Micro-position sensor using faraday effect
Abstract
A micro-position sensor and sensing system using the Faraday Effect. The sensor uses a permanent magnet to provide a magnetic field, and a magneto-optic material positioned in the magnetic field for rotating the plane of polarization of polarized light transmitted through the magneto-optic material. The magnet is independently movable relative to the magneto-optic material so as to rotate the plane of polarization of the polarized light as a function of the relative position of the magnet. In this manner, the position of the magnet relative to the magneto-optic material may be determined from the rotated polarized light. The sensing system also includes a light source, such as a laser or LED, for producing polarized light, and an optical fiber which is connected to the light source and to the magneto-optic material at a sensing end of the optical fiber. Processing electronics, such as a polarimeter, are also provided for determining the Faraday rotation of the plane of polarization of the back-reflected polarized light to determine the position of the magnet relative to the sensing end of the optical fiber.
- Inventors:
-
- Livermore, CA
- Pittsburgh, PA
- Tracy, CA
- Brentwood, CA
- Issue Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 902642
- Patent Number(s):
- 7183765
- Application Number:
- 10/879,222
- Assignee:
- The Regents of the University of California (Oakland, CA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01D - MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
- DOE Contract Number:
- W-7405-ENG-48
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION
Citation Formats
McElfresh, Michael, Lucas, Matthew, Silveira, Joseph P, and Groves, Scott E. Micro-position sensor using faraday effect. United States: N. p., 2007.
Web.
McElfresh, Michael, Lucas, Matthew, Silveira, Joseph P, & Groves, Scott E. Micro-position sensor using faraday effect. United States.
McElfresh, Michael, Lucas, Matthew, Silveira, Joseph P, and Groves, Scott E. Tue .
"Micro-position sensor using faraday effect". United States. https://www.osti.gov/servlets/purl/902642.
@article{osti_902642,
title = {Micro-position sensor using faraday effect},
author = {McElfresh, Michael and Lucas, Matthew and Silveira, Joseph P and Groves, Scott E},
abstractNote = {A micro-position sensor and sensing system using the Faraday Effect. The sensor uses a permanent magnet to provide a magnetic field, and a magneto-optic material positioned in the magnetic field for rotating the plane of polarization of polarized light transmitted through the magneto-optic material. The magnet is independently movable relative to the magneto-optic material so as to rotate the plane of polarization of the polarized light as a function of the relative position of the magnet. In this manner, the position of the magnet relative to the magneto-optic material may be determined from the rotated polarized light. The sensing system also includes a light source, such as a laser or LED, for producing polarized light, and an optical fiber which is connected to the light source and to the magneto-optic material at a sensing end of the optical fiber. Processing electronics, such as a polarimeter, are also provided for determining the Faraday rotation of the plane of polarization of the back-reflected polarized light to determine the position of the magnet relative to the sensing end of the optical fiber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {2}
}
Works referenced in this record:
The Faraday Effect
journal, January 1999
- Mansuripur, Masud
- Optics and Photonics News, Vol. 10, Issue 11
Fiber Optic Sensors: An Overview
journal, April 1985
- Davis, Charles M.
- Optical Engineering, Vol. 24, Issue 2
Faraday and Kerr Effects in Ferromagnets
book, January 2000
- Shinagawa, K.
- Springer Series in Solid-State Sciences