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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

466
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...
466
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

357
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...
357

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Simulation and Measurement of Strain Waveform under Vibration Using Fiber Bragg Gratings.

Nurzhigit Smailov1, Sauletbek Koshkinbayev2, Bazarbay Aidana1

  • 1Department of Electronics, Telecommunications and Space Technologies, Satbayev University, Almaty 050013, Kazakhstan.

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Summary

New methods using fiber Bragg gratings can measure strain under high-frequency vibration or pulsed loads. These techniques analyze reflected light power over time to accurately determine strain magnitude and frequency responses.

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deformationdigital signal processingfiber Bragg gratingsensorstrainvibration

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Area of Science:

  • Optical Engineering
  • Materials Science
  • Mechanical Engineering

Background:

  • Traditional strain measurement methods face limitations with high-frequency vibrations and pulsed mechanical actions.
  • Fiber Bragg gratings (FBGs) offer a promising sensing technology but require advanced signal processing for dynamic strain analysis.

Purpose of the Study:

  • To develop and validate novel methods for determining object strain using FBGs under challenging dynamic conditions.
  • To enable accurate strain measurements across a wide range of magnitudes and frequencies, overcoming limitations of existing techniques.

Main Methods:

  • Numerical processing of time-dependent reflected optical power from FBGs at various wavelengths.
  • Utilizing common fiber-optic components for simultaneous or sequential registration of reflected power.
  • Employing numerical simulations and experimental validation for method verification.

Main Results:

  • Demonstrated ability to restore strain dependence on time up to ±1000 μϵ and beyond.
  • Successful measurement of strain parameters under high-frequency vibration and pulsed mechanical loads.
  • Experimental validation for linear vibration cases, showing good agreement with numerical simulations.

Conclusions:

  • The proposed methods provide an efficient and accurate approach for dynamic strain monitoring using FBGs.
  • These techniques are suitable for applications involving high-frequency vibrations and pulsed mechanical impacts.
  • Further discussion addresses the practical challenges and considerations for implementing these methods.