Calibrated Faraday current and magnetic field sensor
We have developed a calibrated optical fiber Faraday rotation current sensor. A strong magnetic field in an optical fiber introduces circular birefringence, causing the plane of polarization of light to rotate by amount proportional to the magnetic field. Faraday loops used in the past were nonlinear due to the stress-induced linear birefringence caused by bending the loop. This linear birefringence interfered with the Faraday rotation, yielding a complicated relationship between the current and detected light signal. We have found a way to overcome the effects of the unwanted linear birefringence and produce a calibrated current waveform. The calibration is limited only by the accurate knowledge of the Verdet constant of the optical fiber. Results of recent experiments, as well as planned measurements will be presented. 5 refs., 3 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5571529
- Report Number(s):
- SAND-85-0356C; CONF-850887-12; ON: DE85015507
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
47 OTHER INSTRUMENTATION
AMMETERS
BIREFRINGENCE
DETECTION
ELECTRIC MEASURING INSTRUMENTS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
EQUIPMENT
FARADAY EFFECT
FIBERS
MAGNETIC FIELDS
MEASURING INSTRUMENTS
OPTICAL FIBERS
RADIATIONS
REFRACTION
SIGNAL-TO-NOISE RATIO
VISIBLE RADIATION