Stretch Sensor Technology
GummiStra™

伸縮センサー技術

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.

センサーグローブ

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.

センサーグローブ

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.

伸縮センサー

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. In our division, we are investigating the application of this technology to motion detection, such as arm and finger movements when playing a musical instrument.

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 workers’ movements at manufacturing sites
  • Visualization of movement of outdoor workers Application to VR and MR video content
  • Concurrent engineering in the development process for the manufacturing industry

Papers

Journal 

Tomoyuki Kuroiwa, Akimoto Nimura, Yu Takahashi, Toru Sasaki, Takafumi Koyama, Atsushi Okawa, Koji Fujita. “Device Development for Detecting Thumb Opposition Impairment Using Carbon Nanotube-Based Strain Sensors” Sensors 2020, 20(14), 3998.
2020
Tomoyuki Kuroiwa, Akimoto Nimura, Yu Takahashi, Toru Sasaki, Takafumi Koyama, Atsushi Okawa, Koji Fujita. “Device Development for Detecting Thumb Opposition Impairment Using Carbon Nanotube-Based Strain Sensors” Sensors 2020, 20(14), 3998.
2020
Katsunori Suzuki, Koji Yataka, Yasuro Okumiya, Shingo Sakakibara, Keisuke Sako, Hidenori Mimura, Yoku Inoue. “Rapid-response, widely stretchable sensor of aligned MWCNT/elastomer composites for human motion detection.” ACS Sens. 2016, 1, 6, 817–82
2016