Portable Micro-Preconcentrator Manifold for Low-Concentration Vapor Sampling
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Solution Overview
Problem
Current chemical-analysis systems face challenges in effectively detecting vapor-phase chemical compounds due to their diffuse concentrations, particularly in portable settings where smaller IMS and GC systems are deployed for applications like chemical weapon detection and human-breath analysis, requiring efficient preconcentration methods.
Innovation Solution
A preconcentrator system designed for air samples, incorporating multiple preconcentrators with a delivery structure that routes sample airflow concurrently or individually, integrated into unmanned aerial systems, and featuring sorbent materials and heaters for efficient compound trapping and release, along with GPS data integration and microfabrication techniques for miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a preconcentrator is installed to enhance detection performance by trapping and concentrating analytes, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The micro-preconcentrator is integrated within the portable IMS system, with the preconcentrator housing containing sorbent material that traps analytes from air samples. The concentrated analytes are then thermally desorbed and introduced into the IMS detector, nesting the preconcentration function within the detection system to enhance measurement precision without requiring a completely separate system
Solution Approach 2:
The system divides the air sampling and analysis function into distinct segments: the micro-preconcentrator segment that traps and concentrates analytes using sorbent material, and the IMS segment that detects the concentrated analytes. This segmentation allows each component to be optimized for its specific function while working together as an integrated portable system
2Ease of operation
If portable IMS and GC systems are deployed for field use, then ease of operation is improved, but measurement precision deteriorates due to diffuse concentrations of vapor-phase compounds
Solution Approach 1:
The micro-preconcentrator performs preliminary action by trapping vapor-phase compounds from air samples as they pass through the sorbent material before the samples reach the IMS detector. This preliminary concentration step ensures that even diffuse concentrations of analytes are sufficiently concentrated for accurate detection, enabling portable field deployment without sacrificing measurement precision
Solution Approach 2:
The sorbent material acts as an intermediary between the air sample and the IMS detector. It temporarily holds the vapor-phase compounds, concentrating them from diffuse atmospheric concentrations into a more concentrated form that can be efficiently introduced into the IMS system for accurate detection, thereby bridging the gap between portable sampling and precise measurement
3Productivity
If multiple preconcentrators are used to improve sampling efficiency, then productivity is improved, but device complexity increases
Solution Approach 1:
The system uses multiple discrete micro-preconcentrators (first, second, and third preconcentrators) that can operate independently or in combination. Each preconcentrator is a separate unit with its own sorbent material housing, allowing them to process different air samples simultaneously or to provide redundant sampling capabilities, thereby improving productivity through parallel operation while maintaining manageable system complexity through modular design
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
Enhances detection performance by concentrating analytes, enabling real-time chemical analysis in portable settings, improving sampling efficiency and selectivity, and facilitating closed-loop control of environmental parameters in shipping containers to prevent spoilage and optimize storage conditions.
Implementation Method 1
trapping and concentrating analytes
Implementation Method 2
one or more heaters to trigger a release of absorbed compounds from the sorbent material
Data Source
AI summary
The disclosed embodiments relate to the design of a preconcentrator system for preconcentrating air samples. This preconcentrator system includes a plurality of preconcentrators that preconcentrate the air samples prior to chemical analysis, and a delivery structure comprising a manifold that selectively routes a sample airflow to the plurality of concentrators so that the plurality of preconcentrators receive a sample airflow concurrently or individually.