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Proceedings Paper

Measurement Of Megampere Currents With Optical Fibers
Author(s): L. Veeser; D. Kania; B. Freeman; P. Kruse; E. Zimmermann
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Paper Abstract

We have used fiber optic sensors routinely to measure multi-megampere currents. The sensors are low noise, absolutely calibrated, and electrically decoupled from the pulsed power source. Polarized light from a HeNe laser is guided past the current carrier by a single-mode, low-birefringence fiber. The magnetic field from the current causes a Faraday rotation of the light polarization which is detected by a polarization analyzer and photo-diode at the end of the fiber. We observe a rotation of about 250°/MA ± 5%, slightly less than the Verdet constant for non-birefringent silica glass. We find that highly birefrin-gent (polarization preserving) optical fibers do not work in this application. We are now trying to ruggedize the sensor for field use with high-explosive-driven current sources by using a diode laser and single mode fiber couplers to replace the laboratory system of lenses and spatial filters.

Paper Details

Date Published: 7 November 1983
PDF: 5 pages
Proc. SPIE 0380, Los Alamos Conf on Optics '83, (7 November 1983); doi: 10.1117/12.934782
Show Author Affiliations
L. Veeser, Los Alamos National Laboratory (United States)
D. Kania, Los Alamos National Laboratory (United States)
B. Freeman, Los Alamos National Laboratory (United States)
P. Kruse, Los Alamos National Laboratory (United States)
E. Zimmermann, Los Alamos National Laboratory (United States)

Published in SPIE Proceedings Vol. 0380:
Los Alamos Conf on Optics '83
Robert S. McDowell; Susanne C. Stotlar, Editor(s)

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