Optical Tactile Sensor Structure for Multi-Axial Contact Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tactile sensors provide limited information with low fidelity, are constrained to force-derived feedback, and lack the ability to measure skin deformation with high spatial and temporal resolution, thereby hindering haptic science and touch-based devices.
Innovation Solution
A multi-axial multi-modal optical tactile sensor that mimics the mechanoreceptors in human skin, capturing a wide range of tactile information by integrating sensing cells made of silicone elastomer and conductive materials, capable of detecting multi-axial pressures, temperature, humidity, impact, vibration, and triboelectric effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing tactile sensing mechanisms are used, then device size and power consumption are constrained, but optical sensing mechanisms offer speed and sensitivity advantages
Solution Approach 1:
The patent replaces complex mechanical sensing structures with optical sensing mechanisms. Light-transmitting base material with embedded sensing cells uses optical properties (light transmission differences) to detect tactile stimuli, eliminating the need for complex mechanical components while achieving rapid signal response and high sensitivity.
Solution Approach 2:
The patent changes the detection parameter from mechanical displacement to optical transmission properties. By monitoring changes in light transmission through the base material and sensing cells, the system achieves fast response speeds without requiring complex mechanical measurement systems.
2Loss of information
If existing tactile sensors are used, then they are constrained to force-derived feedback, but the invention captures full range of contact mechanics
Solution Approach 1:
The patent segments the sensing functionality into multiple specialized sensing cells embedded within the base material. Different sensing cells can detect different aspects of contact mechanics (pressure, shear, vibration), allowing comprehensive tactile information capture while keeping each individual sensing element relatively simple.
Solution Approach 2:
The patent creates a multi-functional sensing system where the same base material and sensing cell structure can detect multiple types of tactile stimuli simultaneously (normal force, shear force, vibration, temperature). This universal approach captures the full range of contact mechanics without requiring separate specialized sensors for each modality.
3Device complexity
If imaging-based sensors are used, then additional components like cameras are required, but the invention integrates sensing cells directly in the base material
Solution Approach 1:
The patent merges the sensing cells directly into the base material structure. The sensing cells are embedded within the light-transmitting base material, eliminating the need for separate cameras and external imaging components. This integrated approach simplifies the device while maintaining measurement precision through direct optical interaction with the contact interface.
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 provides comprehensive, human-like tactile feedback with high fidelity by emulating the functionality of different mechanoreceptors, enabling accurate detection of contact mechanics and dynamics.
Implementation Method 1
The sensing block is made of a light-transmitting and elastic base material
Implementation Method 2
capable of detecting multi-axial pressures, temperature, humidity, impact, vibration, and triboelectric effects
Implementation Method 3
capable of detecting multi-axial pressures, temperature, humidity, impact, vibration, and triboelectric effects
Implementation Method 4
capable of detecting multi-axial pressures, temperature, humidity, impact, vibration, and triboelectric effects
Data Source
AI summary
A sensing device comprising an optical tactile sensor that comprises a sensing block is provided. The sensing block is made of a light-transmitting and elastic base material, and comprises a plurality of sensing cells. The sensing device may further comprise an optic fiber, a light sensor, and a calibration cell. A method of making the sensing device is also provided. The optical tactile sensor can provide multi-axial and multi-modal capabilities to practical applications.