| 摘要 |
PROBLEM TO BE SOLVED: To easily detect the damage degree of a protective plate for protecting an antenna. SOLUTION: The protective plate 3 for protecting the antenna provided at the front side of an excavator is located in front of the antenna. A plurality of electric resistors 10 are embedded in the protective plate 3 so as to be laminated along a plate thickness direction. The plurality of electric resistors 10 are electrically connected in parallel through metal bodies 11. The damage degree of the protective plate 3 is determined by detecting the combined resistance R of the plurality of electric resistors 10. COPYRIGHT: (C)2006,JPO&NCIPI |
