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Updated: Mar 22, 2026

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
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Contact Pressure Level Indication Using Stepped Output Tactile Sensors.

Eunsuk Choi1, Onejae Sul2, Juyoung Kim3

  • 1Department of Electronic Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Korea. silver77@hanyang.ac.kr.

Sensors (Basel, Switzerland)
|April 13, 2016
PubMed
Summary

This study introduces a novel diaphragm-type tactile pressure sensor (SOTS) with stepwise output currents for low-pressure detection. The sensor achieves high signal-to-noise ratio and reliability, enabling pressure mapping and shear sensing.

Keywords:
spatially digitized electrodestepped output characteristicstactile sensortactile sensor array

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Area of Science:

  • Materials Science
  • Sensor Technology
  • Mechanical Engineering

Background:

  • Developing tactile sensors for precise low-pressure detection remains a challenge.
  • Existing sensors often rely on material properties sensitive to environmental factors, impacting reliability.
  • There is a need for sensors with high reproducibility and signal-to-noise ratio for accurate tactile feedback.

Purpose of the Study:

  • To report a novel diaphragm-type tactile pressure sensor (SOTS) with stepwise output currents.
  • To demonstrate the sensor's capability for high signal-to-noise ratio detection at low contact pressures.
  • To showcase the SOTS array's potential for pressure mapping and shear sensing.

Main Methods:

  • Designed a stepped output tactile sensor (SOTS) utilizing a suspended diaphragm making contact with a substrate.
  • Leveraged the contact area to control the number of resistive current paths, generating stepwise output currents.
  • Fabricated a 4x4 array of SOTS with a surface bump structure for advanced sensing capabilities.

Main Results:

  • Achieved a high signal-to-noise ratio (>20 dB) in the 3-500 Hz frequency range for contact pressures below 15 kPa.
  • Demonstrated high reproducibility and reliability due to operation independent of material-specific pressure-dependent electrical properties.
  • Successfully implemented shear sensing and surface pressure mapping (1x1 cm²) using a 4x4 SOTS array.

Conclusions:

  • The novel SOTS offers a reliable and reproducible method for detecting low contact pressures with high signal fidelity.
  • The sensor's design overcomes limitations of traditional pressure-sensitive materials.
  • The SOTS array shows promise for advanced tactile sensing applications, including pressure distribution and shear force detection.