Vibration is a periodic oscillatory motion around its initial position. When an object vibrates, it also changes its distance relatively to another object. If one places a magnetic source on the vibrating object, so a magnetic sensor can measure its position by measuring the magnetic field strength from a reference position. There are two parameters that should be determined of a vibrating object, namely amplitude and frequency. Using Fourier Transform and a good mathematical model, these two parameters can be well determined. For this purpose, we have developed a vibration sensor based on fluxgate magnetic sensor. A mathematical model using 4~(th) order polynomial approach has been developed for this sensor. Using this model, the developed sensor can measure vibration in the range of 0.5 to 2.5 g with relative errors below 3%.
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