Abstract
It is considered that cable sensor for vibration detection is useful, for instance, to detect the rock falling or small failures of a slope before the occurrence of a big failure. The original cable sensor is susceptible to be yielded by the tensile force, because whose tensile strength is not so enough (40 to 50 kgf). Authors have developed the steel wire cable sensor in which original cable sensor is placed instead of the string of hemp in the central portion. It was necessary to test the sensitivity of this remodeled steel wire cable sensor. As a result of the sensitivity test, following points were clarified: 1) Sensitivity of the steel wire cable sensor does not decrease when the sensor is fixed rigidly or glued continuously to the surfaces of stiff structure made of concrete or steel. 2) Sensitivity of the steel wire cable sensor decreases to 60% against the output of original cable sensor when the cable sensor is buried in the soft land. However, it was confirmed that output level was enough to use practically. In conclusion, the steel wire cable sensor could be used practically to various places to detect vibrations.
