Stretch Sensor Technology

Rubber-like Stretchable Strain Sensors

We have been developing “GummiStra”, thin-film-based rubber-like stretchable strain sensors. This technology is used as a component of a textile-based wearable sensing system to detect human motion in real time. GummiStra detects small to large strain (displacement) by sensing changes in resistance. It can precisely detect fine finger motions and muscle movements, and collect strain data, when worn on body surfaces.

Detect Fine Human Motions

With excellent wearability and an affinity for human skin, GummiStra can be used to accurately measure the slightest human movement, such as the bending of joints and movement of muscles. It can be pasted directly on body surfaces. Through joint development with various customers, we can realize unique wearable systems.

Resistive Change Type Strain Sensor Capable of Detecting Small to Large Displacements

GummiStra can measure small to large strain (up to double length) with only a single device. It is not only capable of statically and dynamically detecting small to large strains, but is also thin, lightweight, and easily formed into various shapes. The detection principle of the sensor is resistance change, so it does not require special circuitry. Also, multi-channel systemization can be easily realized.

Sweat and Water Resistant

GummiStra is resistant to sweat and water, and can be used outdoors and while exercising.

How it Works

GummiStra consists of an aligned carbon nanotube sheet that is covered and combined with a special urethane elastomer resin layer. The resistance at both ends increases linearly in response to strain. The detection limit is over 200% (up to double length) strain.

Future Plans

We aim to apply this system to the detection of human motion, which is difficult to detect with optical motion capture systems.

  • Visualization of performance: digitization of arm and finger movements while playing a musical instrument
  • Enable detection of body movements and muscle movements in each part of the body through sensing systemization,
    so that it can be used in the field where it is difficult to use optical systems.
  • Visualization of workers on the manufacturing factory
  • Expansion to outdoor works, sports, and rehabilitation
  • Concurrent engineering in the development process for the manufacturing