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Optical Engineering

Magnetic field measurements using magneto-optic Kerr effect sensors
Author(s): Steven A. Oliver; Charles A. DiMarzio; Scott C. Lindberg; Aniruddha B. Kale
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Paper Abstract

A novel optically based magnetic field sensing technique is developed that uses a thin magnetic film as the sensing element and the longitudinal and transverse magneto-optic Kerr effects in an optical read technique. The linear system response is tested for small magnetic fields using a simple free-space ellipsometry measurement system. Measurements taken at 8 mHz showed a magnetic field sensitivity of 4 x 10-3 Oe, with a system dynamic range of over 60 dB. The noise spectrum was dominated by 1/f noise. Calculations for a shot-noise-limited measurement system indicate that a magnetic field sensitivity of 10-6 Oe/Hz1/2 may be possible through enhancement of the sensing element parameters and 100-mW light sources.

Paper Details

Date Published: 1 November 1994
PDF: 5 pages
Opt. Eng. 33(11) doi: 10.1117/12.181938
Published in: Optical Engineering Volume 33, Issue 11
Show Author Affiliations
Steven A. Oliver, Northeastern Univ. (United States)
Charles A. DiMarzio, Northeastern Univ. (United States)
Scott C. Lindberg, Northeastern Univ. (United States)
Aniruddha B. Kale, Northeastern Univ. (United States)

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