Artículo
Alterating current sensor using second harmonic detection
Fecha
2000Registro en:
Ferrari, José, Perciante, Daniel, Dubra, A., Arnaud, Alfredo, Frins, Erna. Alterating current sensor using second harmonic detection [en línea] Applied optics, 2000, v. 39, no. 25
Autor
Ferrari, José
Perciante, Daniel
Dubra, A
Arnaud, Alfredo
Frins, Erna
Institución
Resumen
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.