrator that captures the trace sample
Implementation Method 4
deliver the material to a trace detector in a step that involves vaporization
Implementation Method 5
a single detector coupled to said concentrator
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3
AI summary
A hand held detector system that has a housing with a passage that can receive a sample, and a concentrator that captures the sample. The hand held system further includes a single detector coupled to the concentrator and a fluid system that provides fluid communication between the housing passage and the concentrator, and between the concentrator and the detector. The system is powered by a battery. The system may include a controller that heats the concentrator with a temperature profile that causes a first trace molecule to desorb at a time different from the desorption of a second trace molecule. The system is components are powered by a battery.