Pressure sensitive cable device for monitoring rock and soil displacement

摘要

The present invention is a substance displacement device. The device includes a sensing unit which is positioned in a drill hole or otherwise within the substance, such as soil or rock. A measurement device is connected to the sensing unit to measure changes in resistance caused by deformation of the sensing device. A control device connected to the measuring device determines whether the change in resistance exceeds a threshold, and thus activates an alarm. The sensing device preferably includes a fixed resistance device across its terminations to enable the establishing of a baseline resistance. The sensing device may include an electrical element or an optical element. The alarm can be any suitable type of alarm.