LONG DISTANCE GROUND THERMAL PHYSICAL QUANTITY MEASURING APPARATUS

摘要

PROBLEM TO BE SOLVED: To enable simply to obtain the thermal physical quantity of a bed in the longitudinal direction of a sensor, and detect permeation or the like of ground water on the basis of the change of thermal physical quantity. SOLUTION: An optical fiber 3 for temperature measurement which has a heat source outer coating film 2 whose heating value per unit length is uniform is buried in ground. The coating film 2 can generate heat when electric power is fed from a voltage supplying device on the ground surface. The optical fiber 3 can measure a temperature corresponding to the longitudinal direction of a sensor.