RFID Tag Placement in Multi-Core Cable for Orientation-Independent Detection
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Solution Overview
Problem
Existing methods for remotely detecting multi-core electrical cables are limited by the need for access to cables, interference from shielding, and orientation-dependent detection, which reduces effectiveness and complicates installation and identification, especially in crowded or buried applications.
Innovation Solution
A multi-core electrical cable with a support structure housing RFID tags between conductors, where the tags are positioned to maximize mechanical cohesion and minimize interference from shielding, allowing for orientation-independent detection and integration into the cable without protrusions, enabling efficient detection over a significant range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID tags are integrated into the cable sheath, then cable identification is enabled, but detection range is reduced due to shielding interference
Solution Approach 1:
The patent positions RFID tags in the radial dimension between conductors rather than on the outer sheath surface, creating a three-dimensional arrangement that exploits the space within the cable cross-section. This dimensional change allows tags to be shielded from external interference while maintaining detection capability through the cable insulation layers.
Solution Approach 2:
The RFID tags are nested within the cable structure between the conductors and outer sheath, similar to nested dolls. This nesting integrates the detection function into the existing cable architecture without adding external protrusions, and the tags are positioned within the protective envelope formed by the cable insulation and shielding layers.
2Ease of operation
If RFID tags are placed on the outer sheath, then detection is possible, but cable installation is complicated by protrusions
Solution Approach 1:
The RFID tags are nested within the cable cross-sectional space between conductors and outer sheath, eliminating external protrusions. This allows the cable to be installed in standard conduits and sheaths without modification, while the nested tags remain accessible for detection through the insulation layers.
Solution Approach 2:
The invention transitions from two-dimensional surface mounting on the outer sheath to three-dimensional positioning within the cable volume. This dimensional change allows tags to be embedded in the available space without affecting the cable's external dimensions or installation characteristics.
3Length of moving object
If RFID tags are integrated during cable manufacture, then detection range is improved, but antenna orientation becomes uncontrolled
Solution Approach 1:
The patent uses multiple RFID tags positioned at different angular positions around the cable circumference rather than a single tag. This segmentation ensures that at least one tag will be optimally oriented relative to any approaching reader, compensating for the inability to control cable orientation during installation.
Solution Approach 2:
The detection system uses a composite arrangement of multiple RFID tags with different orientations integrated into the cable structure. This composite approach ensures detection capability regardless of the cable's final installation orientation, as the multiple tags provide redundant detection paths.
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 allows for reliable, orientation-independent detection of multi-core electrical cables, even when buried or crowded, with improved range and reduced interference from shielding, facilitating accurate identification and connection without additional installation complexities.
Implementation Method 1
the RFID tag only responds to the reader if it receives a quantity of magnetic flux sufficient to allow its activation. This assumes that the RFID tag's antenna intercepts enough magnetic field lines
Implementation Method 2
This metallic casing can be earthed and then makes it possible to transport towards earth any short-circuit current
Implementation Method 3
An RFID tag includes an antenna for exchanging radio frequency signals with a reader
Data Source
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Figure 6~7
AI summary
The invention relates to a cable (5) comprising at least two electrical conductors (6) and a detection device (10) including: a support (20) held between the two electrical conductors and having an external face (28); and at least one RFID antenna mechanically linked to the support on the side of the external face.