Hydration Sensor Layer With Porous Fluid Distribution
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Solution Overview
Problem
Existing fluid sensing devices face challenges in achieving uniform distribution of fluid throughout the absorption and distribution layer, leading to non-uniform measurements and increased material and energy costs.
Innovation Solution
A fluid sensing device with a porous fibrous nonwoven matrix layer that absorbs fluid from one surface and uniformly distributes it to the opposite surface, using a thermal heating element to measure thermal response for hydration level determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional absorption layer is used to absorb fluid, then fluid absorption is achieved, but uniform distribution of fluid throughout the layer is not achieved
Solution Approach 1:
The patent employs a porous absorption layer that utilizes capillary action to uniformly distribute fluid throughout the layer. The porous structure allows fluid to be drawn through the material evenly, ensuring consistent fluid distribution across the entire layer rather than localized accumulation, thereby resolving the contradiction between fluid absorption quantity and measurement uniformity.
2Measurement precision
If multiple sensors are used to measure hydration levels across different areas, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a homogeneous fluid distribution throughout the absorption layer using the porous material structure. This homogeneity allows a single sensing element to accurately measure hydration levels representative of the entire layer, eliminating the need for multiple sensors positioned at different locations. The uniform fluid distribution ensures that one measurement point reflects the overall hydration state, thereby reducing device complexity while maintaining measurement precision.
3Measurement precision
If a large sensing element footprint is used to capture representative hydration data, then measurement accuracy is improved, but energy consumption and device size increase
Solution Approach 1:
The uniform fluid distribution achieved through the porous absorption layer enables a small sensing element footprint to capture representative hydration data. Since the fluid is evenly distributed throughout the layer, a compact sensor positioned at any location can accurately reflect the overall hydration level, eliminating the need for large sensing areas. This reduces both the physical size of the sensor and its energy consumption while maintaining measurement accuracy.
4Quantity of substance
If traditional absorption materials are used, then fluid absorption is achieved, but uniform lateral distribution to the opposite surface is not achieved
Solution Approach 1:
The patent uses a porous absorption layer with specific capillary properties that enable fluid to be drawn uniformly through the material and distributed laterally across the entire surface area. The porous structure creates capillary forces that propel fluid from the contact surface through the thickness of the layer and distribute it evenly across the opposite surface, achieving both complete fluid absorption and uniform lateral distribution across the full coverage area.
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 hydration level measurement with a small sensing element footprint by ensuring uniform fluid distribution across the layer, reducing the need for multiple sensors and minimizing energy consumption.
Implementation Method 1
absorbing fluid from the object to a first major surface of the layer and laterally distributing the absorbed fluid throughout the layer and to a second major surface
Implementation Method 2
The layer of fluid absorption and distribution material includes a porous fibrous nonwoven matrix
Implementation Method 3
heating a local region of a fluid absorption and distribution layer and measuring its thermal response. An increase in thermal conductivity and thermal diffusivity of that region when it absorbs fluid
Data Source
AI summary
Fluid sensing devices including a layer of fluid absorption and distribution material are provided. The layer includes a porous fibrous nonwoven matrix for absorbing fluid from the object to the first major surface of the layer and laterally distributing the absorbed fluid throughout the layer and to a second major surface of the layer opposite the first major surface. Hydration sensors are disposed on the second major surface of the layer to measure a hydration level.