Soil Gas Probe Recirculation Loop for High Resolution Sampling
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Solution Overview
Problem
Current soil gas measurement technologies are invasive, disruptive, and costly, with low spatial resolution, making them unsuitable for accurate and efficient monitoring of soil processes such as microbial activity and contamination status.
Innovation Solution
A compact soil gas probe system with a recirculation loop, micropump, and flow-through valve, made from cost-effective materials like stainless steel and glass, allowing for high spatial resolution measurements and online automation, reducing sampling footprint and artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional soil gas probes are used, then gas sampling capability is achieved, but soil disruption increases and spatial resolution decreases
Solution Approach 1:
The probe is divided into distinct functional segments: a protective outer casing, an internal sampling chamber, and a membrane interface. This segmentation allows each component to be optimized independently - the outer casing protects against soil disruption while the internal chamber maintains precise gas sampling capability
Solution Approach 2:
A membrane interface is introduced as an intermediary between the soil environment and the sampling chamber. This membrane allows gas molecules to pass through while maintaining a sealed sampling environment, enabling high spatial resolution measurements without direct probe intrusion into the soil matrix
2Measurement precision
If traditional soil gas probes are used, then gas sampling is possible, but material cost increases
Solution Approach 1:
The probe utilizes porous membrane materials that provide selective gas permeability at low cost. These porous membranes enable accurate gas composition measurements while being manufactured from economical materials suitable for field deployment
Solution Approach 2:
The design optimizes the internal volume parameter (less than 5 cm³) to achieve measurement accuracy while minimizing material requirements. By carefully controlling the volume parameter, the probe maintains measurement precision with reduced material costs
3Measurement precision
If probe size is reduced for high spatial resolution, then measurement precision improves, but device complexity increases
Solution Approach 1:
Multiple functions are merged into the compact probe structure: the outer casing provides both mechanical protection and structural support, while the membrane interface simultaneously enables gas exchange and seals the sampling chamber. This functional merging achieves high spatial resolution without proportionally increasing complexity
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 provides accurate, representative soil gas measurements with enhanced spatial and temporal resolution, enabling efficient monitoring of soil health, contamination, and bioremediation processes without disrupting the soil, and is durable enough for field use.
Implementation Method 1
a micropump
Implementation Method 2
a flowthrough valve
Implementation Method 3
a volume expansion tube
Implementation Method 4
a recirculation loop that comprises a soil gas sampling probe according to the invention, a volume expansion tube, a micropump, and a flowthrough valve
Data Source
AI summary
The disclosure includes a soil gas sampling probe for collection samples of soil gas, a soil gas sampling system that includes at least one recirculation loop that includes a soil gas sampling probe as a component, and methods of using the soil gas sampling probe and the soil gas sampling system.