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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
561

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Updated: Nov 14, 2025

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Flexible Noncontact Sensing for Human-Machine Interaction.

Lijun Lu1, Chunpeng Jiang1, Guosheng Hu1

  • 1National Key Laboratory of Science and Technology on Micro/Nano Fabrication, Department of Micro/Nano Electronics, Shanghai Jiao Tong University, Shanghai, 200240, China.

Advanced Materials (Deerfield Beach, Fla.)
|March 8, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a noncontact humidity sensor using graphene and polyamide nanofibers. This flexible sensor enables real-time respiration monitoring for asthma detection and touchless control systems, enhancing human-machine interaction safety.

Keywords:
flexible deviceshumidity sensinghydrogen bondsnoncontact human-machine interactionpolymers

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Area of Science:

  • Materials Science and Engineering
  • Biomedical Engineering
  • Sensor Technology

Background:

  • Traditional human-machine interaction (HMI) relies on contact sensors, posing risks of mechanical wear and pathogen transmission, particularly highlighted during the COVID-19 pandemic.
  • The need for noncontact HMI is critical for remote applications, touchless control, and infection prevention in various fields, including healthcare and robotics.

Purpose of the Study:

  • To develop a flexible, high-sensitivity humidity sensor array for noncontact human-machine interaction.
  • To demonstrate the sensor's application in real-time respiration rate monitoring for asthma detection and remote alarm systems.
  • To provide touchless interfaces for applications such as medicine delivery to bedridden patients.

Main Methods:

  • Fabrication of a flexible sensor by anchoring multilayer graphene (MG) into electrospun polyamide (PA) 66 nanofiber networks.
  • Utilizing the synergistic effects of the large specific surface area and abundant water-absorbing functional groups of the PA66 nanofibers for high sensor performance.
  • Implementing the sensor in noncontact mode for monitoring physiological signals like respiration rate.

Main Results:

  • Successful development of a flexible, high-sensitivity humidity sensor and array.
  • Demonstrated noncontact operation for real-time respiration rate monitoring, crucial for asthma detection.
  • Validation of the sensor's potential for touchless interfaces in medical applications and remote alarm systems.

Conclusions:

  • The developed sensor offers a novel approach to noncontact HMI, mitigating risks of contagiousness and mechanical wear.
  • The combination of graphene and polyamide 66 nanofibers provides an effective strategy for high-performance smart electronic devices.
  • This technology paves the way for a new generation of safe and efficient noncontact interaction systems in diverse fields.