Current measurements by Faraday rotation in single-mode optical fibers

Journal Article · Wed May 01 04:00:00 EDT 1985 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138070· OSTI ID:5539523

Chandler, G I; Jahoda, F C

Development of techniques for measuring magnetic fields and currrents by Faraday rotation in single-mode optical fibers has continued. We summarize the results of attempts to measure the toroidal plasma current in the ZT-40 reversed field pinch using multiturn fiber coils. The fiber response is reproducible and in accord with theory, but the amount and distribution of the stress-induced birefringence in this case are such that prediction of the sensor response at low currents is difficult if not impossible. The low-current difficulty can be overcome by twisting the fiber to induce a circular birefringence bias. We report the results of auxiliary experiments with a fiber that has been twisted with 15 turns per meter and then recoated to lock the twist in place.

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5539523
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 56:5; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700102* -- Fusion Energy-- Plasma Research-- Diagnostics
BIREFRINGENCE
CHALCOGENIDES
CURRENTS
ELECTRIC CURRENTS
FARADAY EFFECT
FIBER OPTICS
FIBERS
MAGNETIC FIELDS
MINERALS
OPTICAL FIBERS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLASMA DIAGNOSTICS
POLARIZATION
REFRACTION
SILICA
SILICON COMPOUNDS
SILICON OXIDES
ZT-40 DEVICES