RFID Tag Location via IR Beam Flagging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RFID devices struggle to accurately locate specific RFID tags in a given area, especially in retail environments, due to the lack of line-of-sight requirements and the difficulty in distinguishing which tags are being read among many, leading to time-consuming inventory operations.
Innovation Solution
Incorporating an infrared transmitter with a narrow beam on handheld RFID readers that includes an IR sensor on the RFID tags, allowing the tags to flag their data when illuminated, enabling the reader to determine the direction of the tag relative to the transmitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RFID reading is used without line-of-sight requirement, then reading capability is improved, but location determination capability deteriorates
Solution Approach 1:
The system segments the RFID reading function into two independent subsystems: an omnidirectional RF reading component and a directional IR detection component. The RF antenna provides 360-degree tag detection without line-of-sight requirements, while the IR transmitter with narrow beam provides directional information. This segmentation allows each subsystem to optimize its specific function while collectively solving both reading capability and location determination.
Solution Approach 2:
The infrared transmitter acts as an intermediary that bridges the gap between RF reading capability and directional location determination. The IR beam serves as a mediator that carries directional information from the reader to the tag, enabling the system to determine tag direction without compromising the line-of-sight independence of the RF reading function.
2Productivity
If RFID tags are made ubiquitous, then identification capability is improved, but tag distinction capability deteriorates
Solution Approach 1:
The system adds a directional dimension to the RFID identification process. While RF signals provide identification data, the IR narrow beam adds spatial orientation information, creating a two-dimensional identification space (identification + direction). This allows users to distinguish which direction a tag is located in, making it easier to identify specific tags among many ubiquitous tags.
3Measurement precision
If narrow beam IR transmitter is added to RFID reader, then location precision is improved, but device complexity increases
Solution Approach 1:
The system merges the IR transmitter and RF reader into a single integrated device. The IR transmitter, RF antenna, and processing unit are combined in one handheld reader, allowing the user to perform both RF reading and directional detection with a single device rather than requiring separate systems.
Solution Approach 2:
The handheld reader is designed as a universal device that performs multiple functions: RF tag identification, directional detection via IR, and integrated processing. This multi-functionality reduces the need for multiple separate devices and simplifies the overall system architecture despite the added capabilities.
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 allows for precise location determination of RFID tags, reducing the time and effort required to find specific items by distinguishing which tags are directly in front of the reader, even without line-of-sight requirements.
Implementation Method 1
an IR transmitter configured to output an IR beam in a first direction
Implementation Method 2
RFID tags having an IR sensor that senses the IR beam
Data Source
AI summary
Provided are RFID systems, methods and RFID tags according to various aspects. An infrared (IR) beam, from an IR transmitter, is outputted in a first direction so that an RFID tag with an IR sensor adds a flag to stored data in the RFID tag in response to the RFID tag's IR sensor detecting the IR beam. An RF interrogation signal is outputted by an RFID reader, and a response is received from the RFID tag to the RF interrogation signal. It is determined whether the flag is contained in the RFID tag's response to the RF interrogation signal, and if so, the RFID tag is determined to be in the first direction relative to the IR transmitter.