PURPOSE: To measure a fluid/flow con-dimensionally and continuouly in point of time, and also investigate underground water level or the position or magnitude of underground water flow.
CONSTITUTION: A fluidflow sensor 10 has a lengthy structure in which an optical fiber 12 and a heating wire 14 are covered with a heat resisting electric insulating material 16 and integrated. This fluid/flow sensor is set in the ground, a current is carried to the heating wire to generate heat, and the temperature distribution laid along the optical fiber is measured, whereby underground water level or flow is investigated. Further, the fluid/flow sensor is inserted into a boring in which underground water is present, the current is carried to the heating wire to generate heat while measuring the temperature distribution laid along the optical fiber, and the magnitude of the flow of underground water is investigated by the change on standing of temperature distribution.
MAMIYA KIYOSHI
FUJII SEISHI
TAKAHASHI AKINORI
JAPAN ENERGY CORP