RFID Tag Matrix for Rack Orientation Detection
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Solution Overview
Problem
Current laboratory automation systems face difficulties in accurately determining the location and orientation of sample carriers or racks, leading to frustration for operators and inefficiencies in sample handling, as existing solutions often require predefined orientations and limited flexibility.
Innovation Solution
The use of three or more RFID tags on sample carriers, combined with a matrix of RFID reader antennas, allows for the automatic detection of the location and orientation of the carriers, enabling flexible loading and orientation options by aligning tags with reader antennas to determine their position and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a unique feature of the rack is matched with a mating feature on the automation equipment to accomplish unique orientation, then the orientation accuracy is improved, but the ease of operation deteriorates as it may take multiple attempts for the operator to install the rack correctly
Solution Approach 1:
The patent replaces mechanical orientation features (unique physical shapes and mating features) with an RFID-based detection system. RFID tags are attached to racks and read by antennas in the automation equipment, automatically determining rack location and orientation through wireless signal detection rather than mechanical alignment. This substitution eliminates the need for operators to physically align unique features while maintaining accurate orientation detection.
Solution Approach 2:
The system enables self-service by allowing the automation equipment to automatically detect and determine rack orientation without operator intervention. The RFID tags on racks self-identify their position and orientation when placed in the workspace, and the system automatically processes this information to correct any orientation issues, eliminating the need for manual alignment attempts.
2Adaptability or versatility
If conventional RFID solutions are used with limited antenna configurations, then the device complexity is reduced, but the adaptability deteriorates as only two out of four possible orientations can be identified
Solution Approach 1:
The patent transitions from one-dimensional linear antenna arrays to two-dimensional matrix configurations of RFID reader antennas. This dimensional expansion enables the system to detect racks in all four possible orientations (0°, 90°, 180°, 270°) rather than limiting detection to only two orientations, significantly improving adaptability while managing complexity through systematic antenna arrangement.
Solution Approach 2:
The RFID system is designed with universal applicability to detect various rack types and orientations using the same matrix antenna configuration. The system can identify racks placed in any orientation and location within the workspace, making the detection system versatile and adaptable to different operational scenarios without requiring separate specialized systems for each case.
3Measurement precision
If multiple RFID tags are used on racks to define origin and orientation, then the measurement precision of location and orientation is improved, but the device complexity increases due to multiple tags and reader antennas
Solution Approach 1:
The patent segments the RFID system into distinct functional components: multiple RFID tags attached to specific locations on the rack (defining origin and orientation points), and a matrix of reader antennas distributed across the workspace. This segmentation allows each component to perform its specific function independently, improving detection precision while organizing system complexity into manageable segments rather than a monolithic system.
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 solution enhances the flexibility and accuracy of sample handling by allowing operators to load racks in various locations and orientations, improving the automation system's ability to correctly associate positions within the rack, thereby streamlining sample processing and reducing manual handling.
Implementation Method 1
A RFID tag on the rack can be aligned with a reader antenna in the RFID reader antenna matrix... The RFID reader antennas may be spaced apart from each other such that neighboring RFID tags to an RFID tag that is activated by a reader antenna are not activated by the reader antenna
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A first embodiment of the invention relates to systems and methods for detecting the orientation of sample carriers using two or more RFID tags. One or two dimensional matrix of equally spaced RFID reader antennas may be positioned beneath or within an area on which racks are placed. The first RFID tag defines the origin of the sample carrier and its geometry. The second and additional RFID tags define the orientations of the sample carrier relative to the matrix of the RFID reader antennas. At least two of the tag antennas on the rack align uniquely with two antennas on the reader matrix. The system energizes each reader antenna and associates the RFID tags aligned with them to the RFID reader antenna's physical position.