VOC Capture Tube Sampling With Dynamic Flow Control
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Solution Overview
Problem
Existing technologies lack efficient methods for capturing volatile organic compounds (VOCs) for accurate analysis, particularly in applications such as health screening and disease detection.
Innovation Solution
A device comprising a microcontroller-controlled electric pump, sensors, and a gaseous sample collection system that allows for precise capture and analysis of VOCs, including a display for user interaction and a gaseous sample collection bag, enabling controlled flow rates and durations for efficient VOC collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual sample collection methods are used, then device complexity is reduced, but measurement precision and reliability of VOC capture deteriorate
Solution Approach 1:
The system performs self-service through automated pump control, sensor monitoring, and microcontroller coordination that eliminates manual operation while maintaining simple user interaction via the display interface
Solution Approach 2:
Manual mechanical sample collection is replaced by an electric pump system controlled by a microcontroller, with sensors providing automated monitoring and control, substituting mechanical manual operations with electromechanical automation
2Productivity
If high flow rates are used for sample collection, then productivity increases, but measurement precision deteriorates due to loss of volatile compounds
Solution Approach 1:
Sensors provide real-time feedback on the gaseous sample and VOC capture status, allowing the microcontroller to adjust pump operation dynamically to maintain optimal flow rates that balance collection speed with compound retention
Solution Approach 2:
The system transitions from static fixed flow rate operation to dynamic adjustable flow rates controlled by the microcontroller based on sensor feedback, allowing optimization of both collection speed and capture accuracy
3Quantity of substance
If long sampling duration is used, then quantity of captured compounds increases, but loss of time for overall process increases
Solution Approach 1:
The electric pump provides continuous controlled flow through the sampling system, maintaining steady-state capture conditions that maximize compound collection efficiency within reduced time frames compared to intermittent or manual sampling
Solution Approach 2:
The system optimizes the balance between capture quantity and time by dynamically adjusting flow rate parameters controlled by the microcontroller, achieving higher throughput without sacrificing total compound collection
4Ease of operation
If automated pump control is implemented, then ease of operation improves, but device complexity increases
Solution Approach 1:
The microcontroller serves multiple functions including pump control, sensor data acquisition, display management, and automated decision-making, consolidating complex control capabilities into a single integrated component that maintains simple user interaction
Solution Approach 2:
The automated system performs self-service by autonomously controlling pump operation based on sensor feedback without requiring manual intervention, making the complex control logic transparent to the user while maintaining ease of operation
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 capture and analysis of VOCs, facilitating accurate health screening and disease detection by ensuring high-quality sample collection and data integration.
Implementation Method 1
an electric pump connected to the one or more device inlets for drawing a gaseous sample, or a portion thereof, through the one or more device inlets and expelling the content of the gaseous sample, or a portion thereof, through the device outlet
Implementation Method 2
one or more compounds of the content in the gaseous sample collection bag, or a portion thereof, collected are captured onto the one or more gaseous sample capturing tubes
Data Source
Figure 1A~1C
Figure 1D
Figure 2A~2H
AI summary
Disclosed herein include systems, devices, and methods for capturing compounds, such as volatile organic compounds, in gaseous samples onto capturing tubes, such as thermal desorption tubes, for subsequent analysis, such as disease diagnosis (e.g., cancer diagnosis).