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    • 2. 发明专利
    • DE4312184A1
    • 1994-10-20
    • DE4312184
    • 1993-04-14
    • SIEMENS AG
    • BOSSELMANN THOMAS DR
    • G01R15/24G01R19/00G01R15/07
    • PCT No. PCT/DE94/00248 Sec. 371 Date Sep. 29, 1995 Sec. 102(e) Date Sep. 29, 1995 PCT Filed Mar. 10, 1994 PCT Pub. No. WO94/24572 PCT Pub. Date Oct. 27, 1994An alternating current in a conductor is measured using a Faraday element. The Faraday element is disposed around the conductor and linearly polarized light is supplied to the device. The plane of polarization of the linearly polarized light is rotated through a measuring angle in the Faraday element. This light is divided into two light signals having planes of polarization at right angles to each other. The two light signals are converted into corresponding electrical signals by optoelectric converters. These electric signals are split into their direct signal components and their alternating signal components. The quotients of the difference and sum of the alternating signal components as well as the quotient of the difference and sum of the direct signal components are calculated. A temperature-compensated measuring signal is derived from these calculated quotients.