Faraday Effect Based Optical Fiber Current Sensor for Tokamaks

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Abstract

Fiber optical current sensor (FOCS) is a technique considered to be compatible with the ITER nuclear environment. FOCS principle is based on the magneto-optic Faraday effect that produces non-reciprocal circular birefringence when a magnetic field is applied in the propagation direction of the light beam. The magnetic field or the electrical current is deduced from the modification of the state of polarization of light. The linear birefringence of the fiber related with non-perfect manufacturing, temperature changes or stress constitute a parasitic effect that reduces the precision and sensitivity of FOCS. A two-pass optical scheme with a Faraday mirror at the end has been proposed to compensate the influence of linear birefringence. In this paper we perform a Stokes analysis of the two-pass optical scheme to highlight the fact that the linear birefringence is not compensated perfectly by the Faraday mirror when non-reciprocal birefringence such as Faraday effect is also present.

Details

Original languageEnglish
Title of host publicationANIMMA 2011: 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications
Place of PublicationDanvers, United States
Publication statusPublished - Jun 2012
Event2011 - ANIMMA - Advancements in Nuclear Instrumentation Measurement Methods and their Applications: International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications - Ghent, Belgium
Duration: 6 Jun 20119 Jun 2011

Conference

Conference2011 - ANIMMA - Advancements in Nuclear Instrumentation Measurement Methods and their Applications
CountryBelgium
CityGhent
Period2011-06-062011-06-09

Keywords

  • Fiber optical current sensor (FOCS), Faraday effect, linear birefringence compensation, plasma current measurements

ID: 77620