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14. A miniaturized stirrer for low viscosity fluids based on a rotating magnetic field generated by solenoids.

Author

Pop, M. N.

Subjects
*MINIATURE electronic equipment, *MIXING machinery, *VISCOSITY, *MAGNETIC fields, *SOLENOIDS, *ELECTROMAGNETIC devices, *ELECTRIC coils, *OPTICAL detectors
Abstract

A method of obtaining the spatially variable magnetic field for low viscosity liquid stirring, using a three pole magnetic system, has been implemented. The three pole electromagnetic system has the largest packing arrangement of coils - possible for cylindrical shaped coil structures. The electromagnets' currents are controlled using a field - programmable - gate - array development board (FPGA) and a system of optical sensors. A magnetic piece is spun by the rotating magnetic field. The behavior of the spinning motion as a function of the driving command signal frequency has been evaluated for various liquid viscosities. [ABSTRACT FROM AUTHOR]

Published
2012
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15. INVESTIGATION OF THERMAL EFFUSIVITY OF THIN SOLIDS IN A LAYERED SYSTEM. FPPE-TWRC APPROACH.

Author

Pop, M. N., Streza, M., Dadarlat, D., and Simon, V.

Subjects
ELECTRIC resonators, CAVITY resonators, PYROELECTRIC detectors, COPPER foil, THIN films, THICK films
Abstract

The front photopyroelectric (FPPE) configuration, together with the thermal-wave resonator cavity (TWRC) method was applied in order to measure the thermal effusivity of thin solids. The methodology is based on a detection cell in which the thin solid layer is inserted between two layers of identical liquids - one layer in contact with the pyroelectric sensor, acting as coupling fluid and the second one acting as backing layer. The value of the thermal effusivity is obtained as a result of a scan of the phase of the FPPE signal as a function of coupling fluid's thickness (TWRC method). The suitability of the method was demonstrated with investigations on a 50μm thick copper foil. [ABSTRACT FROM AUTHOR]

Published
2010

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