Protection Barrier RFID Distance Sensing for Noise-Resistant Safety
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Solution Overview
Problem
Existing electronic safety devices for protection barriers face issues with interference-induced reading errors, complex circuitry, poor noise immunity, high costs, and limited adaptability to various RFID transponders, which affect their reliability and versatility.
Innovation Solution
An electronic safety device that processes radio-frequency signals to generate a control signal with parameters changing based on distance, using a master and slave electronic circuit to accurately determine distance and synchronize identification signal processing, allowing for versatile use with different RFID transponders and improved noise resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplicate control circuits are used to check identification codes, then safety degree is improved, but circuit complexity increases
Solution Approach 1:
The patent merges the identification code checking function into a single integrated control circuit that processes both identification verification and distance measurement. This consolidation maintains the safety requirements while eliminating the need for separate duplicate circuits, thereby reducing overall circuit complexity while preserving reliability.
2Speed
If the control circuit directly operates on the waveform of the received signal, then processing speed is improved, but signal distortions increase
Solution Approach 1:
The patent applies preliminary signal conditioning and filtering operations before the control circuit processes the waveform. By pre-processing the received signal to remove distortions and normalize the waveform, the system enables fast direct waveform processing while maintaining signal accuracy and preventing distortion-related errors.
3Reliability
If highly effective filters are provided to detect the received signal, then noise immunity is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements a multi-functional filtering approach where a single filter circuit performs multiple functions: noise filtering, signal conditioning, and frequency selection. This universal filter design provides high noise immunity equivalent to multiple specialized filters while reducing component count and manufacturing cost.
4Device complexity
If the device for monitoring amplitude is connected downstream from the antenna, then distance measurement is simplified, but temperature sensitivity increases
Solution Approach 1:
The patent incorporates temperature sensing and compensation feedback into the amplitude monitoring system. The system continuously monitors temperature variations and dynamically adjusts the amplitude threshold or compensation factors to maintain accurate distance measurement despite thermal drift, thereby eliminating temperature sensitivity while keeping the downstream connection architecture.
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 solution provides a cost-effective, tamper-resistant, and highly reliable safety device with improved distance measurement accuracy and noise immunity, capable of using various RFID transponders, thus enhancing safety and reducing manufacturing costs.
Implementation Method 1
a transceiver device (3) designed to be anchored to the fixed part and adapted to transmit a radio frequency excitation signal (STX) to the transponder (2) and to receive therefrom a return signal (SRX) containing the identification code (IID)
Implementation Method 2
The transceiver device (3) is adapted to process the return signal (SRX) to generate a control signal (SC) having an electric parameter (P) different from those of the return signal (SRX) and whose value changes with a current distance (di) from the transponder (2)
Data Source
AI summary
An electronic safety device for a protection barrier includes a transponder, a transceiver device for receiving a return signal from the transponder, the transponder being movable with respect to the transceiver and adapted to be placed at a current distance, an electric circuit which is switched when the distance is lower or higher than a reference distance and a control and switching system. The transceiver device processes the return signal to generate a control signal with an electric parameter variable in function of the distance. The control signal is a periodic signal with a frequency and has a first spectrum with a middle interval and a second spectrum with lateral intervals shifted with respect the middle interval when the distance is higher than the reference distance, the parameter being associated to a frequency value that comprises either into the middle interval or into one of the lateral intervals.