Compact Optical Fiber Faraday Ring Ammeter

Indu Saxena; Roy B. Torbert

doi:10.1117/12.962916

25 January 1990 Compact Optical Fiber Faraday Ring Ammeter

Indu Saxena, Roy B. Torbert

Proceedings Volume 1166, Polarization Considerations for Optical Systems II; (1990) https://doi.org/10.1117/12.962916
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

The magneto-optic (Faraday) effect in dia-magnetic materials is a promising method of measuring magnetic fields or electric currents in space plasmas due to its non-invasive character. Fiber-optic sensors with coherent detection schemes are attractive for these measurements. The Faraday Ring Ammeter (FRA) is the first in a series of space plasma ammeters under development whose ultimate goal is detecting currents with a pA/m2 resolution. This instrument has 450 meters of twisted single mode optical fiber as its sensing element. The optics for injection (including GRIN lenses) and for coherent detection (po-larimetry) are integrated with the electronics in a (6" x 5" x 3") box. Operating at a laser wavelength of 830mn currents as small as a few hundred milliamperes through the FRA have been measured.

Citation Download Citation

Indu Saxena and Roy B. Torbert "Compact Optical Fiber Faraday Ring Ammeter", Proc. SPIE 1166, Polarization Considerations for Optical Systems II, (25 January 1990); https://doi.org/10.1117/12.962916

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