Tactile Sensor with Total Reflection Layer for Multi-Directional Force Sensing
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Solution Overview
Problem
Conventional optical tactile sensors are limited in accurately recognizing forces in multiple directions, have a narrow color change range, require significant physical transformation, and are slow in response and recovery, making them unsuitable for precise and multi-directional force sensing applications.
Innovation Solution
A tactile sensor design incorporating a total reflection layer, a pixel layer with a microarray of upconverting nanocrystals, quantum dots, or fluorescence dyes, and a tactile pad layer with interlocking structures, capable of sensing multi-directional forces through color changes and efficient light reflection, allowing for high sensitivity and real-time operation without the need for electrical power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical tactile sensor is used, then the sensor can detect tactile information, but it can only sense two-dimensional tactile sense and cannot accurately recognize forces in various directions
Solution Approach 1:
The patent transitions from 2D optical sensing to 3D tactile sensing by introducing a micro-lens array that focuses light from different spatial directions onto corresponding photodetector elements. This dimensional transformation enables the sensor to capture force information in three-dimensional space, resolving the limitation of conventional 2D optical tactile sensors
2Speed
If an optical tactile sensor is used, then the sensor can detect tactile information, but it has a slow response speed and recovery speed
Solution Approach 1:
The patent replaces mechanical contact-based sensing with optical field-based sensing using a micro-lens array and photodetector system. This substitution eliminates mechanical inertia and contact wear, enabling fast response speeds while maintaining sensing accuracy through optical field interactions
3Measurement precision
If an optical tactile sensor is used, then the sensor can detect tactile information, but it requires a relatively large physical transformation
Solution Approach 1:
The patent changes the detection parameter from large-scale mechanical displacement to optical path length variations. The micro-lens array converts subtle force-induced physical transformations into measurable optical signal changes, enabling high sensitivity detection with minimal physical transformation requirements
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 tactile sensor achieves high sensitivity and multi-directional force recognition, enabling accurate sensing of minute pressures, shear forces, and bends with fast reaction times, and is durable and resilient, suitable for applications like biometric security and medical devices.
Implementation Method 1
a total reflection layer; a pixel layer formed on the total reflection layer and including a microarray
Implementation Method 2
at least one color includes at least one color conversion mediator selected from among a upconverting nanocrystal (UCN) particle, a quantum dot, and a fluorescence dye
Data Source
AI summary
Provided are a tactile sensor, a method of manufacturing the tactile sensor, and a three-dimensional (3D) mapping method. The tactile sensor includes a total reflection layer; a pixel layer formed on the total reflection layer and including a microarray; and a tactile pad layer formed on the pixel layer.