Elastic Curved Plate Capacitor for Distance Measurement
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Solution Overview
Problem
Conventional plate capacitors with rigid plates are limited in their use for travel measurements due to the minimal change in capacitance as the distance between the plates increases, which affects measurement accuracy.
Innovation Solution
A plate capacitor with a first elastic, conductive capacitor plate of curved shape, held by a holder, and an electrically insulating layer between the plates, allowing only a punctiform or linear contact, which influences capacitance and enables accurate distance measurements by increasing the effective surface area as the plates deform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rigid capacitor plates are used, then the structure is simple and stable, but the measurement precision deteriorates because capacitance changes minimally with distance
Solution Approach 1:
The first capacitor plate is designed with a curved surface (spherical or cylindrical segment) instead of a flat rigid plate. This curvature allows the plate to deform elastically in response to pressure or distance changes, significantly increasing capacitance variation and thereby improving measurement precision.
Solution Approach 2:
The capacitor plate's physical state is changed from rigid to elastic, allowing dynamic deformation. This parameter change enables the plate to adapt its shape in response to external forces, creating a more sensitive measurement system that translates small distance changes into larger capacitance variations.
2Measurement precision
If the capacitor plates are positioned far apart, then the device complexity is reduced, but the measurement precision deteriorates due to minimal capacitance change
Solution Approach 1:
The curved surface of the first capacitor plate creates a non-uniform gap distribution when positioned relative to the second plate. This geometry amplifies capacitance changes for small distance variations, improving measurement sensitivity without requiring the plates to be in close proximity.
Solution Approach 2:
By using an elastic material, the plate's shape parameter can dynamically change in response to external pressure or distance changes. This allows the system to maintain high sensitivity across a range of operating distances, effectively decoupling measurement precision from fixed plate spacing.
3Measurement precision
If a large surface area of the first capacitor plate contacts the second capacitor plate, then the device complexity is reduced, but the measurement precision deteriorates because air as dielectric has less influence
Solution Approach 1:
The curved surface ensures that only a small punctiform or linear region contacts the second capacitor plate, while other regions maintain larger gaps. This geometry maximizes the volume of air dielectric in the capacitance-forming region, enhancing measurement sensitivity and precision.
Solution Approach 2:
The curved capacitor plate creates non-uniform local gaps between the plates. The contact region has zero gap while other regions have varying gaps, creating a distributed capacitance structure where air dielectric plays a significant role in the overall capacitance, thereby improving measurement accuracy.
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
This configuration provides reproducible and accurate measurement results, especially for distance and pressure measurements, by linearly dependent capacitance changes with distance reduction, ensuring precise measurement values.
Implementation Method 1
The first capacitor plate 100 is produced from an elastic material, has a curved shape in the unloaded state
Implementation Method 2
by way of the change in the capacitance of the plate capacitor as the distance of the capacitor plates from one another changes being used, by way of measuring the capacitance of the plate capacitors, to draw conclusions about the distance of the capacitor plates from one another
Data Source
AI summary
A plate capacitor having a first capacitor plate which is arranged at a distance from a second capacitor plate. The first capacitor plate is produced from an elastic material and has a curved shape in the unloaded state. The first capacitor plate is held by a holder. The elastic material to be is electrically conductive or is provided with an electrically conductive layer. An electrically insulating layer is arranged between the first and the second capacitor plate.