Moisture Detection Using Multilayer Conductive Nonwoven Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing moisture detection devices are prone to false alarms due to wrinkling or folding, and their electronic components are costly and susceptible to corrosion, requiring frequent replacement, while they only detect moisture when the absorbent material reaches saturation, allowing for imminent fluid spread.
Innovation Solution
A multilayer sensor system with two conductive layers and a separator layer, forming a closed circuit in a dry state that opens or shorts when moisture is present, and can be integrated into articles of clothing or packages for remote notification, using non-woven fabrics with conductive additives to prevent corrosion and false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive electrodes and electronic components are disposed onto absorbent materials to detect moisture, then moisture detection capability is provided, but the device is prone to false alarms due to wrinkling or folding and requires frequent replacement due to corrosion
Solution Approach 1:
The patent extracts the conductive elements from traditional electrode formats and integrates them directly into the absorbent material structure itself. The absorbent material is formed with conductive fibers or coatings that are permanently embedded, eliminating separate electrodes that could corrode or short circuit. This integration ensures the conductive elements remain stable and functional throughout the device lifespan without requiring replacement.
Solution Approach 2:
The patent creates a composite absorbent material that combines absorbent properties with conductive properties in a single integrated structure. The material includes absorbent polymers or fibers mixed with conductive additives, creating a unified component that both absorbs moisture and provides electrical conductivity without the need for separate electronic components, thereby preventing corrosion and extending device life.
2Reliability
If traditional conductive electrodes are used in moisture detection devices, then detection function is achieved, but cost increases significantly and replacement frequency increases
Solution Approach 1:
The patent merges the absorbent material and conductive electrode functions into a single integrated component. The absorbent material itself is formed with conductive properties through embedded fibers or coatings, eliminating the need for separate electronic components and assembly steps. This consolidation reduces manufacturing complexity and cost while maintaining reliable detection functionality.
Solution Approach 2:
The patent employs inexpensive conductive additives and materials that can be easily incorporated into the absorbent material during manufacturing. The conductive elements are designed to be cost-effective and integrated directly into the disposable absorbent component, eliminating the need for expensive, corrosion-prone metal electrodes and reducing overall device cost.
3Measurement precision
If moisture detection relies on absorbent material saturation, then detection is triggered, but false alarms occur when absorbent material is wrinkled or folded
Solution Approach 1:
The patent replaces traditional mechanical electrode contact-based detection with a distributed conductive network embedded in the absorbent material. Instead of relying on physical contact between separate electrodes that can short circuit when folded, the conductive elements are continuously distributed throughout the material matrix, maintaining electrical pathways that respond to moisture without being affected by mechanical deformation or wrinkling.
4Reliability
If multiple conductive layers are used to prevent false alarms, then detection reliability improves, but device complexity increases
Solution Approach 1:
The patent applies conductive properties locally throughout the absorbent material structure rather than using separate discrete conductive layers. The conductive fibers or coatings are distributed at specific locations within the material matrix where moisture detection is needed, creating a functional conductive network that prevents false alarms without requiring complex multi-layer constructions. The conductive elements are integrated at the appropriate depths and positions within the absorbent material itself.
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 effectively detects moisture at any point, reducing false alarms and extending the lifespan of the devices by preventing corrosion, and can be used for both moisture detection and electrical grounding applications.
Implementation Method 1
The conductive layers form an open or shorted circuit when moisture is present on both of the conductive layers
Implementation Method 2
The absorbent material may be formed from a hydrophobic material and the conductive electrodes may be disposed on a surface of the absorbent material
Data Source
AI summary
Disclosed herein are systems and devices which are capable of detecting moisture and remotely indicating when the presence of moisture is detected. The systems utilize multilayer sensors that consist of two conductive layers surrounding an insulating, spacer layer. Nonwoven materials with conductive additives have shown particular advantages for use in constructing the conductive sensor layers. The system includes transmitter and receiver devices configured to provide indicators when moisture is detected through audible signals, vibration, visible signals or through notifications displayed on a software application. The conductive layers can also be placed in signal communication with a human body to draw electrical current to ground. Removing current results in the reduction of pain, improved sleep, and other physiological changes of clinical significance.