Water-Soluble Insulated Wire Moisture Detection System
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Solution Overview
Problem
RFID moisture sensors face issues with reading distance and reliability due to factors like reader power, tag antenna size, and obstructions, which affect their performance in various applications.
Innovation Solution
A moisture detection system using a water-soluble insulating coating on conductive materials like stainless steel or carbon fiber wires, which shorts when exposed to moisture, and water-soluble conductive materials doped with carbon nanotubes or silver, allowing for flexible and battery-free moisture sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If RFID tag antenna size is increased to improve reading distance, then reading distance is improved, but device size and complexity increase
Solution Approach 1:
The patent replaces the traditional RFID electromagnetic field-based detection system with a simple electrical conductivity-based detection system. Instead of using complex RF antennas and readers, the invention uses basic conductive probes that detect moisture through electrical conduction, eliminating the need for large antennas and reducing device complexity while maintaining effective detection range
Solution Approach 2:
The invention changes the detection parameter from electromagnetic field interaction (RFID) to electrical conductivity measurement. By measuring the conductivity change when moisture bridges the probes, the system achieves reliable detection without requiring large antenna structures, thus improving reading distance capability while reducing device size
2Reliability
If RFID tag antenna size is increased to improve reliability, then reliability is improved, but device size and complexity increase
Solution Approach 1:
The patent replaces the complex RFID electromagnetic system with a simple electrical conductivity detection system using basic conductive probes. This substitution eliminates the reliability issues associated with RF signal interference and antenna orientation, providing consistent and reliable moisture detection through direct electrical measurement
Solution Approach 2:
The detection system utilizes the moisture itself as the conductive medium. When moisture is present, it naturally creates an electrical pathway between the probes, providing inherent reliability without requiring complex signal processing or large antennas to ensure consistent detection
3Measurement precision
If water soluble insulating coating is used to detect moisture, then sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent uses composite materials consisting of conductive particles (such as carbon black or metal flakes) dispersed in a water-soluble polymer matrix. This composite structure provides both the sensitivity needed for early moisture detection through conductivity change and the water-soluble property for automatic signal generation, while maintaining relatively simple application as a coating
Solution Approach 2:
The invention changes the electrical parameter of the coating from insulating to conductive upon moisture exposure. The water-soluble conductive coating transitions from a high-resistance state to a low-resistance state when moisture dissolves the polymer matrix and releases conductive particles, providing sensitive detection without complex device structure
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 reliable and flexible moisture detection with increased sensitivity and reduced size, enabling effective monitoring in diverse environments without the need for batteries, improving reading distance and reliability.
Implementation Method 1
A preferred embodiment uses a water soluble insulating coating on a conductive material such as, but not limited to, a stainless steel wire, silver wire or carbon fiber
Implementation Method 2
Another embodiment incorporates water soluble materials doped with conductive material such as, but not limited to, carbon nano tubes or silver micro flakes, fabricating a moisture soluble conductor
Data Source
AI summary
Wireless moisture detection system using water soluble insulated wire or water soluble conductors as sensor inputs to a programmed microcontroller to determine if the water soluble sensors have been penetrated by moisture dissolving the soluble materials and changing the electrical characteristics of the sensor providing an interrupt to the microcontroller to signal the presence of moisture for the monitor to wirelessly communicate to the monitoring system.