Fabric Pressure Sensor Arrays Using Intersecting Conductive Strips
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Solution Overview
Problem
Conventional pressure sensors, such as those made from piezoelectric crystals or ceramics, are obtrusive and uncomfortable for daily use, making them unsuitable for monitoring sitting or sleeping positions, which are crucial for health applications like back pain prevention and ulcer prevention, as they compromise personal privacy and are not economically viable for widespread deployment.
Innovation Solution
A fabric-based pressure sensor array is developed, comprising elongated conductive strips on a textile sheet with variable resistivity, allowing for the creation of multiple pressure sensors at intersections, which can be integrated into everyday textile products, providing unobtrusive and comfortable monitoring solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure sensors made from piezoelectric crystals or ceramics are used, then measurement precision is improved, but device complexity and discomfort increase making them unsuitable for daily use
Solution Approach 1:
The patent changes the fundamental material parameter from rigid piezoelectric crystals/ceramics to flexible conductive textiles. The conductive strips are coated on a flexible substrate, transforming the sensor from a rigid component to a flexible one that can conform to body contours, thereby resolving the contradiction between measurement precision and device complexity/comfort
Solution Approach 2:
The patent employs composite material structure by combining conductive strips with flexible textile substrate. This composite approach allows the sensor to maintain electrical conductivity while achieving flexibility and comfort, enabling daily use without compromising measurement capability
2Measurement precision
If conventional pressure sensors are used for monitoring, then measurement precision is improved, but ease of operation deteriorates due to obtrusiveness and discomfort
Solution Approach 1:
The patent implements flexible thin film structure by coating conductive strips on a flexible substrate that can conform to body surfaces. This flexible design eliminates the obtrusiveness of conventional rigid sensors, allowing continuous wearable monitoring for sitting and sleeping positions without compromising user comfort or measurement precision
3Measurement precision
If conventional pressure sensors are deployed, then measurement precision is improved, but manufacturing cost increases reducing economic viability
Solution Approach 1:
The patent adopts inexpensive conductive textile materials and simple coating processes instead of expensive piezoelectric crystals or ceramics. The conductive strips can be manufactured using low-cost techniques such as screen printing or spraying, significantly reducing material and manufacturing costs while maintaining adequate measurement precision for posture monitoring applications
Solution Approach 2:
The patent changes the material composition parameter from expensive piezoelectric materials to inexpensive conductive textiles, transforming the sensor into an economically viable product for widespread deployment in health monitoring applications
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 fabric-based pressure sensor array accurately monitors sitting and sleeping positions, reducing manufacturing complexity and cost, while being comfortable and unobtrusive, enabling effective health monitoring and alerts for posture changes to prevent health issues like back pain and pressure ulcers.
Implementation Method 1
the textile sheet having a variable resistivity in response to applied pressure so as to define M×N pressure sensors at locations corresponding to the M×N intersections
Data Source
AI summary
A fabric-based pressure sensor array includes: (1) a first layer including M elongated conductive strips coated thereon; (2) a second layer including N elongated conductive strips coated thereon, the M elongated conductive strips extending crosswise relative to the N elongated conductive strips to define M×N intersections; and (3) a unitary textile sheet extending between the first layer and the second layer so as to overlap the M×N intersections, the textile sheet having a variable resistivity in response to applied pressure so as to define M×N pressure sensors at locations corresponding to the M×N intersections.