Triboelectric Grid Sensor for Continuous 2D Trajectory Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tactile sensors face challenges in detecting continuous 2D trajectories and achieving three-dimensional motion control, as they often require complex circuits and struggle with increased resolution and signal interference, limiting their application in robotics and unmanned vehicle control.
Innovation Solution
A triboelectric sensor with a grid structure and multiple electrode pairs that generate a time-varying voltage signal upon object motion, allowing for accurate measurement of continuous motion and independent inference of motion parameters from electric potential ratios, enabling 2D and 3D motion control without external power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sensing units and electrode terminals is increased to achieve higher resolution and more targets for location, then measurement precision is improved, but device complexity and difficulty in electrode signal extraction increase
Solution Approach 1:
The sensor surface is divided into multiple sensing units arranged in an array, with each unit containing a subset of electrode terminals. This segmentation allows the system to achieve high resolution through multiple localized sensing points while managing overall device complexity by organizing electrodes into modular units rather than requiring all electrodes to be independently connected to external circuits simultaneously.
2Measurement precision
If the number of sensing units and electrode terminals is increased to achieve higher resolution, then measurement precision is improved, but signal interference increases
Solution Approach 1:
By dividing the sensor into multiple independent sensing units with localized electrode subsets, the patent reduces signal interference between electrodes. Each sensing unit processes signals independently, preventing cross-talk and interference that would occur in a fully interconnected electrode array, thus maintaining high resolution while minimizing harmful electromagnetic interference.
Solution Approach 2:
The patent introduces intermediate signal processing stages within each sensing unit, including charge collection electrodes, intermediate electrodes, and floating electrodes that act as mediators. These intermediary elements process and isolate signals locally before external readout, reducing direct interference between distant electrode terminals while maintaining high spatial resolution across the entire sensor array.
3Device complexity
If a simplified tactile sensor configuration with two pairs of electrodes is used to reduce complexity, then device complexity is reduced, but the ability to detect continuous 2D trajectories is lost
Solution Approach 1:
The patent divides the sensor into multiple sensing units arranged in an array, where each unit contains a simplified two-pair electrode configuration. While each individual unit uses only two pairs of electrodes for localized touch detection, the collective array of multiple units enables continuous 2D trajectory detection by tracking which units are activated and their spatial relationships, thus achieving both simplicity and versatility.
Solution Approach 2:
The patent transitions from detecting only single-point contact with two pairs of electrodes to detecting continuous 2D trajectories by adding the spatial dimension of multiple sensing units arranged in an array. The system determines trajectory by tracking the sequence and spatial distribution of activations across different sensing units, effectively using the array configuration to encode positional information without requiring complex electrode connections within each unit.
4Measurement precision
If existing tactile sensors are used for motion detection, then measurement capability is provided, but external power sources and complex circuits are required
Solution Approach 1:
The patent implements self-powered sensing units where the mechanical motion being detected directly generates the electrical signals needed for detection. Each sensing unit functions as a self-powered triboelectric nanogenerator that converts mechanical energy from object motion into electrical energy, eliminating the need for external power sources and complex circuitry while maintaining motion detection capability.
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 triboelectric sensor effectively detects continuous motion and infers motion parameters, simplifying readout circuits and enabling 2D and 3D control, enhancing applications in robotics and unmanned vehicle control with reduced complexity and interference.
Implementation Method 1
A TENG is an energy harvesting device that converts external mechanical energy into electricity by a combination of the triboelectric effect and electrostatic induction. In a TENG, a potential is created by the triboelectric effect due to the charge transfer between two materials that exhibit opposite tribo-polarity.
Implementation Method 2
A TENG is an energy harvesting device that converts external mechanical energy into electricity by a combination of the triboelectric effect and electrostatic induction.
Data Source
AI summary
A triboelectric sensor comprises a substrate; at least one grid structure disposed in or on the substrate; and at least one electrode for collecting triboelectric charges that are generated by sliding of an object over a surface of the substrate; wherein the at least one grid structure is configured such that motion of the object is detectable from a signal generated by crossing of the object over at least part of the grid structure.