DETECTOR FOR ABNORMAL SOIL, DETECTION SYSTEM FOR ABNORMAL SOIL, AND ITS DETECTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a detecting device for abnormal soil, a detection system therefor, and detection method therefor capable of early, precisely detecting a position having a high possibility of a soil disaster.;SOLUTION: An optical fiber temperature and deflection meter 2 measures a temperature (an index decreasing in accordance with increase of water content in soil) in respective positions of the optical fiber sensor 1 by detecting backscattering light output from the optical sensor 1, when a first pulse beam is input in the optical fiber sensor 1, and the back scattering light output from the optical fiber sensor 1 is detected when a second pulse beam is input in the optical fiber sensor 1, thereby, a deflection quantity (an index increasing in accordance with the increase of the moving earth) is measured. A difference (temperature fluctuation value) between measured temperature in respective positions and a reference temperature of a reference temperature table and deflection quantity judges whether it is within a threshold value or not and the judged result is output.;COPYRIGHT: (C)2003,JPO