Alternating current sensor with second-harmonic detection

José A. Ferrari; César D. Perciante; Alfredo Dubra; Alfredo Arnaud; Erna M. Frins

doi:10.1364/AO.39.004638

Alternating current sensor with second-harmonic detection

José A. Ferrari, César D. Perciante, Alfredo Dubra, Alfredo Arnaud, Erna M. Frins

Facultad de Ingeniería (UdelaR)

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45°, a signal of twice the frequency of the ac is generated-in addition to the usual signal with the same frequency as the current. The quotient of these two signals allows a normalized output to be obtained that is proportional to the amplitude of the current. Experimental results demonstrating the practicality of the procedure are presented.

Original language	English
Pages (from-to)	4638-4640
Number of pages	3
Journal	Applied Optics
Volume	39
Issue number	25
DOIs	https://doi.org/10.1364/AO.39.004638
State	Published - 1 Sep 2000
Externally published	Yes

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AU - Ferrari, José A.

AU - Perciante, César D.

AU - Dubra, Alfredo

AU - Arnaud, Alfredo

AU - Frins, Erna M.

PY - 2000/9/1

Y1 - 2000/9/1

N2 - We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45°, a signal of twice the frequency of the ac is generated-in addition to the usual signal with the same frequency as the current. The quotient of these two signals allows a normalized output to be obtained that is proportional to the amplitude of the current. Experimental results demonstrating the practicality of the procedure are presented.

AB - We describe a novel optical sensor based on the Faraday effect for measuring ac. The sensing element is a piece of material of high Verdet constant placed between polarizers. When the angle between the polarizers differs by 45°, a signal of twice the frequency of the ac is generated-in addition to the usual signal with the same frequency as the current. The quotient of these two signals allows a normalized output to be obtained that is proportional to the amplitude of the current. Experimental results demonstrating the practicality of the procedure are presented.

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JO - Applied Optics

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Alternating current sensor with second-harmonic detection

Abstract

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