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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...
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Multifunctional Woven Structure Operating as Triboelectric Energy Harvester, Capacitive Tactile Sensor Array, and

Kihong Kim1, Giyoung Song2, Cheolmin Park3

  • 1Department of Electronic Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Korea. ekdrmsking@sogang.ac.kr.

Sensors (Basel, Switzerland)
|November 10, 2017
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Summary

This study introduces a flexible, stretchable sensor array that combines strain sensing, tactile sensing, and energy harvesting. This novel textile-based device offers integrated power generation and multi-modal sensing capabilities for wearable applications.

Keywords:
capacitive sensorssmart fabricstrain sensorstactile sensorstriboelectric energy harvester

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Area of Science:

  • Materials Science
  • Wearable Technology
  • Sensor Technology

Background:

  • Developing integrated sensing and energy harvesting systems for wearable devices is crucial for self-powered electronics.
  • Existing flexible sensors often lack multi-modal capabilities or integrated power generation.
  • Textile-based electronics offer unique advantages in comfort and conformability for wearable applications.

Purpose of the Study:

  • To develop a novel power-generating sensor array in a flexible and stretchable form factor.
  • To integrate resistive strain sensors, capacitive tactile sensors, and a triboelectric energy harvester into a single platform.
  • To implement the device using functional threads in a woven textile structure.

Main Methods:

  • Fabrication of functional threads consisting of a hollow tube coated with silver nanowires and a conductive silver thread.
  • Integration of functional threads into a 5x5 sensor cell array within a woven textile.
  • Sensing touch force via capacitance between warp and weft threads.
  • Detecting lateral strain via piezoresistivity of silver nanowire layers.
  • Measuring energy harvesting performance under vertical force application.

Main Results:

  • The device successfully integrates resistive strain sensing, capacitive tactile sensing, and triboelectric energy harvesting.
  • Touch force is detected by measuring capacitance, and lateral strain by resistance changes.
  • The triboelectric energy harvester achieved a maximum power of 201 μW and a power density of 0.48 W/m².
  • The device is implemented in a 60x60 mm² flexible and stretchable woven textile.

Conclusions:

  • A versatile, power-generating sensor array has been successfully demonstrated on a flexible textile platform.
  • The integrated multi-modal sensing and energy harvesting capabilities open new avenues for self-powered wearable electronics.
  • The proposed functional thread design and textile integration offer a scalable approach for advanced wearable systems.