Stretch Sensor Elastic Dielectric Layer Sensitivity
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Solution Overview
Problem
Current stretch sensors with elastic dielectric layers made from rubber have a low dielectric constant, limiting their sensitivity in detecting stretching, and material modifications to increase this constant significantly raise manufacturing costs.
Innovation Solution
Incorporating dielectric materials like Sr1-xCaxTiO3, Sr1-yBayTiO3, or BaTiO3 compounds into the elastic dielectric layer to adjust and enhance the dielectric constant, allowing for a range of 4.85-408.31 F/m, thereby increasing capacitance and sensitivity while controlling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elastic resin is used as the elastic dielectric layer, then the sensor achieves flexibility and elasticity, but the dielectric constant remains low (K value of 2-3), limiting the capacitance and detection sensitivity
Solution Approach 1:
The patent combines elastic resin with high dielectric constant particles (such as barium titanate, lead zirconate titanate, or strontium titanate) to create a composite dielectric layer. This composite structure maintains the flexibility and elasticity of the elastic resin while incorporating particles with dielectric constants ranging from 100 to 10,000, thereby significantly increasing the overall capacitance and detection sensitivity of the stretch sensor.
2Measurement precision
If material modification is applied to the elastic resin to enhance its polarized ability and increase the dielectric constant, then the capacitance improves, but the manufacturing cost increases significantly
Solution Approach 1:
Instead of modifying the elastic resin itself through complex chemical processes, the patent uses a composite approach where inexpensive elastic resin is combined with relatively low-cost high dielectric constant particles. This physical combination achieves high capacitance (improving measurement precision) while avoiding the significant manufacturing cost increases associated with material modification, as the particles can be simply dispersed and embedded in the elastic resin matrix.
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 solution effectively increases the sensitivity of stretch sensors by adjusting the dielectric constant of the elastic dielectric layer, enhancing capacitance and reducing manufacturing costs compared to traditional rubber-based sensors.
Implementation Method 1
an induced capacitor having the electrodes is formed across the elastic dielectric layer. In the case that the elastic dielectric layer is stretched so as to reduce the spacing between the electrode, then the capacitance of induction capacitor would be varied
Implementation Method 2
the dielectric material being composed by at least one of an Sr1-xCaxTiO3 compound, an Sr1-yBayTiO3 compound and a BaTiO3 compound with 0.1≤x≤0.9 and 0.1≤y≤0.9, so as to have a dielectric constant (K value) of the dielectric material within 5.65-2087.3 F/m
Data Source
AI summary
A 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 and the second elastic insulating layers include the same elastic resin, and the first and the second elastic conductive layer include the same elastic resin and the same conductive material. The elastic dielectric layer includes the elastic resin and a dielectric material, in which the dielectric material comprises at least one of an Sr1-xCaxTiO3 compound, an Sr1-yBayTiO3 compound, and a BaTiO3 compound so as to make the dielectric constant of the dielectric material within 15.65-2087.3 F/m.