| 摘要 |
The present invention provides a sensor in which an offset problem of the sensor can be solved, that is, a current sensor, a magnetic field sensor, a magnetic bridge that is formed by a magnetic fluid suitably used in the current sensor and the magnetic field sensor, and a magnetic path casing that forms the magnetic fluid whose form is unfixed into a required morphologic magnetic bridge. The magnetic bridge includes a magnetic circuit in which two separated circular magnetic paths mr1 and mr2 are connected by connection magnetic paths cr1 and cr2 made of magnetic materials, the circular magnetic paths mr1 and mr2 being formed by retaining a shape of a magnetic fluid with a container 11, and excitation coils L1 and L2 that are driven by excitation driving means while wound on the connection magnetic paths cr1 and cr2. In the magnetic bridge, a magnetic resistance in the magnetic circuit is appropriately selected to express a magnetic equilibrium state in which a sum of magnetic fluxes of the two circular magnetic paths mr1 and mr2 becomes zero (the magnetic fluxes differ from each other in a direction while being equal to each other in magnitude).
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