Capacitive Sensor System for Robotic Tactile Sensing
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Solution Overview
Problem
Current pressure and shear force sensing systems in robotics are slow, complex, and inadequate for accurately handling delicate objects, limiting the ability of robotic 'hands' to grasp and manipulate objects effectively.
Innovation Solution
A capacitive sensor system with a deformable layer and conductive patches arranged in various orientations, which changes capacitance based on pressure and shear forces, allowing for precise detection of touch, pressure, and shear forces, enabling faster and more accurate robotic grip applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pressure sensing systems are used in robotic hands, then pressure detection capability is provided, but the system becomes slow, complicated, and expensive
Solution Approach 1:
The patent replaces traditional mechanical pressure sensing systems with a capacitive sensing system. The capacitive sensor uses electrical fields and capacitance measurements instead of mechanical components to detect pressure and shear forces, thereby reducing mechanical complexity while maintaining measurement precision.
Solution Approach 2:
The capacitive sensor array serves multiple functions simultaneously: it detects both normal pressure forces and shear forces, provides spatial distribution of forces across the contact surface, and enables fast response for dynamic grasp control, replacing multiple separate sensing systems.
2Measurement precision
If traditional pressure sensing systems are used, then pressure detection is provided, but the response speed is slow
Solution Approach 1:
The patent replaces slow mechanical pressure sensing with fast capacitive sensing. Capacitive measurements can be taken at high frequencies, enabling the robotic hand to detect and respond to force changes in real-time during dynamic manipulation tasks.
3Ease of manufacture
If simple touchpad capacitance sensing is used, then cost is reduced, but the ability to detect nuanced forces for robotic grasp is inadequate
Solution Approach 1:
The patent divides the contact surface into an array of multiple capacitive sensor elements. This segmentation allows independent measurement of pressure and shear forces at different locations, providing the nuanced force distribution information needed for delicate robotic grasp while keeping each individual sensor element simple and inexpensive.
Solution Approach 2:
The patent adds a spatial dimension to force sensing by arranging capacitive sensors in a two-dimensional array. This enables detection of force distribution across the contact surface, not just total force magnitude, providing the nuanced information required for sophisticated robotic manipulation.
4Productivity
If fast multi-touch capacitive sensing is implemented, then response speed and accuracy are improved, but sensor and system complexity increases
Solution Approach 1:
The capacitive sensor array performs multiple sensing functions (pressure, shear force, contact location) using a single integrated system architecture, avoiding the need for separate sensor systems and reducing overall complexity despite the enhanced capabilities.
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 robots to handle objects with greater speed and accuracy, including delicate ones, by providing nuanced force feedback and enabling tactile sensing similar to human grasp, enhancing robotic manipulation and interaction capabilities.
Implementation Method 1
a capacitive sensor system with a deformable layer and conductive patches arranged in various orientations, which changes capacitance based on pressure and shear forces
Data Source
AI summary
A sensor for sensing contact with an outside object is disclosed. A sensor stackup has top surface, having an outer skin adapted for contact with the outside object. The stackup also including, a deformable layer below top surface in the stackup, the deformable layer including patches made from conductive or high dielectric material. The stackup further including a capacitive sensor layer below the deformable layer, the capacitive sensor layer comprising conductors that are insulated from the patches. Each of the patches is displaceable with respect to the capacitive sensor layer in response contact with the outside object. The stackup also includes a backing layer below the capacitive sensor layer in the stackup. The sensor further includes capacitive sensor circuitry operatively connected to the capacitive sensor layer, the capacitive sensor circuitry configured to detect changes in capacitive coupling between the conductors of the capacitive sensor layer resulting from displacement of the patches with respect to the capacitive sensor layer.