Proximity Detection System Using Magnetic Field RFID Tags
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Solution Overview
Problem
Existing proximity detection systems face issues with directional limitations, susceptibility to environmental factors, and fluctuations in detection distance due to the use of ultrasonic waves, infrared rays, and radio waves, and lack the ability to adjust alarm levels and settings conveniently, especially in dynamic work site environments.
Innovation Solution
A proximity detection system utilizing a distance detection control unit with an inductive magnetic field emitting section and RFID tags equipped with magnetic field sensors, allowing for adjustable sensitivity settings and multiple alarm levels based on detected magnetic field strengths, enabling precise distance measurement and alarm activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasonic wave or infrared ray type distance detecting devices are used, then detection can be performed in a certain direction, but detection is limited to specific directions due to directivity
Solution Approach 1:
The patent combines radio wave transmitting and receiving functions with magnetic field detecting functions in a single RFID tag system. The radio wave components provide omnidirectional detection capability while the magnetic field sensor adds another detection dimension, merging multiple detection methods to achieve both directional precision and comprehensive coverage.
Solution Approach 2:
The RFID tag serves multiple functions: it acts as both a radio wave transmitting/receiving device for distance measurement and a magnetic field detecting device for proximity detection. This multi-functionality allows the system to adapt to different detection scenarios and environments without requiring separate specialized devices.
2Adaptability or versatility
If radio wave type distance detecting devices are used, then 360-degree distance detection is possible, but detection distance fluctuates due to radio wave reflection
Solution Approach 1:
The patent introduces magnetic field detection as an intermediary measurement method alongside radio wave detection. The magnetic field sensor detects the strength of the magnetic field generated by the RFID tag, providing a complementary measurement that is less susceptible to reflection effects. This intermediary detection path helps compensate for the inaccuracies caused by radio wave reflection.
Solution Approach 2:
The patent replaces pure radio wave-based distance measurement with a hybrid system that incorporates magnetic field detection. The magnetic field sensing mechanism provides an alternative physical basis for distance measurement that is less affected by environmental factors like reflection, substitution the radio wave mechanism with a magnetic field-based approach.
3Reliability
If radio wave reflection is present, then communication holes are formed within short distance, but detection reliability is reduced
Solution Approach 1:
The magnetic field detection function acts as an intermediary that provides reliable detection even when radio wave communication is disrupted by reflection. The magnetic field sensor can detect the RFID tag's presence and distance information through the magnetic field strength, serving as a backup detection path that maintains reliability when radio waves are blocked or reflected.
4Ease of operation
If alarm levels and detection distances are fixed, then system operation is simple, but adaptability to varying work site environments is insufficient
Solution Approach 1:
The patent implements dynamic adjustment of alarm levels and detection distances based on the detected magnetic field strength and communication conditions. The system automatically adapts its parameters according to the work site environment, transitioning from fixed to dynamic operation to maintain both simplicity and adaptability.
Solution Approach 2:
The system uses feedback from the magnetic field sensor and radio wave communication to automatically adjust alarm levels and detection parameters. The detected magnetic field strength and communication quality information are fed back to the control unit, which then adjusts the alarm settings accordingly, enabling automatic adaptation to varying environments.
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 effectively changes alarm levels and sets alarm-generating distances, accurately detecting the closest worker to a self-propelled apparatus, enhancing safety by minimizing false alarms and improving detection accuracy across varying environments.
Implementation Method 1
a distance detection control unit 100 and at least one magnetic field detecting function-equipped RFID tag 110, wherein: the distance detection control unit 100 comprises an inductive magnetic field emitting section 101, a radio wave receiving section 103, and a first control section 102
Implementation Method 2
the magnetic field sensor section 111 is operable to detect an inductive magnetic field emitted from the inductive magnetic field emitting section 101
Implementation Method 3
the radio wave receiving section 103 is operable to receive a radio wave signal 121 transmitted from the RFID tag 110
Data Source
AI summary
Provided is a proximity detection system which is capable of changing a level of alarm depending on a distance between a worker and an apparatus, and setting an alarm-generating distance in an apparatus-side unit. The proximity detection system comprises a magnetic field detecting function-equipped RFID tag attachable to a worker, and a distance detection control unit installable in a self-propelled apparatus. The magnetic field detecting function-equipped RFID tag is configured to be selectively set between a plurality of levels of magnetic field detecting sensitivity, and comprises means to intermittently transmit setup magnetic field detecting sensitivity data and magnetic field detection data. The distance detection control unit is configured to output different levels of alarm according to the data received from the RFID tag.