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  • Title: Stray magnetic-field response of linear birefringent optical current sensors.
    Author: Macdougall TW, Hutchinson TF.
    Journal: Appl Opt; 1995 Jul 20; 34(21):4373-9. PubMed ID: 21052272.
    Abstract:
    It is well known that the line integral, describing Faraday rotation in an optical medium, reduces to zero at low frequencies for a closed path that does not encircle a current source. If the closed optical path possesses linear birefringence in addition to Faraday rotation, the cumulative effects on the state of polarization result in a response to externally located current-carrying conductors. This effect can induce a measurable error of the order of 0.3% during certain steady-state operating conditions.
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