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Optical Engineering

Magnetostatic field measurement by optical heterodyne method with magnetic fluids
Author(s): Yukitoshi Otani; Toru Yoshizawa; Atsushi Tanahashi
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Paper Abstract

We propose an optical heterodyne method to measure the magnetostatic field using a magnetic fluid with high sensitivity. This measurement system consists of a stabilized transverse Zeeman laser, an optical isolator with a Faraday rotator and a half-wave plate, and a sensor. The probe light passes through the magnetic fluid twice in the sensing part. These optical components are connected by the polarization-maintaining fiber. This fiber sensor is independent of temperature and external stress because both the reference and probe beat signals are compared for their phase difference using two bundle fibers. The magnitude of the magnetostatic field as well as its azimuthal direction is obtained from the phase difference. The results obtained are a resolution of ~0.1 Oe and a measurement of up to 500 Oe.

Paper Details

Date Published: 1 April 1994
PDF: 5 pages
Opt. Eng. 33(4) doi: 10.1117/12.163194
Published in: Optical Engineering Volume 33, Issue 4
Show Author Affiliations
Yukitoshi Otani, Tokyo Univ. of Agriculture and Technology (Japan)
Toru Yoshizawa, Tokyo Univ. of Agriculture and Technology (Japan)
Atsushi Tanahashi, Tokyo Univ. of Agriculture and Technology (Japan)


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