Magneto Rheological Device MRD180/1T Option 1: Direct flux density measurement Option 2: True temperature measurement Option 3: Double gap system. Temperature controlled joke. Hall sensor slot. MRF- Magneto Rheological Fluid. Plate for magnetic fluxdensity measurements. Coils.
Option 1: Direct flux density measurement
Option 2: True temperature measurement
Option 3: Double gap system
Hall sensor slot
MRF- Magneto Rheological Fluid
Plate for magnetic fluxdensity measurements
Temperature controlled bottom plateMRD180/1T
after the test (no direct magnetic field measurement)
to control the sample temperature
Zero Gauss Chamber
Hall SensorOption 1: Direct Magnetic Field Measurements
flux density measurements
to changing permeability. The flux
density is measured.
for different flux densities
measurable (proof of simulations)
Simulation data provided by Dr. H. M. Laun et al. BASF Ludwigshafen, 2006
Short switching times are required in MRF application
Switching on and off of the magnetic field (torque in blue, magnetic flux density in red).
Unfiltered raw data sampling of the MCR rheometer (sampling rate 0.1 ms, special firmware) in combination with direct magnetic flux density measurements (option 1) enable the monitoring of switching times.
Example data provided by Dr. H. M. Laun et al. BASF Ludwigshafen
The magnetic field is produced by a flowing current in the coils. Therefore the coils heat up so that the temperature needs to be controlled by a fluid circulator. The occuring sample temperature is therefore influenced by the heat transferred from the coils to the circulating liquid and should be measured as close as possible to the sample.
The „true temperature option“ enables the accurate measurement of the sample temperature with an external temperature sensor in the MRD.
Temperature controlled bottom plateOption 3: Double Gap Measuring System
Hall sensor slot
Plate for magnetic flux density measurements
Shear stress [kPa]
End of PP 20 shear rate regime
Shear rate [1/s]
MRF measured in at magnetic flux densities from 0 to 1 Tesla.