Acceleration and inclination sensors based on magnetic levitation

摘要: Some fields such as the Monitoring of Civil Engineering Structures, need very sensitive acceleration and inclination sensors with a high resolution at low accelerations (typically less than 1G) moderate frequencies 20 Hz) or small inclinations 1°). The instruments currently available for measurements are either precision (hence costly), used in seismology globe physics cheaper products lacking sensitivity needed having inadequate ranges both frequency intensity. Such situation hinders considerably updating construction codes seismic zones well study complex soil-structure interaction phenomenon risk areas. This thesis proposes to utilization magnetic levitation designing sensors, simple enough meet needs particular applications like monitoring civil engineering works. Levitating mass an inertial sensor does free its design all constraints created by mechanical link between base instrument, which render present so expensive. Two techniques have been investigated testing two prototypes. A triaxial using Active Magnetic Bearings technique uniaxial passive diamagnetic thus implemented tested. Experimental results obtained these prototypes not better those available, but they do validate concept. As part this research, active has under angle somewhat different from classical application since use is subject rather inherent bearing. Furthermore, up now, diamagnetism found few engineering, analytical model along criteria that can be starting point implementation micro-mechatronic systems based on levitation.