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Related Experiment Video

Updated: May 12, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
09:48

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Published on: November 7, 2016

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Optical Fiber Temperature and Torsion Sensor Based on Lyot-Sagnac Interferometer.

Li-Yang Shao1, Xinpu Zhang2, Haijun He3

  • 1Center for Information Photonics & Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China. lyshao@home.swjtu.edu.cn.

Sensors (Basel, Switzerland)
|October 27, 2016
PubMed
Summary

A novel optical fiber sensor using a Lyot-Sagnac interferometer enables simultaneous temperature and torsion measurement. This enhanced sensor design improves temperature sensitivity and provides a clear relationship for torsion detection.

Keywords:
Lyot-Sagnac interferometerfiber sensorhigh-birefringence fibertemperature and torsion sensor

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Area of Science:

  • Photonics
  • Fiber Optics Sensing
  • Interferometry

Background:

  • Traditional sensors often struggle with simultaneous measurement of multiple physical parameters.
  • Lyot-Sagnac interferometers offer potential for novel sensing applications.
  • High-birefringence (HiBi) fiber is sensitive to external perturbations.

Purpose of the Study:

  • To propose and demonstrate an optical fiber sensor for simultaneous temperature and torsion measurement.
  • To enhance the sensitivity of temperature sensing compared to single Sagnac interferometers.
  • To establish a reliable method for torsion angle detection using spectral changes.

Main Methods:

  • Implementation of a Lyot-Sagnac interferometer incorporating two sections of HiBi fiber.
  • One HiBi fiber section designated as the temperature-sensitive region, the other as a reference.
  • Experimental validation of the sensor's response to temperature variations and fiber twisting.

Main Results:

  • The sensor exhibits a temperature sensitivity of -17.99 nm/°C, over 12 times greater than single Sagnac interferometers.
  • Temperature changes cause a measurable shift in the output spectrum's envelope.
  • Fiber torsion directly influences fringe visibility, following a sine relationship with the twist angle up to 360°.

Conclusions:

  • The proposed Lyot-Sagnac interferometer effectively enables simultaneous measurement of temperature and torsion.
  • The distinct responses of spectral envelope shift and fringe visibility allow for independent parameter determination.
  • This sensor design presents a significant advancement in multi-parameter optical fiber sensing.