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Magnetic device for density measurement

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3 Author(s)
Aroca, C. ; Dept. Fis. de Mater., Fac. Fisica, Madrid, Spain ; Rodriguez, M. ; Sanchez, P.

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%

Published in:

Magnetics, IEEE Transactions on  (Volume:26 ,  Issue: 5 )

Date of Publication:

Sep 1990

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