Tactile Sensor Using Variable Pressure-Dependent Materials
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Solution Overview
Problem
Conventional tactile sensors used in medical robots face challenges with low reliability and short longevity due to invariable transformation when subjected to repeated pressure, making them unsuitable for high-performance applications.
Innovation Solution
The development of an apparatus and method utilizing pressure measurement units with materials having variable pressure-dependent properties, such as carbon nanotube-polymer compounds and force-sensitive resistors, to measure external pressure and generate three-dimensional tactile information, enhancing reliability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tactile sensors use metal strain gauges or conductive polymers, then the sensor can measure pressure, but the reliability and longevity are low due to invariable transformation under repeated pressure
Solution Approach 1:
The patent changes the material parameter from invariable (conventional metals and polymers) to variable pressure-dependent properties. The new material's resistance or capacitance changes dynamically with applied pressure, enabling reliable and repeatable signal detection across multiple pressure cycles without degradation.
Solution Approach 2:
The patent employs composite materials with specific pressure-dependent properties (such as carbon nanotube-polymer compounds) that combine the flexibility needed for tactile sensing with the variable electrical properties required for reliable signal detection under repeated pressure application.
2Duration of action of stationary object
If conventional tactile sensors are used, then the sensor can detect pressure, but the longevity is short due to invariable transformation under repeated pressure
Solution Approach 1:
The material's electrical parameters (resistance or capacitance) are designed to change variable with pressure while maintaining stability over time. This enables the sensor to withstand repeated pressure application cycles without degradation, significantly extending operational longevity while maintaining reliable signal detection.
3Adaptability or versatility
If a tactile sensor uses soft and smooth material for skin-like flexibility, then the sensor can be used in medical robots, but conventional materials provide low reliability
Solution Approach 1:
The patent uses composite materials that integrate the mechanical properties of soft, flexible polymers (providing skin-like characteristics) with conductive elements such as carbon nanotubes that exhibit variable electrical properties under pressure. This combination achieves both the required flexibility for medical robot applications and the reliable signal detection necessary for tactile sensing.
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 solution provides a tactile sensor with improved reliability and longevity, capable of accurately measuring pressure changes and detecting tactile information with higher sensitivity and durability compared to conventional sensors.
Implementation Method 1
The plurality of pressure measurement units may measure a resistance of the material, and measure the magnitude of the external pressure, using the resistance measured.
Implementation Method 2
The plurality of pressure measurement units may measure a capacitance of the material, and using the measured capacitance, measure the magnitude of the external pressure.
Data Source
AI summary
An apparatus and method for measuring a tactile information, using a material having variable pressure dependent properties is disclosed. The apparatus for measuring the tactile information may include a plurality of pressure measurement units to measure a magnitude of an external pressure using a material having variable properties, and a tactile information measurement unit to measure a three-dimensional (3D) tactile information based on the external pressure using a location of the plurality of pressure measurement units and a pressure measured by the plurality of pressure measurement units.