Optical sensor of magnetic fields
Abstract
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.
- Inventors:
- Issue Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- OSTI Identifier:
- 6707776
- Application Number:
- ON: DE87007222
- Assignee:
- Dept. of Energy
- DOE Contract Number:
- AC04-76DP00789
- Resource Type:
- Patent
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- 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)
Citation Formats
Butler, M A, and Martin, S J. Optical sensor of magnetic fields. United States: N. p., 1986.
Web.
Butler, M A, & Martin, S J. Optical sensor of magnetic fields. United States.
Butler, M A, and Martin, S J. Tue .
"Optical sensor of magnetic fields". United States.
@article{osti_6707776,
title = {Optical sensor of magnetic fields},
author = {Butler, M A and Martin, S J},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {3}
}