Aerosol Sampling Module with Inertial Impaction and Vaporization
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Solution Overview
Problem
Current sampling technologies are inadequate for simultaneously collecting, concentrating, and vaporizing both dry and liquid aerosol particles and vapors for chemical analysis, particularly failing to efficiently detect solids-based toxic compounds and requiring separate systems for particulate and vapor analysis.
Innovation Solution
A sampling system with a collection chamber, pump, and heater that divides fluid flow to concentrate particles on a porous collection surface, vaporizes them, and directs the vapors into a minor flow stream for chemical analysis, using a combination of inertial and virtual impaction techniques with sorbent-coated surfaces for high-efficiency chemical transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inertial impactor systems are used to collect particles on a surface, then particle concentration is improved, but the system cannot simultaneously vaporize and analyze both aerosol particles and vapors
Solution Approach 1:
The impactor system is designed to perform multiple functions: collecting aerosol particles on the impactor surface, vaporizing them through heating, and allowing the resulting vapors to be carried by a secondary flow to the analyzer. This multi-functional design enables simultaneous analysis of both aerosol and vapor phases without requiring separate systems.
Solution Approach 2:
The patent combines the particle collection function and vaporization function into a single integrated system. The impactor surface serves dual purposes: as a collection surface for particles and as a vaporization surface when heated. The primary and secondary flows are merged at the analyzer inlet, allowing both collected particles and vaporized analytes to be analyzed together.
2Measurement precision
If virtual impactors concentrate particles into a lower flow stream, then detection sensitivity is improved, but energy consumption increases due to additional heating requirements
Solution Approach 1:
The system utilizes phase transition (vaporization) of collected particles to enable detection. By heating the impactor surface, solid or liquid particles are converted to vapor phase, which can then be carried by the secondary flow to the analyzer. This phase transition approach improves detection sensitivity while managing energy consumption through efficient heat transfer to the collected sample.
3Adaptability or versatility
If impingers collect particles into liquid, then chemical analysis capability is improved, but the system complexity and device size increase
Solution Approach 1:
The patent extracts the liquid collection function from the system and replaces it with direct vaporization of collected particles. Instead of using impingers to collect particles in liquid for subsequent analysis, the system directly vaporizes particles on the impactor surface and carries the vapors to the analyzer. This extraction of the liquid collection step simplifies the system while maintaining chemical analysis capability.
4Quantity of substance
If filtration is used to pull particles from flow, then particle separation is improved, but the system cannot provide simultaneous concentration and vaporization
Solution Approach 1:
The system performs preliminary concentration of particles on the impactor surface before vaporization. The primary flow carries particles to the impactor where they are concentrated on the surface. This preliminary concentration action enables subsequent efficient vaporization and analysis, achieving both separation and simultaneous concentration-vaporization functionality.
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 the rapid vaporization and concentration of aerosol particles and vapors, achieving a high preconcentration factor and facilitating chemical detection using various analytical technologies like Mass Spectrometry, while minimizing energy consumption and preventing clogging.
Implementation Method 1
particles in the flow of fluid into said inlet impinge on said collection surface
Implementation Method 2
a heater which vaporizes particles that collect on said collection surface
Implementation Method 3
The module has a porous and/or sorbent coated collection surface that enables the simultaneous collection and preconcentration of particles and vapors
Data Source
AI summary
A sampling system is disclosed which comprises a collection chamber equipped with an inlet and first and second outlets; a pump which creates a flow of fluid into said inlet from the ambient environment, wherein said collection chamber divides the flow of fluid into a first major flow of fluid along which flows along a first flow path between said inlet and said first outlet, and a second minor flow of fluid which flows along a second flow path between said inlet and said second outlet; a collection surface disposed within said collection chamber and within the second flow path such that particles in the flow of fluid into said inlet impinge on said collection surface; a heater which vaporizes particles that collect on said collection surface; and an analyzer which analyzes the composition of the fluidic flow through said second outlet.