| 摘要 |
PROBLEM TO BE SOLVED: To easily find a water leakage site in a building by placing an external electrode in a conductive medium placed on a waterproof material of the building, applying voltage between the external electrode and an internal electrode placed on a building body and detecting skewness in a potential distribution on a surface of the waterproof material. SOLUTION: A medium 31 conducting electricity, such as water or a mat including water, is put on a waterproof material, a waterproof sheet 2 for example, on a roof 4 of a building 1, and an external electrode 12 is placed in the medium 31. On the other hand, an internal electrode 13 is placed in a body 6 of the building 1, voltage is applied between the electrodes 12, 13 by a power source 10, and current flowing between the electrodes 12, 13 is measured by an ammeter 11. If there is no breakage on the waterproof sheet 2, no current flows, while if there is breakage current flows through a broken part 30, resulting in skewness in a potential distribution generated with the broken part 30 as the center. The skewness in the potential distribution is caught by a measuring electrode 21 placed in a mesh in the vicinity of the waterproof sheet 2 to sense the broken part 30 (leakage site). |
