Multi-Frequency Wearable RFID for Hazard Proximity Detection
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Solution Overview
Problem
Existing workplace accident prevention systems face challenges in accurately locating operators near hazardous areas with low power consumption, high reactivity, and integration into personal protective equipment, particularly due to the need for multiple directive antennas and high battery consumption in UWB technology.
Innovation Solution
A wearable RFID system using multiple frequency RFID devices with a TAG integrated into garments and accessories, combining low consumption, accurate distance detection, and high reactivity, utilizing a loop antenna and a control unit to calculate distance based on RSSI, and employing multiple transmission antennas for spatial referencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID devices operate at a single frequency (2.4 GHz), then the device complexity is reduced, but the reliability of accident prevention is insufficient due to signal interference and penetration issues
Solution Approach 1:
The RFID system is segmented into multiple frequency channels (2.4 GHz and 5.8 GHz) to divide the communication task across different frequencies, reducing interference and improving reliability in hazardous environments
Solution Approach 2:
The RFID devices are designed with multi-functionality to operate at multiple frequency bands, allowing a single device to adapt to different environmental conditions and maintain reliable communication for accident prevention
2Adaptability or versatility
If the hazardous area boundary is fixed and static, then the device complexity is reduced, but the adaptability to dynamic operator movement and changing work conditions is limited
Solution Approach 1:
The hazardous area boundary is transformed from a static geometric definition to a dynamic virtual boundary that automatically adjusts based on operator position, RFID tag locations, and real-time detection data, enabling adaptability to changing work conditions
Solution Approach 2:
The system implements continuous feedback loops where operator positions are tracked, boundaries are dynamically recalculated, and alerts are triggered based on real-time proximity detection, allowing the boundary to adapt to dynamic movement patterns
3Loss of information
If only a single alert level is used, then the ease of operation is improved, but the loss of information about gradient proximity and risk level occurs
Solution Approach 1:
The alert system applies local quality by providing different alert levels (first, second, third alerts) corresponding to different proximity zones and risk gradients, allowing operators to understand their specific risk level rather than receiving a generic warning
Solution Approach 2:
The system uses visual color changes in alerts to communicate different proximity levels and risk gradients intuitively, making the graduated alert system easy to interpret while preserving detailed proximity information
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, timely, and energy-efficient detection of operator proximity to hazards, ensuring integration into personal protective gear and reducing complexity and cost.
Implementation Method 1
The system uses the transmission of an activation signal by coded transmitters placed at the areas of interest or hazardous areas. The transmitted activation signal is received by RFID receiver-transmitter devices, TAGs, worn by the operators present in the area of interest
Data Source
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AI summary
A system for preventing accidents in industrial areas that house operators moving and working within said area. The system detects the proximity of an operator to an hazardous area and the distance between the operator and the hazardous area. The system uses the transmission of an activation signal by coded transmitters placed at the areas of interest or hazardous areas. The transmitted activation signal is received by RFID receiver-transmitter devices, TAGs, worn by the operators present in the area of interest, which respond on a radio channel that is different with respect to that used for transmitting the activation signal.