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Related Concept Videos

Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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...
Measurements of Strain01:27

Measurements of Strain

Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain gauge...

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A Fully Printable Strain Sensor Enabling Highly-Sensitive Wireless Near-Field Interrogation.

Hassan A Mahmoud1,2, Hussein Nesser1,2, Tarek M Mostafa3

  • 1Mechanical Engineering Program, Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 21, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a novel, printable wireless strain sensor using radio frequency (RF) technology. The inexpensive device offers high sensitivity for structural health monitoring in composite materials.

Keywords:
NFCSHMcapacitive strain sensorsembedded sensorspassive RF sensors

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Mechanical Engineering

Background:

  • Wireless, passive, and flexible strain sensors are crucial for advanced structural health monitoring.
  • Current limitations include the need for wired connections and active power sources.
  • Operational simplicity and adaptability are key benefits of wireless sensor technology.

Purpose of the Study:

  • To develop a novel, fully printable, inexpensive, and ready-to-use wireless strain sensor.
  • To leverage radio frequency (RF) technology for passive, wireless strain measurement.
  • To demonstrate the sensor's efficacy in monitoring composite structures.

Main Methods:

  • Fabrication of a wireless sensor using RF technology and screen-printing.
  • Integration of piezoresistive electrodes with capacitive sensors for enhanced sensitivity.
  • Utilizing a near-field communication (NFC) tag with an inductor-capacitor (LC) resonant circuit.
  • Testing the sensor's performance in measuring strain on a glass fiber-reinforced polymer (GFRP) specimen.

Main Results:

  • The sensor achieved a high gauge factor (GF) of ≈16 at 20 MHz for strains below 5% in capacitive mode.
  • Wireless strain monitoring demonstrated a significant resonance frequency shift (GF of ≈2.2).
  • Excellent performance was observed in wirelessly monitoring strain during a GFRP bending test.

Conclusions:

  • The developed sensor is a cost-effective and adaptable solution for structural health monitoring.
  • The technology shows significant potential for embedded sensing in various composite structures.
  • This work paves the way for advanced, non-invasive monitoring of critical infrastructure.