Magnetic vibration measurement

摘要

Characterisation of such a novel magnetic vibration measurement system showed a sensitivity of 2 mV/mm for sinusoidal excitation of the magnet orthogonal to its magnetisation axis. Vibration measurements over a range of 0.001-1.5mm in amplitude and 40-160 Hz in frequency demonstrate a linear signal response with less than 5% non-linearity. A signal-to-noise ratio of higher than 50dB is measured for a 0.1 mm vibration over the measured frequency range. The presented magnetic solution combines the advantages of low-cost accelerometric systems and of contactless detection by laser-interferometric systems. This may be a particular advantage for the application in multi-sensor vibration monitoring systems and for automotive applications.