Optical heterodyne measurement of magnetic field using magnetic fluid

Yukitoshi Otani; Toru Yoshizawa; Atsushi Tanahashi

doi:10.1117/12.140819

15 February 1993 Optical heterodyne measurement of magnetic field using magnetic fluid

Yukitoshi Otani, Toru Yoshizawa, Atsushi Tanahashi

Proceedings Volume 1756, Interferometry: Applications; (1993) https://doi.org/10.1117/12.140819
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

This paper describes measurement of magnetic field using magnetic fluid. Magnet fluid shows a strong magnet-optical effect: a birefringence is induced by the magnetic field. Optical heterodyne method has high sensitivity to measure the birefringence. This measurement system consists of a stabilized transverse Zeeman laser, an optical isolator consisting of a Faraday rotator and a half wave plate and the sensor part. These optical components are connected by the polarization maintaining fiber (PMF) and bundle fiber. The two-frequency orthogonally polarized light from light source is led to the sensor part by the PMF. This light is divided into the measurement and the reference light. The probe light passes through the magnetic fluid twice by the mirror. Then it traces back through the bundle fiber to the photo detector after passing the polarizer. The beat signal is compared for the phase difference with the reference signal that is obtained from reference lights behind polarizer transmitted by another bundle fiber. This fiber sensor is independent of temperature and external stress. The magnitude of the magnetic field is received from the phase difference. The results are received sub-Oersted of the resolution and 500 Oersted in the range of the measurement.

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Yukitoshi Otani, Toru Yoshizawa, and Atsushi Tanahashi "Optical heterodyne measurement of magnetic field using magnetic fluid", Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); https://doi.org/10.1117/12.140819

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KEYWORDS

Magnetism

Birefringence

Sensors

Heterodyning

Magnetic sensors

Polarizers

Laser stabilization

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