| 摘要 |
PURPOSE:To repeatedly measuring the flow direction of a fluid which moves at an extremely low velocity by enabling a substitute fluid, having different electrical or chemical properties from the fluid to be measured, to be charged in and discharged from an observation, part and then detecting the movement of said substitute fluid. CONSTITUTION:While a sleeve 5 is moved down to the lowest position, a probe 3 is lowered into a boring hole. Then, pressureized water is fed into a hydraulic hose 65 to move the sleeve 51 up. When underground water flows into an observation part 20, a substitute fluid which is charged in the observation part 20 already and has different electric or chemical properties with the underground water flows out. This outflow is detected by using respective measuring electrodes 10 to obtain the flow velocity and direction of the underground water. For remeasurement, the substitute fluid is injected again into the observation part 20 by a substitute fluid charging and discharging mechanism 30. In the observation part 20, a stirring mecahnism 71 is provided to acelerate the uniforming of the substitute fluid, thus speeding the measuring operation. |
