Sensor Element With Mechanically Coupled Cells for Shear Force Sensing
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Solution Overview
Problem
Current robotic skin technologies face challenges in accurately sensing forces and pressures, particularly in detecting shear forces and simulating human-like tactile perception, due to limitations in existing direct force sensors, deformation sensors, and piezo-sensors.
Innovation Solution
A sensor element with mechanically coupled sub-cells and pressure sensor elements, where each sub-cell has a sealed inner volume fluidically coupled to a pressure sensor, allowing for high-performance multidirectional sensing by evaluating forces and pressures across adjacent cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct force sensors are used, then force sensing capability is provided, but shear force sensitivity is lost
Solution Approach 1:
The sensor element is divided into multiple sensor cells (first sensor cell, second sensor cell, etc.) that are mechanically coupled through flexible walls. Each cell independently senses force in its local region, and the combination of readings from multiple cells enables detection of both normal and shear forces through differential measurement
Solution Approach 2:
Each sensor cell is designed with specific local properties (sealed inner volume, flexible boundaries) that enable it to respond to local deformations. The mechanical coupling through flexible walls creates local interactions that propagate force information across adjacent cells, enabling shear force detection while maintaining normal force sensing capability
2Measurement precision
If high spatial sensing resolution is implemented, then object recognition capability is improved, but device complexity increases
Solution Approach 1:
The sensor surface is segmented into multiple discrete sensor cells arranged in a grid or array pattern. This segmentation provides high spatial resolution by allowing independent measurement at each cell location, while the modular structure keeps individual cell complexity low and enables systematic scaling
Solution Approach 2:
Multiple sensor cells are mechanically coupled through shared flexible walls to form an integrated sensor element. This merging allows the system to achieve high spatial resolution through the array of cells while maintaining manageable complexity through the unified mechanical coupling and centralized pressure sensor
3Adaptability or versatility
If multiple pressure sensor elements are used, then multidirectional sensing capability is improved, but power consumption increases
Solution Approach 1:
Multiple pressure sensor elements are integrated into a single sensor element with mechanically coupled sensor cells. The flexible walls transmit mechanical deformations from multiple directions to the pressure sensors, enabling multidirectional sensing while the sensors operate in a coordinated manner to reduce overall power consumption compared to independent sensing systems
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 precise estimation of force magnitude and direction, enhancing robotic tactile sensing capabilities and reducing power consumption, suitable for robotic applications and other touch-sensitive devices.
Implementation Method 1
Each sealed inner volume is fluidically coupled to at least one of the at least one pressure sensor elements
Implementation Method 2
Two adjacent sensor cells may be mechanically coupled via the flexible wall separating the two adjacent sensor cells
Implementation Method 3
The flexible cell housing comprises a flexible outer cover and flexible cell boundaries, e.g. walls, between adjacent sensor cells
Data Source
AI summary
In accordance with an embodiment, a sensor element includes: a plurality of mechanically coupled sensor cells, each of the plurality of mechanically coupled sensor cells having a sealed inner volume within an at least partially flexible cell housing, wherein the flexible cell housing comprises a flexible outer cover and flexible cell boundaries between adjacent sensor cells; and at least one pressure sensor element, wherein each sealed inner volume of the mechanically coupled sensor cells is fluidically coupled to at least one of the at least one pressure sensor element.