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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

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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...
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Simultaneous Temperature and Strain Measurements Using Polarization-Maintaining Few-Mode Bragg Gratings.

Chongxi Wang1, Zhanhua Huang1, Guifang Li2

  • 1Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China.

Sensors (Basel, Switzerland)
|December 5, 2019
PubMed
Summary
This summary is machine-generated.

This study demonstrates simultaneous temperature and strain measurement using a novel fiber optic sensor. The polarization-maintaining few-mode Bragg grating (PM-FMF-FBG) offers high discrimination efficiency for accurate sensing applications.

Keywords:
few-mode fibersfiber Bragg gratingsfiber optics sensorspolarization-maintaining fibers

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Area of Science:

  • Optoelectronics
  • Fiber Optic Sensors
  • Materials Science

Background:

  • Accurate simultaneous measurement of temperature and strain is crucial for structural health monitoring and industrial process control.
  • Existing fiber optic sensors face challenges in achieving high sensitivity and discrimination for multiple parameters.

Purpose of the Study:

  • To demonstrate simultaneous measurement of temperature and strain using a polarization-maintaining few-mode Bragg grating (PM-FMF-FBG).
  • To analyze the wavelength and phase modulation characteristics of the even LP11 mode for sensing applications.

Main Methods:

  • Utilized a polarization-maintaining few-mode Bragg grating (PM-FMF-FBG).
  • Employed wavelength and phase modulation of the even LP11 mode for interrogation.
  • Leveraged polarization interference for selective polarization excitation of reflection spectra.

Main Results:

  • Achieved simultaneous temperature and strain measurement with a discrimination efficiency of 98%.
  • Measured wavelength shift sensitivities of 10 pm·°C⁻¹ (temperature) and 0.73 pm·με⁻¹ (strain).
  • Measured phase sensitivities of -3.2 × 10⁻² rad·°C⁻¹ (temperature) and 4 × 10⁻⁴ rad·με⁻¹ (strain).

Conclusions:

  • The developed PM-FMF-FBG sensor effectively enables simultaneous and accurate measurement of temperature and strain.
  • Experimental results for phase sensitivity show good agreement with theoretical calculations.
  • This technology holds promise for advanced sensing applications requiring multi-parameter detection.