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Miniature magneto-optic angular position sensor

Vedran Budinski, Simon Pevec, Stanislav Čampelj, Alenka Mertelj, Darja Lisjak, and Denis Donlagic

Open Access Open Access

Abstract

This Letter describes a miniature Fabry–Perot, contactless, magneto-optic sensor for angular position measurement. The sensor utilizes a magneto-optic fluid comprising barium hexaferrite nanoplatelets that become birefringent in the presence of an external magnetic field and a compact fiber-optic sensor system for tracking the liquid’s optical axis direction. An efficient temperature compensation system is provided which allows the use of otherwise highly temperature-sensitive magneto-optic liquids. An unambiguous measurement range of 90° and a resolution of better than 0.05° are demonstrated experimentally.

© 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

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Supplementary Material (1)

NameDescription
Visualization 1       Demonstration of operation of the miniature magneto-optical angular position sensor.

Data availability

Data underlying the results presented in this Letter are not publicly available at this time, but may be obtained from the authors upon reasonable request.

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Figures (5)
Fig. 1.
Fig. 1. (a) Sensor setup and the microcell design and (b) the fabricated sensor with housing submerged in the magneto-optic fluid.

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Fig. 2.
Fig. 2. Gaussian-windowed, back-reflected optical spectrum readouts from both channels at three different angular positions of the magnets: Φ = 0°, 45°, and 90°.

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Fig. 3.
Fig. 3. (a) Measured phase (obtained using the FFT algorithm) and calculated relative RI changes for both polarization axes/channels. (b) Measured RI difference between both polarization axes/channels. (c) Calculated angular position Φ of the magnets (see Visualization 1).

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Fig. 4.
Fig. 4. (a) Measurements of relative RI along both polarization axes when changing the temperature by 25 K and rotating the magnets continuously. (b) Difference between both RI measurements.

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Fig. 5.
Fig. 5. Demonstration of the sensor’s resolution: left and right movements of the rotational stage from 0.05° to 0.45° in 0.05° steps.

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Equations (4)

Equations on this page are rendered with MathJax. Learn more.

n L P x = n 0 + 1 2 Δ n b cos ⁡ 2 Φ ,
n L P y = n 0 − 1 2 Δ n b cos ⁡ 2 Φ ,
n L P x − n L P y = Δ n b cos ⁡ 2 Φ .
Φ = 1 2 ( arccos ⁡ ( n L P x − n L P y Δ n b ) ) .
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