| 摘要 |
PROBLEM TO BE SOLVED: To provide a root tip position detector capable of accurately detecting a root tip position. SOLUTION: In the root tip position detector 10, a voltage application means 4 applies a first measuring voltage by a first frequency and a second measuring voltage by a second frequency different from the first frequency, and a current component separation means 5 separates a first imaginary part from a first detection current based on the application of the first measuring voltage and a second imaginary part from a second detection current based on the application of the second measuring voltage. Then, a position detection means 6 detects the position of the root tip 1b by comparing the first imaginary part and the second imaginary part. The position detection means 6 determines that a measuring electrode 2 has reached the root tip 1b when the first imaginary part and the second imaginary part match, for instance. COPYRIGHT: (C)2011,JPO&INPIT |
