Erwin Reichel, Christian Riesch, Bernhard Jakoby,
"A Novel Combined Rheometer and Density Meter Suitable for Integration in Microfluidic Systems"
, in IEEE: IEEE Sensors 2007 Proceedings, Serie Sensors, Seite(n) 903-906, 10-2007, ISBN: 1-4244-1262-5
A Novel Combined Rheometer and Density Meter Suitable for Integration in Microfluidic Systems
Sprache des Titels:
IEEE Sensors 2007 Proceedings
In this contribution we present a combined rheometer and density meter based on two vibrating membranes carrying
electrically conductive paths for excitation and readout. The liquid is contained in a 100 µl volume between the rectangularly
clamped membranes. The vibration is excited by Lorentz forces arising from a static magnetic field provided by a permanent
magnet and the current through the excitation path going back and forth on the vibrating part of the membrane. The sensor
element is designed in such a way that the viscous liquid is subjected to shear stress. Additional conductive loops on the
membrane perform the sensor readout by means of the induced voltage due to motion in a static magnetic field. The measured
frequency response in a range from 500 Hz to 15 kHz allows the determination of the fluids mass density and viscosity. This
novel sensor design is well suited for miniaturization and the integration in microfluidic platforms.