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A Linear Birefringence Measurement Method for an Optical Fiber Current Sensor.

Shaoyi Xu1, Haiming Shao2, Chuansheng Li3

  • 1School of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China. xutianyia@126.com.

Sensors (Basel, Switzerland)
|July 4, 2017
PubMed
Summary

A new linear birefringence measurement method is proposed for optical fiber current sensors (OFCS). This technique accurately measures birefringence across its full range, overcoming previous limitations.

Keywords:
linear birefringencemulti-valued problemoptical fiber current sensor

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Area of Science:

  • Optics
  • Fiber Optics
  • Sensor Technology

Background:

  • Optical Fiber Current Sensors (OFCS) are crucial for electrical measurements.
  • Accurate birefringence measurement is essential for OFCS performance.
  • Existing methods have limitations, particularly with large birefringence values.

Purpose of the Study:

  • To propose and validate a novel linear birefringence measurement method for OFCS.
  • To address the multi-valued problem in birefringence measurement.
  • To eliminate the influence of azimuth angles in the measurement system.

Main Methods:

  • Development of a specific optical configuration for birefringence measurement.
  • Demonstration of a method to eliminate azimuth angle effects.
  • Mathematical determination of the relationship between linear birefringence, Faraday rotation, and sensor output.
  • Simulation and solution for multi-valued linear birefringence.
  • Experimental validation using OFCS with varying fiber turns.

Main Results:

  • The proposed method successfully measures linear birefringence in OFCS.
  • Experimental results show accurate measurements for birefringence values up to 3.5198 rad.
  • The method is effective across the full range of linear birefringence, unlike prior techniques.
  • Elimination of azimuth angle effects was demonstrated.

Conclusions:

  • The proposed linear birefringence measurement method is feasible and accurate for OFCS.
  • This method overcomes the limitation of requiring birefringence to be less than π/2.
  • The technique offers a robust solution for full-range birefringence measurement in optical sensing applications.