Mitra Djamal, Yulkifli, Agung Setiadi, Rahmondia N. Setiadi
This paper explains an application of fluxgate element as a low cost vibration sensor. The fluxgate element is a low field magnetic sensor. Because the magnetic field strenght of a position is a function of its distance to the magnetic source, so the magnetic field strenght of a position can be used for determining its distance to the magnetic source. In this research, the fluxgate element is used to measure the position of a vibrating object as a function of time. Magnetic mass is lying on a cantilever which acts as a spring. Due to periodical external force which applied to the magnetic mass, the cantilever will vibrate with the same frequency as the frequency of the vibrating object. As the magnetic mass vibrates, it will also change its distance to the fluxgate element. The fluxgate element will measure this distance as a function of time. By using a good mathematical sensor model the amplitude and frequency of a vibrating system can be determined. With this model, it has been obtained a vibration sensor with relative error under 4.39%.The developed vibration sensor has resonance frequency close to 38 Hz.
Theoretical High Energy Physics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia; Electronics and Instrumentation Research Group, Faculty of Mathematics and Natural Sciences, Padang State University, Padang, Indonesia
