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Landslide monitoring often includes observing in two conditions, slope movements and groundwater levels. This measurement involves the observation of deformation direction. However, the range and reliability of current slope stability monitoring are often limited on sensors, instrumentation costs, and power requirements. This paper presents an attractive solution for slope stability monitoring that aims to be inexpensive, versatile, and reliable. A displacement sensor based on spring coil as an actuator was build and tested for slope deformation and potential failures. The inductance of spring coil will change when deformed (compression or strain) and the physical quantity that can be measured. It has a long 1.2m, diameter 3cm, and 80 turns. The electronic systems consist of LC oscillator, comparator, universal frequency to digital converter (UFDC), and ADC. The output voltage of sensor has a maximum measurement of 0.43V up to 4.48V and frequency oscillation between 583kHz up to 1.853MHz. This sensor can detect a small deformation of the ground with a relative error under 5% and an absolute error under 3 cm.

High Sensitivity Spring Coil as Displacement Sensor for Slope Stability Monitoring