Multi-Canister Air Sampling Apparatus for UAV Turbulence Mitigation
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Solution Overview
Problem
Current methods for collecting atmospheric VOCs are limited by long sample collection times, small sample sizes, poor spatial resolution, and susceptibility to rotor washout and turbulence, making it difficult to obtain high-quality VOC flux data for air quality forecasting and source identification.
Innovation Solution
An air sample collection apparatus comprising multiple miniaturized canisters, a multi-position valve, and a computing device that operates a pump to provide pressurized air, allowing for rapid and simultaneous sampling at multiple locations while minimizing the effects of rotor washout, with a computing device controlling the valve to manage sample collection and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single two-liter evacuated stainless steel canister is used on a helicopter, then gas samples can be collected, but the sample collection is limited by turbulence due to helicopter rotor wash and provides poor spatial sampling
Solution Approach 1:
The patent divides the single large canister into multiple smaller canisters (e.g., six 500mL canisters instead of one 2L canister). This segmentation allows the sampling system to collect multiple discrete spatial samples simultaneously, improving spatial resolution while maintaining adequate sample sizes for analysis. Each canister can be positioned at different locations or altitudes to capture spatial variations in VOC concentrations.
Solution Approach 2:
The patent transitions from collecting a single bulk sample to collecting multiple discrete spatial samples, adding the dimension of spatial distribution to the sampling approach. By using multiple canisters that can be distributed across different locations and altitudes, the system captures three-dimensional spatial variability in atmospheric VOCs, enabling better characterization of pollution sources and transport pathways.
2Quantity of substance
If a VOC-absorbent cartridge system is used, then trace gases can be absorbed, but desorption leads to measurement artifacts, high blanks, and high detection limits
Solution Approach 1:
The patent extracts the VOC absorption function from the cartridge system and implements it through direct physical sampling into preserved canisters. By using canisters with preservatives that prevent VOC degradation without requiring desorption, the system eliminates the measurement artifacts, high blanks, and detection limits associated with cartridge desorption while maintaining the ability to capture trace VOC gases.
Solution Approach 2:
The patent employs disposable preservative canisters that are sealed and transported directly to the laboratory for analysis, eliminating the need for reusable absorbent cartridges that require desorption. This disposable approach with proper preservatives prevents contamination and degradation throughout the sampling and transport process, improving measurement reliability.
3Measurement precision
If the AirCore Sampling system is used, then long-lived greenhouse gases can be separated and identified, but the small inner diameter limits usefulness for detecting a wide range of VOCs and provides very small gas sample sizes
Solution Approach 1:
The patent uses multiple larger canisters instead of a single small AirCore tube. This segmentation approach allows each canister to collect adequate volumes of VOC samples while the multi-canister system provides the spatial resolution needed to characterize VOC distributions. The larger canister volume enables detection of a wider range of VOC species with sufficient signal intensity.
4Productivity
If prior sampling methods are used with UAS, then VOC data can be obtained, but the equipment is too heavy or bulky to fly on low cost UASs and is ill equipped to deal with rotor washout eddies and turbulence
Solution Approach 1:
The patent segments the sampling system into multiple small, lightweight canisters rather than using a single large heavy canister or complex cartridge system. This segmentation dramatically reduces the total weight and bulk of the sampling equipment, making it suitable for deployment on low-cost UAS while maintaining the capability to collect adequate VOC samples for analysis.
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 faster, higher-resolution VOC flux data collection with increased sample sizes, improved spatial sampling, and reduced artifacts, facilitating better identification of pollution sources and atmospheric modeling.
Implementation Method 1
a pump operable to provide pressurized sample air to the inlet region of the multi-position valve
Data Source
AI summary
An air sample collection apparatus and methods for operating the air sample collection apparatus are provided. The air sample apparatus comprises a plurality of air canisters comprising at least a first canister and a second canister, a multi-position valve comprising an outlet, and an inlet region, which are fluidly connected to a plurality of ports. Each respective port is fluidly connected to a canister of the plurality of air canisters, a pump operable to provide pressurized sample air to the inlet region of the multi-position valve, and a computing device operable to open and close each respective port fluidly coupled to each canister of the plurality of canisters.