| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain a downsized and low-cost device without requiring a power source generating a large current. <P>SOLUTION: A coated cable surface dirt detection device comprises: an injection electrode 2 that is capacitively coupled with a central conductor 12a of a coated cable 12; a detection electrode 3 that is capacitively coupled with the central conductor 12a; an AC voltage generation part 4 that generates test AC voltage V2, and injects the test AC voltage V2 into the central conductor 12a through the injection electrode 2 in a non-contact manner; a current detection part 5 that inputs a portion of current Id2, which is generated in the coated cable 12 by the injection of the test AC voltage V2, through the detection electrode 3, converts the current Id2 into detection voltage Vd and outputs the detection voltage Vd; and a processing part 7 that calculates a ratio k of a voltage value of the detection voltage Vd to a voltage value of the test AC voltage V2, and determines that a surface of the coated cable 12 is dirty when the calculated ratio k is equal to or greater than a predetermined reference ratio kref. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
