Dual-Resolution Tactile Sensor Array for Humanoid Robots
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Solution Overview
Problem
Current robotics technologies lack efficient methods for detecting pressure intensities and patterns on surfaces, particularly for humanoid robots, as existing tactile sensing systems do not seamlessly integrate with the outside world and provide adequate resolution for both coarse and fine tactile interactions.
Innovation Solution
A sensor array system comprising coarse and fine tactile sensors, where coarse sensors encompass or overlap fine sensors, both mounted on circuit boards and covered by a flexible artificial skin, allowing for enhanced pressure detection and environmental protection, with processor circuits to collect and analyze sensor data for improved tactile feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only fine tactile sensors are used, then measurement precision is improved, but device complexity and power consumption increase
Solution Approach 1:
The tactile sensor array is segmented into multiple resolution levels: coarse sensors with large sensitive areas for low-resolution detection, and fine sensors with smaller sensitive areas for high-resolution detection. This segmentation allows the system to achieve high measurement precision where needed while reducing overall device complexity by using simpler coarse sensors for broader coverage areas.
Solution Approach 2:
Different regions of the tactile sensor array have different sensor densities and resolutions. Fine sensors are concentrated in specific local areas where high precision is required, while other areas use coarse sensors. This local differentiation optimizes measurement precision in critical zones without unnecessarily increasing device complexity across the entire array.
2Loss of information
If all sensors are continuously sampled, then information completeness is improved, but power consumption and bandwidth requirements increase
Solution Approach 1:
The system implements periodic sampling with variable frequency based on sensor type and activation state. Coarse sensors are sampled at lower frequencies or only triggered when activation is detected, while fine sensors are sampled at higher frequencies only when needed. This periodic action with adaptive frequency maintains information completeness while significantly reducing power consumption and bandwidth requirements compared to continuous sampling of all sensors.
Solution Approach 2:
Coarse sensors act as self-service triggers that automatically activate fine sensors only when tactile contact is detected in their coverage area. This self-service mechanism ensures that fine sensors (which consume more power) are only activated when necessary, maintaining information completeness while reducing overall power consumption and bandwidth usage.
3Area of stationary object
If coarse sensors have large sensitive areas, then coverage area is improved, but measurement precision deteriorates
Solution Approach 1:
The sensor array is segmented into coarse sensors with large sensitive areas for broad coverage and fine sensors with smaller sensitive areas for high precision. Each sensor type serves its specific resolution level, allowing the system to achieve both large coverage areas and high measurement precision in different regions simultaneously.
Solution Approach 2:
Different areas of the tactile array have different sensor resolutions matched to their functional requirements. Areas requiring high precision use fine sensors with smaller sensitive areas, while areas requiring broad coverage use coarse sensors with larger sensitive areas. This local quality differentiation resolves the contradiction between coverage area and measurement precision.
4Adaptability or versatility
If multiple resolution levels are implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The tactile sensor array is segmented into distinct coarse and fine sensor layers, each optimized for specific resolution levels. This segmentation provides adaptability by allowing the system to select appropriate resolution levels for different tactile interaction scenarios, while the modular segmented structure actually simplifies the overall device complexity compared to a uniform high-resolution array.
Solution Approach 2:
The multi-resolution sensor array provides universal tactile sensing capability that can adapt to various interaction scenarios. The same sensor array structure serves multiple functions: broad coverage detection using coarse sensors and detailed localized detection using fine sensors, eliminating the need for multiple separate sensor systems and reducing overall device complexity.
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
This system enables more accurate and seamless interaction with the environment by providing dual-resolution tactile sensing, enhancing the ability of humanoid robots to perceive and respond to pressure, while reducing power and bandwidth requirements by only sampling sensors when necessary.
Implementation Method 1
A first sensor of a set of sensors arrayed on a face of a printed circuit board may be any type of tactile, force or pressure sensor, such as a force sensing resistor (FSR) sensor
Data Source
AI summary
Tactile sensing using both coarse and fine tactile sensors. A coarse tactile sensor having a first sensitive area at least partially encompasses or overlies a plurality of fine tactile sensors, each having a respective sensitive area smaller than the first sensitive area. The coarse tactile sensor(s) and fine tactile sensors may be carried on a same circuit board or separate circuit boards. Processor(s) circuits are communicatively coupled to the coarse and/or fine tactile sensors. Information indicative of at least a presence or absence of force or pressure at a given location monitored by the respective tactile sensor, and/or a measure of the force or pressure or strain is collected. Such may be mounted to a backing, and optionally covered or encased in an artificial skin. Collecting sensor readings employs both coarse and fine tactile sensors, sampling corresponding fine tactile sensors in response to detection by a coarse tactile sensor.