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Sensors 2016, 16(10), 1627; doi:10.3390/s16101627

Compensation of Verdet Constant Temperature Dependence by Crystal Core Temperature Measurement

School of Electrical Engineering, University of Belgrade; 11000 Belgrade, Serbia
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Author to whom correspondence should be addressed.
Academic Editors: Manuel Lopez-Amo, Jose Miguel Lopez-Higuera and Jose Luis Santos
Received: 23 August 2016 / Revised: 26 September 2016 / Accepted: 26 September 2016 / Published: 30 September 2016
(This article belongs to the Special Issue Optical Fiber Sensors 2016)
View Full-Text   |   Download PDF [1037 KB, uploaded 30 September 2016]   |  

Abstract

Compensation of the temperature dependence of the Verdet constant in a polarimetric extrinsic Faraday sensor is of major importance for applying the magneto-optical effect to AC current measurements and magnetic field sensing. This paper presents a method for compensating the temperature effect on the Faraday rotation in a Bi12GeO20 crystal by sensing its optical activity effect on the polarization of a light beam. The method measures the temperature of the same volume of crystal that effects the beam polarization in a magnetic field or current sensing process. This eliminates the effect of temperature difference found in other indirect temperature compensation methods, thus allowing more accurate temperature compensation for the temperature dependence of the Verdet constant. The method does not require additional changes to an existing Δ/Σ configuration and is thus applicable for improving the performance of existing sensing devices. View Full-Text
Keywords: Faraday effect; fiber optic current sensor; temperature compensation; optical activity Faraday effect; fiber optic current sensor; temperature compensation; optical activity
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MDPI and ACS Style

Petricevic, S.J.; Mihailovic, P.M. Compensation of Verdet Constant Temperature Dependence by Crystal Core Temperature Measurement. Sensors 2016, 16, 1627.

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