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Updated: Jun 13, 2026
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
Fiber-optic heterodyne phase-shift easurement of plasma current
Applied Optics
|May 8, 2010
Summary
This study introduces a novel optical current sensor using twisted fiber and heterodyne detection, overcoming previous limitations. It achieves high resolution in challenging environments, matching traditional methods.
Area of Science:
- Physics
- Electrical Engineering
- Materials Science
Background:
- Faraday rotation methods for current measurement suffer from distortions caused by linear birefringence.
- Existing methods often require complex setups with multiple detectors and intensity normalization.
Purpose of the Study:
- To develop a robust optical current sensor that overcomes distortion issues.
- To simplify the measurement setup by using a single detector.
- To achieve high-resolution current measurement in demanding environments.
Main Methods:
- Combining twisted optical sensing fiber with heterodyne phase detection of circular birefringence.
- Utilizing a single output detector without intensity normalization.
- Implementing the sensor by winding fiber around existing machinery.
Main Results:
- Successfully overcame distortion problems associated with residual linear birefringence.
- Achieved a resolution of 400 ampere-turns.
- Demonstrated excellent agreement with conventional Rogowski coil measurements.
- Operated effectively in the electromagnetic environment of a thermonuclear fusion research device.
Conclusions:
- The novel twisted fiber sensor provides an accurate and robust solution for current measurement.
- This method simplifies optical current sensing and enhances reliability in harsh conditions.
- The technology shows promise for applications in fusion research and other demanding fields.
