Flexible Pressure Mapping Mat With Micro-Rough Wide-Range Sensing
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Solution Overview
Problem
Traditional pressure sensors are rigid, bulky, and limited to single-point pressure monitoring, lacking flexibility and sensitivity across a wide range of pressures, making them unsuitable for applications requiring thin, flexible form factors and pressure mapping capabilities.
Innovation Solution
A flexible planar mat system with composite piezoelectric-dielectric layers and embedded conductive particles, configured to provide a wide pressure detection range of 0-3000 kPa, utilizing a micro-rough surface structure for both point-to-point and area-to-area contact modes, and integrated with a data collector and processor for dynamic pressure mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional rigid pressure sensors are used, then single point pressure monitoring is achieved, but flexible applications and pressure mapping capabilities are lost
Solution Approach 1:
The patent employs flexible substrates (polymer films) as the base structure for pressure sensors, replacing traditional rigid substrates. This enables the sensors to be bent, stretched, and conform to curved surfaces, achieving flexible applications and pressure mapping capabilities while maintaining sensor functionality through the thin-film structure
Solution Approach 2:
The patent divides the pressure sensing area into multiple independent sensor elements arranged in a grid pattern on the flexible substrate. Each element can independently measure pressure at its location, enabling pressure mapping across the entire surface while keeping each individual sensor element simple in structure
2Adaptability or versatility
If pressure sensors with narrow pressure range sensitivity are used, then specific pressure levels can be detected, but continuous wide range pressure scenarios cannot be measured
Solution Approach 1:
The patent uses conductive particles embedded in the flexible substrate whose electrical conductivity changes with applied pressure. The particle concentration and distribution are optimized to provide linear response across a wide pressure range (0-3000 kPa), allowing continuous measurement from low to high pressures without saturation or loss of sensitivity
Solution Approach 2:
The patent creates a composite structure combining flexible polymer substrate material with conductive particles (such as carbon black, metal particles, or conductive polymer). This composite material exhibits pressure-dependent electrical properties that enable wide-range pressure measurement while maintaining measurement precision through the synergistic effect of the flexible matrix and conductive fillers
3Adaptability or versatility
If textile-based pressure sensor arrays are used, then soft and curved contact surfaces can be measured, but accuracy and consistency are affected by fabric irregularities and deformations
Solution Approach 1:
The patent replaces textile-based flexible substrates with engineered flexible polymer films that have uniform, smooth surfaces. This provides consistent mechanical properties and predictable electrical behavior while maintaining flexibility and the ability to conform to curved surfaces, eliminating the irregularities present in fabric-based sensors
4Measurement precision
If conventional pressure sensors are used, then pressure measurement is possible, but production processes are complex and costly
Solution Approach 1:
The patent employs solution-processable conductive particle suspensions that can be applied to flexible substrates using simple coating techniques such as dip-coating, spray-coating, or print-coating. The particles are dispersed in a liquid medium and deposited as a thin layer, then cured to form the pressure sensing element. This approach replaces complex multi-step manufacturing processes with single-step coating operations, significantly simplifying production while maintaining measurement 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
The system achieves high sensitivity and accuracy in pressure distribution mapping, with a flexible design capable of detecting pressures from 50 kPa to 3000 kPa, and provides durable, facile production with a thickness less than 0.30 mm, suitable for various applications including human-body interaction and product flatness analysis.
Implementation Method 1
The relative size of the conductive particles and the dielectric particles is configured such that an interface between a composite piezoelectric-dielectric layer and an electrode layer has a micro-rough surface such that low pressure loads of 50 kPa or less generate a contact area of 0-10 percent of a layer surface area and high pressure loads of 50-3000 kPa generate a contact area of at least 10-100 percent of a layer surface area
Implementation Method 2
Each of the first and second composite piezoelectric-dielectric layers includes an elastomeric matrix. Embedded in the elastomeric matrix is a first set of conductive particles
Data Source
AI summary
A pressure distribution monitoring flexible planar mat system with a wide pressure measuring range. The flexible planar mat includes a first electrode layer and a first composite piezoelectric-dielectric layer with a second composite piezoelectric-dielectric layer facing the first layer and a second electrode layer. Each of the first and second composite piezoelectric-dielectric layers includes an elastomeric matrix with conductive and dielectric particles embedded therein. The relative size of the conductive particles and the dielectric particles creates a micro-rough interface between these layers and the electrode layers resulting in a range of contact areas, permitting detection between 0 and 3000 kPa. The flexible planar mat system further includes a data collector that collects a pressure signal from the mat. A pressure distribution data processor receives and calculates data from the data collector and creates a two-dimensional pressure map from the flexible planar mat.