RFID Switch Layout for Small-Item Tracking and Pressure Sensing
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Solution Overview
Problem
Current RFID technologies face challenges in tracking and managing small items like pills or grains, where attaching individual RFID sensors is impractical, and in sensing material levels or pressures effectively.
Innovation Solution
The development of RFID-enabled systems that include an enclosure, collector, interrogator, and RFID field sensors, which generate and respond to electromagnetic fields to transmit signal strength indications for analysis, allowing for non-invasive tracking and pressure sensing applications, including in dispensers and pressure-sensitive keypads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual RFID sensors are attached to small items for tracking, then tracking capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The system divides the tracking function into multiple distributed RFID sensor nodes placed throughout the enclosure, each independently detecting electromagnetic fields. This segmentation allows tracking without requiring complex individual sensors on each small item, instead using collective detection from multiple simple sensor nodes.
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary medium between the RFID sensors and the items being tracked. The sensors detect changes in the electromagnetic field caused by the presence or movement of items, eliminating the need for direct sensor attachment to each item while maintaining tracking capability.
2Measurement precision
If RFID sensors are distributed throughout the enclosure for pressure sensing, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The RFID sensor nodes are designed to perform multiple functions simultaneously: tracking small items, sensing material levels, and detecting pressure changes. This multi-functionality reduces the need for separate specialized sensors for each measurement type, thereby reducing overall device complexity while maintaining comprehensive measurement capability.
Solution Approach 2:
The system detects pressure changes by monitoring variations in electromagnetic field parameters (such as signal strength or phase) rather than using dedicated pressure sensing mechanisms. This parameter change approach allows pressure sensing using the same electromagnetic field infrastructure already in place for other measurements.
3Measurement precision
If direct sensor attachment is used for tracking small items, then tracking accuracy is improved, but ease of manufacture deteriorates
Solution Approach 1:
Instead of attaching physical sensors to each item, the system creates an electromagnetic field representation of the item's presence and position. The RFID sensors detect the electromagnetic field signature that 'copies' or represents the physical state of items in the enclosure, eliminating the need for physical sensor attachment while maintaining tracking accuracy.
Solution Approach 2:
The patent replaces the mechanical approach of attaching physical sensors to items with an electromagnetic field-based detection system. The electromagnetic fields substitute for the mechanical sensor-item contact, providing tracking capability without the manufacturing complexity of sensor attachment while maintaining measurement precision.
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
Enables accurate tracking of small items and monitoring of material levels and pressures without the need for direct sensor attachment, improving inventory management and sensing capabilities.
Implementation Method 1
The interrogator is configured to transmit an incident signal to the collector, causing the collector to generate an electromagnetic field within the enclosure
Implementation Method 2
One or more of the RFID sensors respond to the electromagnetic field by transmitting, via the collector, a reflected signal to the interrogator, the reflected signals containing the individual identifications of the responding RFID sensors
Data Source
AI summary
Disclosed is an apparatus for use as a switch. In one embodiment, the switch comprises at least one RFID tag, each RFID tag comprising an antenna element and an RFID integrated circuit, at least one source element, and at least one lever arm. Each lever arm is connected to one of the RFID tags, and each lever arm is capable of two positions. One of the positions places the lever arm and the RFID tag connected thereto into alignment with the source element. Other embodiments are also described.