Stretchable Capacitance Sensor for High-Resolution ECVT Imaging
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Solution Overview
Problem
The limitation on the minimum size of sensor plates in Electrical Capacitance Volume Tomography (ECVT) systems restricts the number of plates that can be used, hindering high-resolution imaging due to signal-to-noise ratio and area constraints, while traditional sensor designs suffer from fringing effects and sensitivity hotspots.
Innovation Solution
The development of flexible, wearable, and modular capacitance sensors with reconfigurable synthetic plates and convex shapes that can stretch in three dimensions, integrating all components into a single element with geometry-sensing capabilities, allowing for adaptable imaging of various geometries and reducing fringing effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sensor plates is increased to acquire more capacitance data, then the imaging resolution is improved, but the area of each sensor plate decreases below the minimum required area
Solution Approach 1:
The sensor plate is divided into multiple smaller constitutive segments that can be independently controlled. These segments are electrically connected through a multiplexer to function as a single virtual sensor plate with the required area, while physically being smaller to fit around the object. The segmentation allows the system to achieve high-resolution imaging with multiple plates while maintaining adequate signal area for each active sensing region.
Solution Approach 2:
The sensor plate configuration is made dynamic and reconfigurable. The multiplexer allows different combinations of constitutive segments to be activated as sensor plates depending on the imaging requirements and object geometry. This dynamic reconfiguration enables the system to adapt the effective sensor plate area and arrangement to optimize both resolution and signal quality for different applications.
2Ease of manufacture
If traditional sensor plates are used, then the manufacturing is simple, but fringing effects and sensitivity hotspots reduce imaging quality
Solution Approach 1:
The constitutive segments are designed with curved or convex surfaces rather than flat plates. This curvature distributes the electric field more uniformly across the sensor surface, reducing fringing effects at the edges and eliminating sensitivity hotspots. The convex geometry allows the sensor to conform to curved surfaces while maintaining uniform electric field distribution, thereby improving imaging quality without complicating the manufacturing process.
3Stability of the object's composition
If rigid sensor plates are used, then the structural stability is good, but the sensor cannot adapt to different geometries and sizes
Solution Approach 1:
The sensor plates are constructed using flexible materials that can bend and conform to different geometries while maintaining electrical connectivity and structural integrity. The flexible substrate allows the sensor to adapt to various object shapes and sizes, enabling universal application across different imaging scenarios. The flexible construction maintains sufficient structural stability to support the conductive elements and electrical connections while allowing geometric adaptation.
4Reliability
If the minimum sensor plate area is enforced, then the signal-to-noise ratio is sufficient, but the maximum number of plates is limited
Solution Approach 1:
Each virtual sensor plate is constructed from multiple smaller constitutive segments that physically fit around the object. The segments are electrically connected through a multiplexer to function as a single sensor plate with sufficient area for adequate signal-to-noise ratio. This segmentation enables the system to use many more plates around the object circumference than would be possible with single large plates, increasing the total number of sensing elements while maintaining adequate signal quality for each active region.
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
Enables high-resolution 3D imaging with increased sensitivity and flexibility, allowing the same sensor to be used across different applications and geometries, while minimizing fringing effects and improving image quality by dynamically adjusting to changing geometries.
Implementation Method 1
ECVT is based on recording changes in capacitance measurements induced by changes in dielectric distribution
Implementation Method 2
Electrical capacitance sensors are used for non-invasive imaging by distributing the electric field inside the imaging domain in 3D
Data Source
AI summary
A stretchable capacitance sensor having multiple components for communicating signals to a data acquisition system for reconstructing an image of an area or object located in a subject being sensed, and for calculating the shape or conformity that it is in. The stretchable sensor consists of an inner layer of plates that provide the capacitance data, a middle layer of plates that provide the geometry-sensing data, and an outer layer of plates that serves as the shielding ground layer. The configuration of all three components can be variably changed to increase the capacitance data channels, increase or decrease flexibility and stretchability of the sensor, and increase the spatial resolution of the geometry sensing feature. The sensor is adapted to communicate signals to a data acquisition system for providing an image of the area or object between the capacitance plates.