Flexible Pressure Sensor with Thread Electrodes
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Solution Overview
Problem
Current pressure-sensitive sensors face challenges in designing custom and tunable form-factors for complex geometries, especially for applications on the human body, where they need to tolerate excessive use without causing discomfort or material fatigue, and must seamlessly integrate into clothing or skin without pain or disturbances.
Innovation Solution
The development of flexible pressure sensors with a multi-layer construction, including a flexible support material, a sensing material, and an insulating material, coupled using conductive and non-conductive threads, allowing for orthogonal sensing capabilities and integration into wearable devices like shoes or clothing, using techniques such as electrospinning and spraying for enhanced sensitivity and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pressure-sensitive sensors are designed for custom form-factors to fit complex geometries, then adaptability is improved, but device complexity increases
Solution Approach 1:
The sensor is divided into multiple functional layers including a flexible support layer, sensing material layer, and insulating layer. Each layer serves a specific function and can be independently optimized, allowing custom form-factors without increasing overall construction complexity
Solution Approach 2:
The sensor uses composite material structures combining flexible support materials with sensing materials and insulating materials. This composite approach enables the sensor to adapt to complex geometries while maintaining manageable construction through standardized layering techniques
2Reliability
If sensors are made durable to tolerate excessive use, then reliability is improved, but comfort and skin compatibility deteriorate
Solution Approach 1:
The sensor employs flexible support layers and thin film structures that provide durability through mechanical robustness while maintaining softness and flexibility for comfortable skin contact. The flexible substrate absorbs stress during excessive use without transferring harmful forces to the skin
Solution Approach 2:
Composite material construction combines durable sensing materials with soft, biocompatible flexible support materials. This allows the sensor to tolerate excessive use while the flexible outer layers prevent skin discomfort and irritation
3Ease of operation
If sensors integrate seamlessly into clothing or skin, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The sensor merges multiple functional layers into a single integrated flexible device that can be seamlessly incorporated into clothing or worn on skin. The conductive threads are embedded within the layered structure, eliminating the need for separate wiring and simplifying integration
Solution Approach 2:
The multi-layer construction serves multiple functions simultaneously: the flexible support layer provides structural integrity and comfort, the sensing material layer detects pressure, and the insulating layer prevents electrical interference. This multi-functionality is achieved through a standardized design that can be universally applied to various wearable 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
These sensors provide accurate and comfortable static and dynamic body measurements, enabling applications in healthcare, sports, and ergonomics by detecting pressure, bend, and stretch, while being durable and comfortable for long-term use.
Implementation Method 1
Current construction primarily focuses on force sensitive resistors (FSRs), where a material's resistance changes as a function of applied force
Implementation Method 2
using techniques such as electrospinning and spraying for enhanced sensitivity and comfort
Implementation Method 3
using techniques such as electrospinning and spraying for enhanced sensitivity and comfort
Data Source
AI summary
A method of fabricating a sensor for static and dynamic body measurements, comprising providing a first layer serving as a flexible support material; disposing a second layer on the first layer, the second layer serving as a sensing material; disposing a third layer on the second layer, the third layer comprising an insulating material; coupling the second layer and the third layer using a first electrode comprising a first conductive thread and a first non-conductive thread, the first conductive thread embedded in the second layer; and coupling the first layer and the second layer using a second electrode comprising a second conductive thread and a second non-conductive thread, the second conductive thread embedded in the second layer.