Water Filter Leak Detection Using RFID and Capillary Wicking
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Solution Overview
Problem
Water filter assemblies often experience leaks due to improper installation or exposure to high water pressures, which can be difficult to detect, especially in remote locations within refrigerator appliances, leading to operational issues and potential damage.
Innovation Solution
A system utilizing an RFID tag and an absorbent material to detect liquid leaks, where the absorbent material wicks liquid from a collection point to the RFID tag, allowing for remote detection of leaks by disrupting the signal communication between the RFID reader and tag, indicating the presence of liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RFID tag is positioned at the liquid collection location, then the leak detection precision is improved, but the device complexity increases due to the need for direct contact between the tag and liquid
Solution Approach 1:
An absorbent material is introduced as an intermediary between the liquid collection location and the RFID tag. This absorbent material wicks liquid from the collection location to the RFID tag, enabling indirect detection. The RFID tag remains spaced apart from the liquid collection location, simplifying the device structure while maintaining detection capability through the intermediary absorbent material that transfers liquid to the tag's location.
2Ease of operation
If the RFID tag is spaced apart from the liquid collection location, then the ease of operation is improved by allowing remote detection, but the measurement precision deteriorates due to the distance from the leak source
Solution Approach 1:
The absorbent material serves as a mediator that bridges the gap between the liquid collection location and the remotely positioned RFID tag. It actively transports liquid through capillary action to the tag's location, ensuring that the RFID tag can detect liquid presence even when spaced apart from the leak source, thus maintaining both operational ease and detection precision.
Solution Approach 2:
The system replaces direct mechanical contact or proximity-based detection with a capillary action-based liquid transport mechanism. The absorbent material uses capillary forces to move liquid to the RFID tag, eliminating the need for the tag to be in direct contact with or immediately adjacent to the liquid collection location, thereby enabling remote detection while maintaining 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 effective detection of liquid leaks in water filter assemblies, even when the RFID tag is spaced apart from the leak source, improving leak detection accuracy and reducing the risk of damage from undetected leaks.
Implementation Method 1
features for wicking or otherwise transferring liquid from the liquid collection location to the RFID tag
Data Source
AI summary
A system for detecting a liquid, such as liquid water, is provided. The system includes an RFID tag spaced apart from a liquid collection location. The system also includes features for wicking or otherwise transferring liquid from the liquid collection location to the RFID tag. A water filter assembly with features for detecting water leaks is also provided.