Intrinsically Safe Tracking Tags in Wired-Mesh Networks
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Solution Overview
Problem
Existing tracking systems in hazardous environments, such as underground mines and refineries, face challenges with precision due to poor radio signal propagation and the risk of ignition, and GPS signals are unreliable in enclosed or explosive areas, limiting the accuracy and safety of personnel and equipment tracking.
Innovation Solution
A system utilizing intrinsically safe tracking tags and antennas in a wired-mesh, redundant connective infrastructure topology, which allows for precise location tracking and continued operation in explosive environments by ensuring the safety of the tracking system components and providing redundant power and communication paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If GPS-based tracking systems are used in hazardous environments, then tracking coverage area is expanded, but measurement precision deteriorates due to poor radio signal propagation in enclosed structures
Solution Approach 1:
The tracking system is segmented into multiple independent components: tracking tags on personnel/equipment, multiple reader antennas distributed throughout the environment, and a central processing system. This segmentation allows the system to overcome signal propagation limitations by having multiple reception points, enabling precise location determination even when direct GPS signals are blocked.
2Productivity
If traditional tracking tags are used in explosive environments, then tracking functionality is provided, but safety deteriorates due to ignition risk from non-intrinsically-safe components
Solution Approach 1:
The electrical parameters of the tracking tags and reader system are changed to meet intrinsically safe standards. This involves limiting voltage, current, and energy levels to predetermined safe values that cannot cause ignition in explosive atmospheres. The system maintains full tracking functionality while operating within these constrained electrical parameters.
3Reliability
If tracking system components are made intrinsically safe, then safety is improved in explosive environments, but device complexity increases due to redundant safety mechanisms
Solution Approach 1:
The intrinsically safe design uses inherent system characteristics to ensure safety without requiring complex external monitoring or control mechanisms. The electrical parameters are designed to be self-limiting, and the wired-mesh topology provides inherent redundancy that automatically maintains system operation without complex failover logic.
4Reliability
If wired-mesh topology is used for reader system, then reliability is improved through redundant paths, but device complexity increases compared to simple wireless-mesh systems
Solution Approach 1:
A wired-mesh infrastructure acts as an intermediary between the intrinsically safe reader antennas and the central processing system. This wired backbone provides reliable, redundant communication paths while keeping the potentially hazardous wireless portion limited to intrinsically safe tags and antennas. The wired infrastructure handles the complexity of redundancy management.
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 enables accurate and reliable tracking of personnel and equipment with high granularity, ensuring safety by maintaining operation in hazardous environments and preventing ignition risks, even in areas where GPS signals are unreliable.
Implementation Method 1
The tracking tag is intrinsically safe and periodically transmits a radio signal containing a unique tracking tag identification code identifying the tracking tag
Implementation Method 2
Each intrinsically safe antenna is configured to receive the radio signal from the tracking tag and transmit a data signal to the hub cable driver over the communication cables
Data Source
AI summary
A system for tracking personnel and equipment in hazardous environments in pre or post-accident situations includes an intrinsically safe tracking tag and an intrinsically safe reader system. The intrinsically safe tracking tag transmits identification and status information to the intrinsically safe reader system, which includes a plurality of intrinsically safe antennas and a hub cable driver. In one embodiment, antennas are located at known positions in the hazardous environment and connected via a redundant, wired-mesh topology. The wired-mesh topology also allows more flexible antenna placement than line-of-sight wireless-mesh systems. The hub cable driver provides intrinsically safe power to and communication with the antennas using communication cables, receives data signals from the antennas, and transmits the data signals to a server. The server stores the data signals in a storage device and is connected to a workstation. The workstation retrieves the stored data to track persons or equipment.