Double-Sided Weighted Wetness Sensor for Reverse Osmosis Detection

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Solution Overview

Problem

Existing disposable absorbent articles, such as diapers, struggle with limited water absorption and locking ability, leading to liquid reverse osmosis and discomfort, and lack effective sensors for distinguishing between wetness from the top layer and reverse osmosis from the absorbent layer.

Innovation Solution

A sensor with double-sided directional and quantified wet state detection, comprising a sensing strip with upper and lower sensing surfaces, capable of detecting and quantifying wetness on both layers, and adjusting output weights to indicate the urgency of replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a traditional single-sided sensor is used to detect wetness, then the structure is simple, but it cannot distinguish between wetness from the top layer and reverse osmosis from the absorbent layer

Engineering Contradiction:

Improvewet state detection accuracyVSAvoidsensor structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The sensor is divided into two separate sensing surfaces: an upper sensing surface that detects wetness from the top layer and a lower sensing surface that detects reverse osmosis from the absorbent layer. This segmentation allows independent detection of different wetness sources, resolving the contradiction by enabling precise differentiation without requiring a single complex multi-functional sensor.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The detection capability is extended from single-sided to double-sided by adding the vertical dimension of sensing. The sensor now detects wetness from both upper and lower directions simultaneously, transforming a one-dimensional detection approach into a two-dimensional approach that captures comprehensive wet state information.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Quantity of substance

If the absorbent layer absorbs more moisture, then the water absorption capacity increases, but liquid reverse osmosis occurs when saturated

Engineering Contradiction:

Improvemoisture absorption capacityVSAvoidliquid reverse osmosis

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The sensor provides early warning by detecting wetness accumulation in the absorbent layer before saturation occurs. By monitoring the lower sensing surface, the system can alert users to replace the diaper proactively, preventing the harmful reverse osmosis effect before it happens rather than reacting after saturation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The sensor establishes a feedback mechanism that continuously monitors the wet state of both the top layer and absorbent layer. This real-time feedback enables dynamic decision-making about diaper replacement, allowing users to respond to actual wetness conditions and prevent reverse osmosis by timely intervention.

Inventive Principle:

Principle #23Feedback

3Loss of information

If weighted output is applied to prioritize reverse osmosis detection, then replacement urgency is accurately indicated, but the processing complexity increases

Engineering Contradiction:

Improvewet state information accuracyVSAvoidsignal processing

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

Different weight parameters are assigned to signals from the upper and lower sensing surfaces. The lower sensing surface (detecting reverse osmosis) is given higher weight in the composite output, emphasizing the urgency of replacement. This parameter adjustment enables accurate information representation through simple mathematical weighting rather than complex processing algorithms.

Inventive Principle:

Principle #35Parameter changes

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 sensor provides objective and timely replacement signals based on the wet state of both layers, enhancing detection sensitivity and preventing liquid reverse osmosis, thereby improving user comfort and reducing leakage.

Implementation Method 1

detects the capacitance change of the absorbent article through the sensor array to detect the degree of wetness

Methodology Applied

Scientific EffectCapacitance change: Capacitance

Data Source

PatentUS12440394B2Double-sided directional weighted and quantified wet state sensor and related products and methods

Publication Date: 2025.10.14 SHENZHEN CDIAPER TECHNOLOGY LIMITED

AI summary

A sensor for realizing double-sided directional weighted and quantified wet state detection is disclosed, it includes a sensing strip, the sensing strip includes an upper sensing surface and a lower sensing surface, which can respectively realize a quantitative wet state detection on the upper and lower surfaces, the wet state of the upper and lower sides can be weighted and output according to a preset specific gravity, thereby providing a weighted and quantified wet state information related to a specific layer and a specific direction of a specific detection object. A manufacturing method for producing the sensor for realizing double-sided directional weighted and quantified wet state detection, a disposable smart absorbent article that can provide double-sided directional weighted and quantified wet state information, and a manufacturing method of a disposable smart absorbent article that can provide double-sided directional weighted and quantified wet state information are also disclosed.