Dynamic RFID Tunnel System for Missed Item Recovery
Solution Overview
Problem
RFID tunnel systems face challenges in accurately reading RFID tags within densely packed containers due to high speeds and power settings, leading to missed items and unnecessary recirculation, which causes production delays and inefficiencies.
Innovation Solution
A dynamic RFID tunnel system employing supplemental software filtering techniques and intelligent decision-making processes for a secondary RFID read, allowing for slower speed or higher power settings in the second tunnel to improve read accuracy without significantly impacting production flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID readers are run at higher power settings to capture missed items, then the successful read percentage improves, but extraneous and unintended RFID reads occur
Solution Approach 1:
The system divides the reading process into two distinct stages: a first RFID tunnel read at lower power settings for normal operation, and a second supplemental read at higher power settings specifically targeted at recovering missed items. This segmentation allows each reading phase to operate at optimal power levels without causing harmful effects to the other.
Solution Approach 2:
The patent introduces an intermediary filtering system that processes the raw data from both reading phases. This filtering mechanism identifies and eliminates extraneous reads from the high-power second read, keeping only valid RFID tag readings, thereby resolving the contradiction between capturing missed items and avoiding unintended reads.
2Measurement precision
If cartons are recirculated through the RFID tunnel to capture missed items, then the successful read percentage improves, but production delays occur
Solution Approach 1:
The system performs a preliminary second RFID read at higher power settings while the carton is still moving through the tunnel at normal speed. This preliminary action captures missed items before the carton would otherwise require recirculation, thereby improving the successful read percentage without causing production delays associated with stopping and recirculating cartons.
Solution Approach 2:
The patent implements a dynamic reading strategy where the system adapts the reading approach based on real-time conditions. The second supplemental read is triggered dynamically based on detection of missed items from the first read, allowing the system to optimize between thorough reading and production flow speed depending on the specific situation.
3Measurement precision
If the conveyer speed is reduced to allow adequate time for RFID inlays to energize, then the successful read percentage improves, but production efficiency decreases
Solution Approach 1:
The system changes the power parameter of the RFID reader in the second tunnel to a higher setting, compensating for the fast conveyer speed. This parameter change allows the RFID inlays to be successfully energized and read even as they quickly pass through the tunnel, maintaining both production efficiency and successful read percentage.
Solution Approach 2:
The patent implements periodic or pulsed high-power reading in the second tunnel, synchronized with the passage of cartons. This periodic action provides adequate energy bursts to energize RFID inlays momentarily, ensuring successful reads without requiring the conveyer to slow down continuously, thereby maintaining production efficiency.
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 enhances the successful read percentage of RFID inlays within containers while minimizing recirculation and manual inspections, maintaining production efficiency and ensuring accurate inventory without damaging the items.
Implementation Method 1
radio-frequency identification is the use of electromagnetic energy to stimulate a responsive device (known as an RFID 'tag' or transponder) to identify itself
Implementation Method 2
electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method for recovering missed RFID tagged items in an RFID tunnel environment is disclosed. The method comprises using a dynamic RFID tunnel system comprised of a first RFID tunnel and a second RFID tunnel to inventory one or more containers of items having RFID tags. A first RFID read is performed in the first RFID tunnel and compared to expected inventory stored in a database. If the comparison does not match, a second RFID read is performed in a subsequent RFID tunnel at a higher RFID read power and by moving the containers slower than the speed of movement of the containers into the first RFID tunnel. If a comparison of the second read to the expected containers' inventory still does not match, the containers may be recirculated through the tunnel system or may be diverted to an exceptions audit depending on how the system is configured.