Lamination Type Stretch Sensor for Sensitive Deformation Detection
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Solution Overview
Problem
Conventional stretch sensors with two electrodes on opposite sides of an elastic body are not sensitive enough to detect subtle stretching movements due to the need for significant electrode distance reduction to generate a detectable capacitive change.
Innovation Solution
A lamination type stretch sensor with multiple stretchable layers oriented in different directions, featuring a first and second elastic conductive layer separated by an elastic dielectric layer, which increases the change in induced capacitance when stretched, allowing for more sensitive detection of deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two electrodes are placed on opposite sides of an elastic body to form a capacitor, then the sensor can detect stretch deformation through capacitance change, but the sensor lacks sensitivity to detect subtle stretching because significant electrode distance reduction is required to generate a detectable capacitive change
Solution Approach 1:
The sensor is divided into multiple independent conductive layers (first elastic conductive layer and second elastic conductive layer) separated by a dielectric layer. Each layer contains multiple conductive patterns that form individual capacitive elements, which are then combined to achieve high sensitivity without requiring complex single-structure designs
Solution Approach 2:
The invention transitions from a conventional single-plane electrode structure to a multi-layer stacked structure with conductive layers arranged in different spatial dimensions. This three-dimensional arrangement allows capacitance changes to occur through both distance variation and area variation, significantly enhancing detection sensitivity for subtle stretching
2Measurement precision
If multiple elastic layers with different stretching directions are used to increase capacitance change, then sensitivity is improved, but the device structure becomes more complex
Solution Approach 1:
The first and second elastic conductive layers serve multiple functions: they act as electrodes for capacitance formation, provide mechanical flexibility for stretching in different directions, and enable both distance-based and area-based capacitance changes. This multi-functionality reduces the need for additional specialized components
Solution Approach 2:
The sensor employs a composite structure combining elastic conductive materials (for flexibility and conductivity) with an elastic dielectric material (for electrical isolation and mechanical coupling). This composite approach enables the structure to simultaneously achieve electrical functionality and mechanical stretchability in multiple directions
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
Enhances the sensitivity of stretch deformation detection by generating a meaningful change in total coupling capacitance even with small stretching, enabling more precise tracking of body movements.
Implementation Method 1
the dielectric constant (K) of the dielectric material is ranged between 14 and 8000, and dielectric constant (K) of the elastic dielectric layer is ranged between 4.85 and 300
Implementation Method 2
a total initial coupling capacitance is generated between these first coupling sections and the second coupling sections
Data Source
AI summary
A lamination type stretch sensor includes a first elastic insulating layer, a first elastic conductive layer, an elastic dielectric layer, a second elastic conductive layer and a second elastic insulating layer sequentially piled together thereon. The first elastic conductive layer includes a plurality of first coupling sections and a plurality of first connecting sections. The second elastic conductive layer includes a plurality of second coupling sections and a plurality of second connecting sections disposed between the second coupling sections. The elastic dielectric layer is deposited between the first elastic conductive layer and the second elastic conductive layer. When the composite lamination type stretch sensor is stretched, the first elastic conductive layer and the second elastic conductive layer respectively generate displacements along different directions to make the coupling ratio between the first coupling sections and the second coupling sections varies simultaneously to accordingly obtain a corresponding capacity, so as to determine the deformation of the lamination type stretch sensor in accordance with the corresponding capacity.