Capacitance-Based RFID Sensing for Humidity and Gas Exposure
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Solution Overview
Problem
Commercial products are susceptible to damage or quality loss due to excessive humidity or gas exposure, with existing monitoring methods being inadequate for detecting and indicating such conditions effectively.
Innovation Solution
A capacitance-based RFID tag system incorporating a humidity or gas indicator with electrodes and a dielectric material that changes capacitance in response to environmental stimuli, allowing for real-time monitoring and indication of humidity or gas levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional humidity or gas detection methods are used, then detection capability is provided, but device complexity and cost increase
Solution Approach 1:
The patent combines RFID tag functionality with humidity/gas sensing capabilities into a single integrated device. The RFID tag's antenna and circuitry serve dual purposes: communication and environmental sensing, eliminating the need for separate detection devices and reducing overall system complexity.
Solution Approach 2:
The RFID tag is designed to perform multiple functions simultaneously - it acts as both an identification/tracking device and an environmental sensor. The single device can detect humidity, detect gas presence, and provide wireless communication, making it a universal monitoring solution that replaces multiple specialized devices.
2Reliability
If active RFID tags with power sources are used, then detection reliability is improved, but energy consumption and device complexity increase
Solution Approach 1:
The passive RFID tag harvests energy from the electromagnetic field generated by the reader's interrogation signal. This self-powered approach eliminates the need for batteries or other power sources, allowing the tag to autonomously power its sensing and communication functions without external energy supply.
Solution Approach 2:
The patent replaces the mechanical/chemical energy storage system (batteries) with an electromagnetic energy harvesting mechanism. The tag converts electromagnetic energy from the reader into electrical energy needed for operation, substituting a passive electromagnetic system for an active power supply 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
The system provides accurate and reliable detection of humidity or gas exposure, enabling timely alerts and reducing waste by ensuring product quality and safety, applicable in various industries including food safety and battery monitoring.
Implementation Method 1
The dielectric material may be configured to have a change in its dielectric constant responsive to exposure to an environmental stimulus, which may be at least one of humidity or the presence of a gas
Implementation Method 2
The change in the dielectric constant of the dielectric material may change a capacitance of the humidity or gas indicator, causing the integrated circuit to indicate the presence of the environmental stimulus
Data Source
AI summary
An RFID tag system includes an antenna, an integrated circuit electrically connected to the antenna, and a humidity or gas indicator being electrically connected to the antenna and the integrated circuit. The humidity or gas indicator includes a first electrode, a second electrode, a dielectric material, and a gap between the first electrode and the second electrode. At least a portion of the gap contains the dielectric material. The dielectric material is configured to have a change in its dielectric constant responsive to exposure to an environmental stimulus, which may be at least one of humidity or the presence of a gas. The change in the dielectric constant of the dielectric material changes a capacitance of the humidity or gas indicator, causing the integrated circuit to indicate the presence of the environmental stimulus.