Flexible Tactile Sensor for Normal and Shear Force Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing soft force sensors are limited in their ability to simultaneously measure normal and shear forces with high sensitivity and flexibility, particularly in applications requiring precise biomechanical analysis and human-machine interfacing.
Innovation Solution
A tactile sensor design featuring multiple sensing layers with conductive soft polymer materials and electrically conductive strips, arranged in a specific configuration to detect both normal and shear forces, utilizing impedance measuring devices to process the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rigid sensors are used, then measurement precision is improved, but flexibility and comfort are worsened
Solution Approach 1:
The patent employs flexible sensing layers made from soft polymer materials with embedded conductive strips, allowing the sensor to conform to curved surfaces and flex without obstruction while maintaining force sensing capability. The flexible substrate enables the sensor to adapt to wearable applications and complex geometries.
Solution Approach 2:
The sensor combines multiple materials including soft polymers, conductive strips, and insulating layers to create a composite structure that integrates flexibility with sensing functionality. This composite approach allows simultaneous achievement of mechanical compliance and electrical sensing performance.
2Adaptability or versatility
If soft sensors are used, then flexibility is improved, but measurement precision is worsened
Solution Approach 1:
The sensor divides the sensing area into multiple discrete sensing elements arranged in arrays across two or more sensing layers. This segmentation enables independent measurement at multiple locations, improving spatial resolution while maintaining the flexibility of soft materials.
Solution Approach 2:
The patent extends the sensing capability from a single plane to multiple layers stacked in the vertical dimension. By arranging sensing elements in three-dimensional space across multiple layers, the sensor achieves enhanced spatial resolution without compromising flexibility.
3Adaptability or versatility
If previous soft shear sensors are used, then flexibility is improved, but sensitivity is worsened
Solution Approach 1:
The sensor employs dynamic signal processing techniques including impedance measurement and differential signaling to enhance sensitivity. The system actively measures changes in electrical properties in response to mechanical deformation, improving detection capability while maintaining flexibility.
Solution Approach 2:
The sensor incorporates feedback mechanisms through impedance measuring devices that continuously monitor the electrical state of the sensing elements. This feedback enables real-time compensation and enhancement of sensitivity while preserving the flexible nature of the sensor.
4Adaptability or versatility
If sensors measure both normal and shear forces, then versatility is improved, but device complexity is worsened
Solution Approach 1:
The sensor achieves multi-functionality by integrating both normal and shear force sensing capabilities within a unified structure. The same flexible substrate and conductive strip arrangement enable measurement of multiple force components, reducing the need for separate sensor systems.
Solution Approach 2:
The patent combines normal and shear sensing functions into a single integrated sensor assembly. By merging multiple sensing capabilities into one device with shared structural elements, the overall system complexity is managed while maintaining comprehensive sensing functionality.
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 enhanced sensitivity and flexibility, enabling accurate measurement of both normal and shear forces, which is crucial for applications in robotics, wearables, prosthetics, and biomedical fields.
Implementation Method 1
the first conductive soft polymer material has a first intrinsic conductivity, wherein the second conductive soft polymer material has a second intrinsic conductivity
Implementation Method 2
the primary sensing mechanism of the soft sensors is usually based on the mechanical strains observed by the sensing elements
Data Source
AI summary
A tactile sensor including a first insulating layer, a first sensing layer of a first conductive soft polymer material, a second sensing layer of a second conductive soft polymer material and a second insulating layer. The first sensing layer includes first electrically conductive strip located therein and the first sensing layer is positioned above the first insulating layer. The second sensing layer includes second and third electrically conductive strips located therein and the second sensing layer is positioned above the first sensing layer. The second and third electrically conductive strips are arranged within a first plane located within the second sensing layer, separated by the second conductive soft polymer material. The first and second electrically conductive strips are arranged within a second plane transverse to the first plane, separated by the first conductive soft polymer material. The second insulating layer is positioned above the second sensing layer. The first and second electrically conductive strips are connected to a first impedance measuring device. The second and third electrically conductive strips are connected to a second impedance measuring device.