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A Multimodal, Adjustable Sensitivity, Digital 3-Axis Skin Sensor Module.

Alexis Carlos Holgado1, Tito Pradhono Tomo1, Sophon Somlor1

  • 1Department of Modern Mechanical Engineering, School of Creative Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.

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This study enhances a flexible skin sensor module with adjustable sensitivity using Hall effect and capacitive sensing. The improved sensor offers precise force and proximity detection for robotic applications.

Keywords:
adjustable sensitivitycapacitivemagneticmultimodalsensorskintactile

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Area of Science:

  • Robotics
  • Materials Science
  • Sensor Technology

Background:

  • Existing robotic skin sensors often lack adjustable sensitivity and multimodal sensing capabilities.
  • Integration of multiple sensing modalities like force and proximity is crucial for advanced robotic interaction.
  • Previous sensor designs may be bulky, limiting their application on large or complex robotic surfaces.

Purpose of the Study:

  • To present significant improvements to a multimodal, adjustable sensitivity skin sensor module.
  • To integrate geomagnetic Hall effect sensing with capacitive sensing for enhanced functionality.
  • To reduce the size of the sensor module and demonstrate its interconnectivity for large-surface coverage.

Main Methods:

  • Utilized a 3-axis Hall effect sensor to detect magnetic field variations from an adjustable electromagnet.
  • Incorporated capacitive sensing for both pre-touch (proximity) and normal force detection.
  • Designed the sensor module for scalability and interconnection with other modules for comprehensive surface coverage.
  • Implemented adjustable current to the electromagnet for real-time sensitivity tuning.

Main Results:

  • Demonstrated successful integration of Hall effect and capacitive sensing modalities.
  • Achieved significant size reduction compared to previous designs.
  • Presented calibration results and analysis of sensor characteristics, including adjustable sensitivity.
  • Validated the sensor's capability for normal and shear force sensing and object proximity detection.

Conclusions:

  • The enhanced skin sensor module offers improved performance, flexibility, and scalability for robotic applications.
  • The multimodal sensing approach with adjustable sensitivity provides a more versatile and responsive robotic skin.
  • The compact and interconnected design facilitates the development of advanced robotic systems with enhanced environmental awareness.