SENSING COIL AND SENSING UNIT FOR SAGNAC OPTICAL F

专利名称：SENSING COIL AND SENSING UNIT FOR

SAGNAC OPTICAL FIBRE CURRENT SENSOR

发明人：HAYWOOD, JOHN申请号：EP09713616申请日：20090220公开号：EP2245426A4公开日：20121031

摘要：A sensing coil for a Sagnac interferometer current sensor is disclosed, thesensing coil (14) being composed of an optical fibre (for example a spun polarising Hi-Bifibre) that is arranged in use to transmit a single elliptical polarisation state and thesensing coil comprising at least two interconnected loops (15 and 16 or 26 and 27 or 28and 29). At least one of the loops is arranged in use to enclose a current conductor (11,12 or 25) and the loops are interconnected such that light propagating in a first direction(23 or 30) in the first loop will propagate in a second, opposite, direction (24 or 31) in theother or, if more than one, in each other loop, whereby the sensing coil provides minimalsensitivity to rotational movement. Also disclosed are a sensing unit (Fig. 5) thatincorporates the sensing coil and a current sensor (Fig. 1) that incorporates the sensingunit.

申请人：SMART DIGITAL OPTICS PTY LIMITED

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