Title :
Magnetic device for density measurement
Author :
Aroca, C. ; Rodriguez, M. ; Sanchez, P.
Author_Institution :
Dept. Fis. de Mater., Fac. Fisica, Madrid, Spain
fDate :
9/1/1990 12:00:00 AM
Abstract :
A very sensitive device for liquid-density measurements was developed by using a linear variable differential transducer (LVDT) and a magnetic actuator based on an Nd-Fe-B magnet attached to a floater. The device gives 300 mV of output for a change in density of 0.5%. The stability and performance of the device are discussed. Taking into account the fact that the current through the actuator coil is driven directly by a 12-b digital-to-analog converter, changes of 0.001% in the liquid density would be detectable for a dynamic range of 8% in density fluctuations. Actually, small movements in the liquid reduce the sensitivity to 0.01%
Keywords :
actuators; boron alloys; density measurement; iron alloys; magnetic devices; neodymium alloys; permanent magnets; 300 mV; LVDT; NdFeB magnet; actuator coil; density fluctuations; digital-to-analog converter; linear variable differential transducer; liquid-density measurements; magnetic actuator; sensitivity; Coils; Density measurement; Digital-analog conversion; Dynamic range; Fluctuations; Hydraulic actuators; Magnetic devices; Magnetic liquids; Stability; Transducers;
Journal_Title :
Magnetics, IEEE Transactions on
