| 摘要 |
PURPOSE:To improve measurement precision by using and connecting polarization plane maintaining optical fibers, etc., in series by as many as phases and constituting a sensor head part. CONSTITUTION:Sensor heads 17u, 17v, and 17w are constituted by winding polarization plane maintaining optical fibers, etc., in a coil shape respectively. The heads 17u and 17v are connected in series through a fiber connection part 23u, a single polarization optical fiber 19, and a fiber connection part 22v and the heads 17u and 17w are connected in series through a connection part 23v, a fiber 20, and a connection part 22w to constitute the sensor head part. Further, the light output of an optical multiplexer 15 is made incident on the head 17u through a fiber 16 and a connection part 22u. Connections are made at the connection parts 22u, 22v, and 22w so that axes of propagation of polarized wave modes are aligned with one another and the connection parts 23u, 23v, and 23w make connection while the axes are slanted by 45 deg.. Consequently, a O-phase current component measured value outputted by a signal processing circuit 26 is improved in precision by correcting variation in the intensity of a light source and variation in loss on an optical transmission line.
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