Current sensor using heterodyne detection.
Based on the Faraday effect for measuring ac current, we describe a fiber-optic sensor that uses laser-diode intensity modulation to perform heterodyne signal detection. The sensor output at the carrier frequency is used as a reference signal to normalize the results. The sensing element consists of a few coils low-birefringence fibers between polarizers. We built the current sensor described above and tested its performance--sensitivity and noise--as functions of the angle between polarizers.
Ferrari
J A
JA
Facultad de Ingenería, Instituto de Física, J Herrera y Reissig 565, 11300 Montevideo, Uruguay.
Dubra
A
A
Arnaud
A
A
Perciante
D
D