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Title: Optical sensor of magnetic fields

An optical magnetic field strength sensor for measuring the field strength of a magnetic field comprising a dilute magnetic semi-conductor probe having first and second ends, longitudinally positioned in the magnetic field for providing Faraday polarization rotation of light passing therethrough relative to the strength of the magnetic field. Light provided by a remote light source is propagated through an optical fiber coupler and a single optical fiber strand between the probe and the light source for providing a light path therebetween. A polarizer and an apparatus for rotating the polarization of the light is provided in the light path and a reflector is carried by the second end of the probe for reflecting the light back through the probe and thence through the polarizer to the optical coupler. A photo detector apparatus is operably connected to the optical coupler for detecting and measuring the intensity of the reflected light and comparing same to the light source intensity whereby the magnetic field strength may be calculated.
Authors:
;
Publication Date:
OSTI Identifier:
6707776
DOE Contract Number:
AC04-76DP00789
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Research Org:
Sandia National Labs., Albuquerque, NM (USA)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; MAGNETOMETERS; FARADAY EFFECT; MAGNETIC SEMICONDUCTORS; OPTICAL FIBERS; CADMIUM; ELECTROMAGNETIC PULSES; HIGH-VOLTAGE PULSE GENERATORS; LIGHTNING; MAGNETIC FIELDS; MANGANESE; MEASURING INSTRUMENTS; PHOTODETECTORS; POLARIZATION; TELLURIUM; USES; WAVE PROPAGATION; ELECTRIC DISCHARGES; ELECTROMAGNETIC RADIATION; ELECTRONIC EQUIPMENT; ELEMENTS; EQUIPMENT; FIBERS; FUNCTION GENERATORS; MATERIALS; METALS; PULSE GENERATORS; PULSES; RADIATIONS; SEMICONDUCTOR MATERIALS; SEMIMETALS; TRANSITION ELEMENTS 440300* -- Miscellaneous Instruments-- (-1989)