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An Absolute Electric Current Probe Based on the Faraday Effect.

W Caton1, J Katzenstein1

  • 1Maxwell Laboratories, Inc., San Diego, CA 92123.

Journal of Research of the National Bureau of Standards (1977)
|September 27, 2021
PubMed
Summary
This summary is machine-generated.

This study presents a novel electric current probe utilizing Faraday rotation in polarized light. This absolute measurement instrument offers high time resolution for precise circuit analysis.

Keywords:
Faraday effectVerdet constantabsolute instrumentelectric currentmeasurementpolarized light

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Area of Science:

  • Physics
  • Electrical Engineering
  • Optics

Background:

  • Accurate electric current measurement is crucial in various electrical and electronic applications.
  • Traditional current probes may face limitations in calibration, accuracy, or response time.
  • Optical methods offer potential for non-invasive and absolute current sensing.

Purpose of the Study:

  • To design, construct, and test a novel probe for measuring electric current.
  • To utilize the Faraday rotation effect for absolute current measurement.
  • To achieve high time resolution in current sensing.

Main Methods:

  • The probe employs a beam of polarized light encircling the current-carrying conductor.
  • Faraday rotation, induced by the magnetic field of the current, is measured.
  • The calibration relies on the Verdet constant of the optical medium.

Main Results:

  • The developed probe functions as an absolute instrument for electric current measurement.
  • Calibration is independent of probe geometry and position relative to the conductor.
  • The probe demonstrates a time resolution on the order of nanoseconds.

Conclusions:

  • The Faraday rotation-based current probe offers an absolute and potentially highly accurate measurement method.
  • This technology is suitable for applications requiring fast and precise current monitoring.
  • Further development can optimize the probe for various industrial and research settings.