| 摘要 |
Disclosed is an electromagnetic field sensor, by which discriminating operation can be simplified, and a cable can be discriminated rapidly and correctly. The clamp-type sensor (30) is provided with: a substantially annular electrode (31), which is composed of a nonmagnetic material having conductivity, and which surrounds a part of a cable in the circumferential direction in a state where the cable is clamped; a magnetic core (33), which is composed of a magnetic material, and is disposed on the outer side of a ring (31a) of the electrode (31) with an insulator (32) therebetween; a winding wire (34), which is wound around the magnetic core (33); and an output section (35), which is led out by means of a lead wire (35a) from the electrode (31), and led out from both the ends of the winding wire (34) by means of a lead wire (35b). An inductive current generated in the winding wire (34) due to electromagnetic induction is outputted from the output section (35), and a voltage generated in the electrode (31) due to electrostatic induction is outputted from the output section (35). |
