Electroactive Polymer Capacitor With Corrugated Ridges
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Solution Overview
Problem
Existing pressure sensors lack sensitivity and responsiveness to changes in pressure, particularly in applications requiring low-profile, flexible, and wearable designs.
Innovation Solution
A pressure sensor design featuring a multilayered capacitor with staggered, opposing ridges on its top and bottom surfaces that corrugate and increase surface area when a force is applied, enhancing capacitance measurement and pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional flat capacitor structure is used, then the device complexity is low, but the measurement precision and sensitivity to pressure changes are insufficient
Solution Approach 1:
The capacitor structure is segmented into multiple ridges and grooves rather than a single flat surface. The first set of ridges on the first side and second set of ridges on the second side create multiple grooves that segment the capacitor into distinct regions, allowing differential deformation under pressure to enhance measurement sensitivity.
Solution Approach 2:
The capacitor structure transitions from a two-dimensional flat surface to a three-dimensional corrugated surface with ridges and grooves. This dimensional change allows the capacitor to deform in multiple directions when pressure is applied, increasing the surface area change and thereby improving measurement precision without proportionally increasing device complexity.
2Measurement precision
If the capacitor surface area is increased to improve sensitivity, then the measurement precision improves, but the device occupies more space and becomes less suitable for wearable applications
Solution Approach 1:
The ridges and grooves are nested within the capacitor structure itself, with the first set of ridges on the first side and second set of ridges on the second side creating a compact corrugated pattern. This nesting allows the capacitor to achieve increased effective surface area through vertical deformation rather than horizontal expansion, maintaining a small footprint suitable for wearable applications.
Solution Approach 2:
The capacitor structure is designed to be dynamic rather than static, with the ridges and grooves allowing the capacitor to change its configuration in response to applied pressure. The electroactive polymer material enables the capacitor to dynamically deform and recover, providing sensitive pressure measurement while maintaining a compact form factor when not under load.
3Stability of the object's composition
If rigid structures are used to maintain capacitor integrity, then the structural stability is high, but the sensor cannot conform to various surfaces and is unsuitable for wearable applications
Solution Approach 1:
The capacitor is constructed using flexible electroactive polymer material that can conform to various surfaces while maintaining its structural integrity. The flexible nature of the polymer allows the capacitor to adapt to different geometries in wearable applications, such as embedding in socks, shoes, or grips, while the ridge and groove structure maintains electrical integrity during deformation.
Solution Approach 2:
The capacitor utilizes composite material construction with electroactive polymer layers and conductive elements integrated together. This composite structure provides both the flexibility needed for surface conformability and the electrical integrity required for stable capacitor function, resolving the contradiction between structural stability and adaptability.
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 sensor achieves at least a 50% improvement in output sensitivity and responsiveness, making it suitable for wearable applications such as embedded use in socks, shoes, and grips, with a flexible construction that conforms to various surfaces.
Implementation Method 1
when a force is applied to the capacitor, the force increases a surface area of the capacitor by corrugating the capacitor along the first set of ridges and the second set of ridges
Implementation Method 2
Pressure sensors can act as transducers that generate an electrical signal as a function of the pressure imposed
Data Source
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AI summary
An example pressure sensor is described. The pressure sensor (200) includes a capacitor (202), a first of ridges formed on a first side of the capacitor, and a second set of ridges formed on a second side of the capacitor. The first set of ridges (204) extends outward from the first side of the capacitor and defines a plurality of grooves. The second set of ridges (206) extends outward from the second side of the capacitor. Ridges of the second set of ridges are aligned with grooves of the plurality of grooves such that, when a force is applied to the capacitor, the force increases a surface area of the capacitor by corrugating the capacitor along the first set of ridges and the second set of ridges.