Portable Gas Sensor Mesh Network for Reliable Tracking
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Solution Overview
Problem
Existing portable gas sensing instruments face challenges in efficiently tracking operator status and detecting hazardous gas concentrations in industrial environments, particularly in areas with obstructions and dynamic network topologies, where reliable communication among devices is hindered by metal obstructions and distance from central hubs.
Innovation Solution
A mesh network system utilizing NFC tags for operator and location identification, enabling peer-to-peer communication among portable environmental sensing devices and area monitors without a central coordinator, allowing for self-forming, self-healing networks that adapt to changing environments and power-efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a central hub architecture is used for gas sensing devices, then data management and communication coordination are simplified, but reliability deteriorates due to single point of failure and metal obstructions blocking communication
Solution Approach 1:
The patent segments the centralized hub architecture into distributed peer-to-peer nodes. Each portable gas sensing device becomes an independent node capable of autonomous operation and direct communication with other nodes, eliminating the single point of failure inherent in centralized architectures. This segmentation allows the network to maintain functionality even when individual nodes or communication paths are blocked by metal obstructions.
Solution Approach 2:
The patent implements dynamic network topology where devices can dynamically join, leave, or change roles in the mesh network. Nodes can dynamically select alternative communication paths when direct paths are blocked, and the network automatically reconfigures to maintain connectivity. This dynamic adaptation resolves the contradiction by maintaining reliability through flexible routing while preserving the simplicity of automated network management.
2Reliability
If devices continuously transmit data in industrial environments, then real-time monitoring capability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic transmission cycles where devices transmit data at predetermined intervals rather than continuously. The mesh network protocol allows devices to enter low-power sleep modes between transmission cycles while maintaining network connectivity. This periodic action maintains real-time monitoring capability through regular updates while significantly reducing power consumption compared to continuous transmission.
Solution Approach 2:
The patent incorporates feedback mechanisms where devices adjust their transmission frequency and power levels based on network conditions, gas concentration levels, and battery status. When gas concentrations are stable and network conditions are good, transmission frequency is reduced to conserve power. When hazardous conditions are detected or network reliability is compromised, transmission frequency increases to ensure real-time monitoring. This feedback-based adaptation resolves the contradiction by dynamically balancing monitoring reliability with power consumption.
3Reliability
If mesh network protocol is implemented for peer-to-peer communication, then communication reliability in obstructed environments is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where each device autonomously performs network management tasks including route discovery, neighbor selection, and data forwarding without requiring centralized coordination. Devices automatically discover other nodes in the mesh network, establish communication paths, and dynamically adapt to network changes. This self-service approach resolves the contradiction by embedding the complexity within individual devices while maintaining simple peer-to-peer interaction models, thereby achieving reliable communication in obstructed environments without requiring complex external coordination.
4Ease of operation
If NFC tags are used for operator and location identification, then ease of operation is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent uses NFC tags as intermediary objects that store operator and location identification information externally. Instead of embedding complex identification systems within each gas sensing device, the devices simply read and write data to NFC tags that are attached to operators' personal items or placed at work locations. This intermediary approach resolves the contradiction by transferring the identification data storage function to separate, simple NFC tags, thereby maintaining ease of operation while minimizing the complexity and component count of the primary gas sensing devices.
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 reliable real-time tracking of operator status and gas concentration monitoring within a group of workers, maintaining communication and data sharing among devices in challenging industrial settings, improving safety and reducing power consumption through adaptive frequency and time diversity.
Implementation Method 1
receiving temporary assignment information at the safety device when an NFC radio of the safety device is brought in proximity to at least one of the plurality of NFC tags
Data Source
AI summary
A portable electrochemical or combustible lower explosive limit gas sensing apparatus includes a housing comprising at least one exterior surface and an interior space. At least one depression is formed in the at least one exterior surface and is adapted to accommodate, at least in part, components of an electrochemical gas sensor or a combustible LEL gas sensor. A processing unit is disposed in the interior space of the housing and is in electrical communication with the electrochemical gas sensor or the combustible LEL gas sensor.