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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

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Updated: Jun 18, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Directional Torsion Sensor Based on a Paired Helical-Type Multimode Fiber.

Wenlei Yang1, Ke Tian2, Le Li1

  • 1College of Information and Intelligence Engineering, Zhejiang Wanli University, Ningbo 315100, China.

Sensors (Basel, Switzerland)
|April 12, 2025
PubMed
Summary

This study presents a novel fiber optic torsion sensor that can distinguish twist direction. The sensor utilizes a single-mode-twisted multimode-single-mode fiber structure, offering precise torsion measurement with minimal temperature interference.

Keywords:
directional discriminationmultimode interferenceoptical fiber sensortorsion sensor

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Torsion sensing is crucial in various industrial applications.
  • Existing torsion sensors often suffer from cross-sensitivity to temperature.
  • Developing directional torsion sensors with high accuracy is an ongoing challenge.

Purpose of the Study:

  • To demonstrate a novel fiber optic torsion sensor capable of directional discrimination.
  • To investigate the performance characteristics of the proposed sensor.
  • To evaluate the sensor's susceptibility to temperature variations.

Main Methods:

  • Fabrication of a single-mode-twisted multimode-single-mode (STMS) fiber structure.
  • Fusion-splicing single-mode fibers (SMFs) with a twisted multimode fiber (MMF) segment.
  • Experimental analysis of resonance wavelength shifts under varying twist rates and directions.
  • Quantification of wavelength and transmission sensitivities.
  • Assessment of temperature crosstalk.

Main Results:

  • The STMS fiber sensor successfully discriminated between clockwise and counterclockwise torsion.
  • Resonance wavelength shifts correlated with twist direction and magnitude.
  • Measured wavelength sensitivity: -1.38 nm/rad·m⁻¹.
  • Measured transmission sensitivity: 3.12 dB/rad·m⁻¹.
  • Minimal temperature crosstalk of 0.0072 (rad/m)/°C was observed.

Conclusions:

  • The developed STMS fiber sensor provides directional torsion measurement capabilities.
  • The sensor exhibits high sensitivity and low temperature cross-sensitivity.
  • This technology holds promise for accurate torsion monitoring in environments with temperature fluctuations.