Sensor-Controlled Air Sampling to Prevent Trap Saturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing portable air samplers are inefficient and lack control over the sampling process, failing to detect trap saturation, environmental parameters, and provide limited data transfer capabilities, leading to suboptimal VOC collection and analysis.
Innovation Solution
A portable air sampler equipped with sensors for temperature, pressure, and humidity, along with a controller to regulate pump operation based on ambient conditions, ensuring efficient trap use and data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump runs continuously to collect VOC, then the trap may become saturated, but stopping the pump loses sampling opportunity
Solution Approach 1:
The system uses sensors to continuously monitor VOC levels, temperature, and humidity in the air stream, feeding this information back to the controller. The controller adjusts pump operation based on this feedback, stopping the pump when the trap is nearly saturated or environmental conditions are unfavorable, and restarting it when conditions improve. This feedback mechanism resolves the contradiction by preventing trap saturation while maximizing sampling opportunities.
Solution Approach 2:
The pump operation is made dynamic rather than static, transitioning between on and off states based on real-time sensor readings. The system dynamically adjusts sampling based on current VOC concentrations, temperature, and humidity levels, allowing the pump to run only when conditions are favorable for collection while avoiding saturation.
2Productivity
If the pump runs during unfavorable environmental conditions, then sampling continues, but data quality deteriorates
Solution Approach 1:
Temperature and humidity sensors provide continuous feedback on environmental conditions to the controller. The controller uses this feedback to determine whether current conditions are favorable for quality sampling, stopping the pump when temperature or humidity levels indicate poor data quality and resuming operation when conditions improve.
Solution Approach 2:
The system monitors changes in environmental parameters (temperature, humidity) and adjusts pump operation accordingly. When parameters indicate unfavorable conditions for VOC collection, the pump stops; when parameters improve, sampling resumes. This parameter-based control ensures high data quality while maintaining sampling productivity.
3Productivity
If the pump runs when VOC levels are low, then sampling continues, but meaningful data collection is wasted
Solution Approach 1:
VOC sensors provide real-time feedback on constituent levels in the air stream. The controller uses this feedback to determine when to start and stop pumping, activating the pump only when VOC levels are sufficient to warrant collection and stopping it when levels drop below meaningful thresholds, thus avoiding waste of sampling capacity on insignificant measurements.
Solution Approach 2:
The system applies partial action by activating the pump only partially - specifically only when VOC concentrations are above meaningful thresholds. Rather than continuous operation, the pump operates intermittently based on actual VOC presence, avoiding excessive sampling of insignificant VOC levels while maintaining readiness to sample when meaningful concentrations occur.
4Extent of automation
If sensors continuously monitor air conditions, then real-time control is achieved, but device complexity increases
Solution Approach 1:
The sensor system is designed with multi-functionality, where a single sensor array monitors multiple parameters (VOC levels, temperature, humidity) simultaneously. The controller integrates multiple functions including pump control, data logging, saturation detection, and environmental monitoring into one unified system, reducing overall device complexity while maintaining high automation capability.
Solution Approach 2:
The patent combines multiple sensing functions and control functions into an integrated system. The controller merges pump control logic, environmental monitoring, VOC detection, and data management into a single coordinated unit, reducing the number of separate components and simplifying the overall device architecture while enabling sophisticated unattended 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
The system effectively controls the sampling process to avoid trap saturation and environmental unfavorable conditions, enhancing data quality and enabling remote monitoring.
Implementation Method 1
a trap, for capturing a constituent of the air or gas
Implementation Method 2
A pump causes air to be drawn from the ambient atmosphere or a selected sampling domain and through the pump
Data Source
AI summary
Apparatus for sampling air or another gas comprises a trap which captures a first constituent of air or gas that is passed through the trap, for example Volatile Organic Compounds (VOC), or the amount of suspended particulate. A first sensor measures, in the air or gas the flows into the trap the amount of first constituent, and or the amount of a second constituent, and or a property of the air or gas, such as temperature or humidity. A second sensor measures, in the air or gas that has flowed through the trap, the amount of first constituent, and or the amount of a third constituent, and or of the air or gas properties. The time period when the pump runs, the pump speed or flow rate, and opening and closing of a valve at the trap inflow end, are determined by comparing first sensor and second sensor signals or by comparing constituent amounts or properties to a predetermined threshold.