Multilayer Strain Mapping Sensor for High-Resolution Contact Detection
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Solution Overview
Problem
Existing strain mapping sensors face limitations such as limited contact point accommodation, non-uniform conductivity leading to measurement uncertainties, susceptibility to leaks, and high hysteresis values affecting signal reliability, especially in large-area applications.
Innovation Solution
A multilayer strain mapping sensor with a stack of three layers, including a compressible middle layer with varying resistance and highly conductive outer layers, uses AC or DC excitation signals to accurately measure strain positions and intensities, accommodating multiple contacts and compensating for resistance changes due to temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If EIT systems use a limited number of electrodes to reduce system complexity, then device complexity is reduced, but the number of contact points that can be accommodated is limited
Solution Approach 1:
The patent transitions from a 2D electrode array on the sensor boundary to a 3D multilayer structure with electrodes distributed across multiple layers. This dimensional change allows simultaneous accommodation of multiple contact points without proportionally increasing electrode count, resolving the contradiction between system complexity and contact point capacity
Solution Approach 2:
The sensor is divided into multiple layers with electrodes strategically positioned on different layers. This segmentation allows the system to detect contact points across multiple dimensions, increasing the number of detectable contacts while maintaining manageable system complexity through modular layer design
2Loss of time
If EIT systems linearize the inverse problem to reduce computation time, then processing speed is improved, but measurement precision deteriorates in areas away from electrodes
Solution Approach 1:
The patent pre-calculates and stores sensitivity matrices for different contact scenarios during system initialization. This preliminary action allows the system to perform rapid look-up and comparison during actual measurements without performing complex real-time inverse problem solving, thus reducing computation time while maintaining precision through pre-computed accurate reference data
3Reliability
If ionic liquid is injected to overcome conductivity non-uniformity, then conductivity uniformity is improved, but the sensor becomes susceptible to leaks
Solution Approach 1:
The patent replaces the problematic ionic liquid injection method with a solid-state conductive polymer layer that provides uniform conductivity without leak risks. This substitution uses a stable, non-fluid material that achieves the same electrical uniformity function without the harmful leakage side effect, effectively eliminating the contradiction
Solution Approach 2:
The conductive polymer layer acts as an intermediary between the electrode and the sensing medium, providing a uniform conductivity interface that eliminates the need for ionic liquid injection. This intermediary layer achieves conductivity uniformity through its inherent material properties rather than fluid injection, preventing leak susceptibility
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 multilayer sensor enables high-resolution strain mapping with improved accuracy and ease of manufacturing, supporting large-area applications by minimizing measurement uncertainties and reducing manufacturing complexity.
Implementation Method 1
The at least three layers can include a first electrically conductive layer. The first electrically conductive layer can be connected to a voltage or current source. The at least three layers can further include a second electrically conductive layer.
Implementation Method 2
A multilayer strain mapping sensor with a stack of three layers, including a compressible middle layer with varying resistance
Data Source
AI summary
Embodiments of the present technology may include a strain mapping sensor. The strain mapping sensor can include a set of electrodes. The strain mapping sensor can further include at least three layers. Each of the at least three layers can be formed a rigid material, a flexible material, or a stretchable material. The at least three layers can include a first electrically conductive layer. The first electrically conductive layer can be connected to a voltage or current source. The at least three layers can further include a second electrically conductive layer. Additionally, the at least three layers can include a third layer. The second electrically conductive layer can have a first surface and a second surface. At least one electrode of the set of electrodes can be positioned on the second surface and electrically coupled with the second electrically conductive layer.