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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...
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Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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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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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...

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Related Experiment Video

Updated: May 14, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
08:23

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Published on: September 30, 2019

Fiber Bragg grating strain modulation based on nonlinear string transverse-force amplifier.

Kuo Li1, Man Hong Yau, Tommy H T Chan

  • 1Civil Engineering and Built Environment, Queensland University of Technology, Brisbane, Australia. tolikuo@gmail.com

Optics Letters
|February 6, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel fiber Bragg grating (FBG) force sensor. This new method uses a stretched string to amplify force, offering higher sensitivity and smaller sensor size for various applications.

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Area of Science:

  • Optics and Photonics
  • Mechanical Engineering
  • Materials Science

Background:

  • Traditional fiber Bragg grating (FBG) strain modulation relies on altering the distance between fixed ends.
  • Existing FBG sensors have limitations in sensitivity and size for certain force-sensing applications.

Purpose of the Study:

  • To demonstrate an alternative FBG strain modulation technique.
  • To enhance the sensitivity and reduce the size of FBG-based force sensors.
  • To explore applications in multiaxial force monitoring and FBG accelerometer resonant frequency control.

Main Methods:

  • Applying a transverse force to a stretched string to induce axial force.
  • Leveraging the nonlinear amplification relationship between transverse and axial forces.
  • Integrating this principle into fiber Bragg grating (FBG) sensor design.

Main Results:

  • Achieved a more sensitive force modulation method compared to traditional FBG techniques.
  • Demonstrated potential for improved FBG force sensor sensitivity and miniaturization.
  • Showcased applicability for reducing the number of FBGs in multiaxial monitoring systems.
  • Indicated control over the resonant frequency of FBG accelerometers.

Conclusions:

  • The novel transverse force application method offers a more sensitive approach to FBG strain modulation.
  • This technique presents significant advantages for FBG force sensor design, multiaxial monitoring, and accelerometer applications.