Optoelectronic Sensor RFID Reader Object Association
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Solution Overview
Problem
Current RFID-based automated identification systems in logistics face challenges with ambiguous object association, high error rates, and inefficient channel usage due to far-range interference and limited frequency channels, especially in environments with multiple readers.
Innovation Solution
An optoelectronic sensor, such as a laser scanner, determines the movement pattern and geometry of objects, activating the RFID reader only when the object follows a preset movement pattern, thereby reducing incorrect readings and optimizing channel usage by ensuring the RFID reader is active only during relevant data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RFID readers are used to read transponders in far ranges, then reading range is improved, but association accuracy deteriorates due to reflections and interference
Solution Approach 1:
A laser scanner is introduced as an intermediary device to detect the movement pattern of objects. The laser scanner provides additional information about object motion that serves as a mediator to verify whether a read transponder actually belongs to the intended object, resolving the association ambiguity caused by far-range RFID readings
Solution Approach 2:
The system uses feedback from the laser scanner's movement pattern detection to validate RFID readings. Only readings that coincide with detected object movement are accepted, creating a feedback mechanism that filters out false associations from reflected signals
2Area of stationary object
If multiple RFID readers are installed in goods depots, then identification coverage is improved, but channel coordination complexity increases due to limited frequency channels
Solution Approach 1:
Each RFID reader equips itself with a laser scanner that independently detects movement patterns in its vicinity. This self-service approach allows readers to autonomously determine when to activate, eliminating the need for complex centralized channel coordination while multiple readers operate simultaneously
Solution Approach 2:
The laser scanner performs preliminary detection of object movement before triggering the RFID reader. This preliminary action ensures that readers are activated only when necessary, reducing channel conflicts and coordination overhead among multiple readers
3Ease of operation
If light barriers are used to trigger RFID readers, then activation simplicity is improved, but reading accuracy deteriorates due to inability to determine direction and object type
Solution Approach 1:
The simple light barrier trigger mechanism is replaced with an optoelectronic laser scanner that uses optical fields to detect movement patterns. This substitution provides directional and geometric information while maintaining automated activation, improving reading accuracy without significantly complicating operation
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
This approach significantly improves reading accuracy and efficiency by filtering out irrelevant data and reducing channel search time, allowing for a higher number of RFID readers to operate without coordination issues, especially in complex logistical applications.
Implementation Method 1
an optoelectronic sensor, in particular a laser scanner, determines a movement pattern of an object
Implementation Method 2
the transponder is stimulated to radiate the stored information by electromagnetic radiation of the reading device
Implementation Method 3
generate electromagnetic radiation independently
Implementation Method 4
The radar sensor measures the direction of movement via the Doppler effect
Data Source
AI summary
A device (10) is provided for the reading out of information from a transponder (14) arranged at an object (12), said device comprising an optoelectronic sensor (24), a reading device (16) able to excite the transponder (14) to radiate the information and able to read out the radiated information and a control (26) which is made for a control of the reading device (16) and of the sensor (24) as well as for an evaluation of the read out information.In this connection, the optoelectronic sensor (24) can determine a movement pattern of the object (12) and the control (26) is made only to evaluate the read out information with objects (12) of a preset movement pattern.A corresponding method is furthermore described.