Off-Grid Methane Sensor Network with Calibration
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Solution Overview
Problem
Current methane detection systems are costly, require skilled operators, and are not suitable for continuous, unattended monitoring in remote locations, often producing false positives due to interference from other gases and environmental factors, making them impractical for large-scale, long-term use in oil and gas production and agricultural settings.
Innovation Solution
A system comprising low-cost metal-oxide semiconductor sensors, temperature, and humidity sensors, coupled with a telemetry module and renewable power source, allowing for autonomous, continuous monitoring and data transmission to a cloud-based server, with calibration to compensate for interference and calculate accurate methane concentrations and leak rates using wind data in an atmospheric plume dispersion model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If research-grade methane detectors are used, then measurement precision and selectivity are improved, but device cost and power consumption increase significantly
Solution Approach 1:
The patent replaces expensive research-grade detectors with inexpensive commercial-grade methane detectors that cost hundreds to thousands of dollars compared to tens of thousands for research-grade instruments. These lower-cost detectors are deployed in large numbers across multiple locations, accepting that individual units may have shorter operational lifetimes or require more frequent calibration, but the overall system achieves better coverage and cost-effectiveness
Solution Approach 2:
The patent creates a network of multiple detector copies distributed across the monitoring area rather than using a single high-precision instrument. Each detector in the network is a simplified version with lower individual precision, but the collective network achieves comprehensive monitoring coverage and through data aggregation and analysis, compensates for individual unit limitations
2Measurement precision
If research-grade methane detectors are used, then measurement precision is improved, but power consumption increases making continuous operation impractical
Solution Approach 1:
The patent accepts lower power consumption from commercial-grade detectors even though it means sacrificing some measurement precision. The energy-efficient detectors can operate continuously on battery power or solar energy, enabling unattended long-term deployment in remote locations without requiring the high power consumption of research-grade instruments
Solution Approach 2:
The system uses periodic sampling of methane concentrations rather than continuous high-rate measurement. Detectors take measurements at intervals and transmit data periodically, reducing average power consumption while still capturing temporal variations in methane emissions. This allows battery-powered or solar-powered operation in remote locations
3Device complexity
If commercial-grade methane detectors are used, then device cost is reduced, but measurement precision and selectivity worsen leading to false positives
Solution Approach 1:
The patent combines multiple detector readings from a network of commercial-grade detectors to achieve reliable methane leak detection. By aggregating data from multiple low-cost units and using pattern recognition algorithms, the system distinguishes true methane leaks from false positives caused by detector cross-sensitivity to other gases, achieving both low cost and acceptable precision
Solution Approach 2:
The system uses feedback mechanisms where detector readings are continuously monitored and compared against threshold values and historical data. When a detector signals a potential leak, the system cross-validates with readings from neighboring detectors and uses feedback loops to adjust for environmental conditions and detector drift, reducing false positives while maintaining low-cost operation
4Stability of the object's composition
If fixed installation detectors requiring AC power are used, then measurement stability is improved, but adaptability to remote locations is reduced
Solution Approach 1:
The patent transitions from static AC-powered fixed installations to dynamic battery-powered or solar-powered portable detectors. These detectors can be dynamically deployed to remote locations without electrical infrastructure, moved between sites, and adapted to changing monitoring needs while maintaining sufficient operational stability through careful power management and environmental protection
Solution Approach 2:
The system uses self-sufficient detectors with onboard batteries or solar panels that do not require external AC power infrastructure. These autonomous detectors can be deployed in remote locations independently, performing self-monitoring and self-reporting of methane concentrations without requiring connection to electrical grids or frequent manual intervention for power reconnection
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 cost-effective, continuous, and accurate methane detection and quantification, reducing false positives and enabling real-time monitoring and source identification, thus facilitating effective emissions reduction and management in large-scale settings.
Implementation Method 1
low-cost metal-oxide semiconductor sensors
Implementation Method 2
metal-oxide semiconductor sensors
Data Source
AI summary
Disclosed herein are systems and methods for detecting methane and other gases in the atmosphere. The ability to remotely deploy and autonomously detect, quantify, and report emission rates of methane and other gases to the atmosphere is an important step in the evolution of emissions calculation and reduction. This will assist energy producers, regulators, researchers, and other interested parties to better understand the emission profiles of various locations.