OPTICAL FIBER TEMPERATURE MEASURING DEVICE AND HEATING MEDIUM LEAKAGE DETECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a heating medium leakage detecting device provided with a means for accurately detecting a temperature change caused by leakage of a heating medium and the like even when a temperature gradient is small so that the leakage point of the heating medium as well as occurrence place of a fire caused by cracking of a piping, a gasket, and the like are rapidly and surely detected. SOLUTION: A differenceΔT1' between a difference A, between a reference temperature 21 and the temperature of target parts 62-65, and a difference B, temperature of the target parts is calculated. An amplifier 107 amplifies the result with an amplification factor G1 to provide aΔT1. At an inclination calculating part 108, an inclinationθ1=ΔT1/t is calculated from a measurement interval time (t) and the temperature change amountΔT1. If any one point with relatively large inclination exists among the target parts 62-65, the amplification factor is increased to G2, and an inclinationθ2 a prescribed time after measurement (t) is calculated. If the inclinationθ2 is larger than other target parts while the inclinationθ2 is larger than theθ1, the amplification factor is increased to G3, and an inclinationθ3 is calculated again. An abnormality is judged to exist if it is repeated by prescribed times.