Abstract

A new approach to the measurement of large currents at high potential is presented in which the output signal from a conventional current transformer is measured by transducing the voltage developed across the transformer secondary into phase modulation in a fiber-optic interferometer through a piezoelectric element. The demonstrated current range was 140 A, although the system is capable of measuring current as great as 3000 A. The current resolution is >10⁻¹ $\text{A}/\sqrt{\text{Hz}}$ over a frequency range of 30–10⁴ Hz.

© 1991 Optical Society of America

Miniature Faraday current sensor based on multiple critical angle reflections in a bulk-optic ring

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