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. 2016 Sep 30;16(10):1627.
doi: 10.3390/s16101627.

Compensation of Verdet Constant Temperature Dependence by Crystal Core Temperature Measurement

Slobodan J Petricevic  1 , Pedja M Mihailovic  2
Affiliations

Compensation of Verdet Constant Temperature Dependence by Crystal Core Temperature Measurement

Slobodan J Petricevic et al. Sensors (Basel). .

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.

Keywords: Faraday effect; fiber optic current sensor; optical activity; temperature compensation.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Measurement setup.
Figure 2
Figure 2
Measured optical activity vs. the temperature of the Bi12GeO20 crystal.
Figure 3
Figure 3
Measured temperature dependence of the Verdet constant of the Bi12GeO20 crystal.
Figure 4
Figure 4
Current in the Helmholtz coils sensed by the reference ampermeter, the uncompensated FOCS, and the temperature compensated FOCS.
Figure 5
Figure 5
Comparison of relative errors of the uncompensated and compensated FOCS.
See this image and copyright information in PMC

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