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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Related Experiment Video

Updated: Nov 12, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Compact omnidirectional multicore fiber-based vector bending sensor.

Josu Amorebieta1, Angel Ortega-Gomez2, Gaizka Durana2

  • 1Department of Communications Engineering, University of the Basque Country UPV/EHU, 48013, Bilbao, Spain. josu.amorebieta@ehu.eus.

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|March 17, 2021
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Summary
This summary is machine-generated.

We developed a simple fiber optic sensor that accurately measures bending direction and magnitude. This vector bending sensor uses multicore fiber (MCF) to detect subtle changes for precise measurements.

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Area of Science:

  • Optoelectronics
  • Fiber Optics Sensors
  • Material Science

Background:

  • Fiber optic sensors are crucial for precise measurements.
  • Existing sensors may lack accuracy in distinguishing bending direction and amplitude.
  • Multicore fiber (MCF) offers unique spectral properties for sensing applications.

Purpose of the Study:

  • To propose and demonstrate a compact and simple vector bending sensor.
  • To achieve high accuracy in distinguishing both the direction and amplitude of bending.
  • To develop a sensor with a wide measurement range (0° to 360°).

Main Methods:

  • Utilizing a short segment of asymmetric multicore fiber (MCF) fusion spliced to a standard single mode fiber.
  • Analyzing the shift and shrinkage of the reflection spectrum in response to bending.
  • Simultaneously monitoring wavelength shift and light power variations.

Main Results:

  • The sensor accurately distinguishes any bending direction and amplitude.
  • The reflection spectrum exhibits specific shifts and shrinkage patterns correlating to bending.
  • The sensor demonstrates high sensitivity, detecting bending angles below 1°.
  • Full 360° orientation measurement capability was achieved.

Conclusions:

  • The proposed MCF-based sensor offers a simple yet highly accurate method for vector bending measurement.
  • Simultaneous monitoring of spectral shift and power variation enables unambiguous determination of bending parameters.
  • This technology has potential applications in various fields requiring precise directional sensing.