| 摘要 |
PROBLEM TO BE SOLVED: To provide a ground water logging method in which, depth where there is a water path, can be accurately inspected.SOLUTION: A logging tool 2 which is depressed into a borehole at predetermined speed, comprises: a hollow cylindrical state logging tool body 20 whose upper and lower ends are opened; a measurement metal wire 21 disposed on an outer peripheral wall of the logging tool body 20, and receiving an affection of flow in which, flow of ground water entering from a water path into the borehole, and flow caused by depression of the logging tool body 20 are mixed; and a reference metal wire 22 disposed on an inner peripheral wall of the logging tool body 20, and receiving an affection of flow caused by depression of the logging tool body 20. Energization causes the measurement metal wire 21 and the reference metal wire 22 to generate heat, so that the electric resistance is increased following to increase of temperature, and the flow of the ground water releases heat from these metal wires to lower the temperature, so that the electric resistance of the metal wires is reduced.SELECTED DRAWING: Figure 2 |
