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Premananda Dey1, Rohit Shukla1, Archana Sharma1

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This study presents a novel fiber optic probe for measuring mega-ampere currents. By twisting optical fiber, it overcomes birefringence, achieving high sensitivity for current measurement.

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Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Current Measurement

Background:

  • Accurate measurement of high currents is crucial in various industrial and research applications.
  • Traditional current sensors can face limitations in terms of isolation, bandwidth, and electromagnetic interference.
  • Fiber optic sensing offers potential advantages due to its inherent electrical isolation and immunity to electromagnetic interference.

Purpose of the Study:

  • To design and demonstrate a novel fiber optic probe for measuring mega-ampere currents.
  • To investigate the use of a twisted single-mode optical fiber for enhanced current sensing.
  • To overcome the challenge of linear birefringence in optical fiber current probes.

Main Methods:

  • A fiber optic probe utilizing a 658 nm wavelength light source was designed.
  • Linearly polarized light was launched into a manually twisted single-mode optical fiber.
  • Intensity variations of the modulated light were detected using a fast photodetector (100 nS rise-time).
  • The optical fiber was twisted at a rate of 40 twists per meter to mitigate birefringence.

Main Results:

  • The designed probe successfully measured mega-ampere currents.
  • The sensitivity of the probe was determined to be 0.247° polarization rotation per kA current-turn product for a single optical fiber loop.
  • Manual twisting of the optical fiber effectively compensated for undesired linear birefringence.

Conclusions:

  • The developed fiber optic probe is a viable solution for mega-ampere current measurement.
  • Twisted single-mode optical fiber is an effective method for overcoming birefringence in such probes.
  • The probe demonstrates high sensitivity and potential for practical applications requiring precise high-current monitoring.