Pulsed Field Magnetometry

PFM Technique

Pulsed Field Magnetometry utilises capacitive discharge to generate high magnetic fields - current laboratory record of 60 Tesla - in conventional resistive solenoids.  The duration of the magnetising current is very short, of the order of milliseconds.  The technique therefore employs short measurement cycles with a small time overhead of post processing of data giving overall measurement cycles significantly shorter than available through other techniques.

F2F technique.
The sample to be measured is subjected to two seperate sinusoidal pulses of magnetic field.  The pulses have different frequencies.  These rapid pulses are applied to the samples and will saturate the samples in both positive and negative senses.  Hirst's internationally patented F2F process uses the resultant measurements and the differences in the frequencies of the applied fields to mathmatically calculate the eddy currents and remove them.

At the end of the test, the magnet can be left fully saturated, calibrated to a specific magnetic field or fully demagnetised.

Any shape magnet can be tested with this technique.  No specific surface finish is required of samples, and the samples do not need any parallel faces as required by some Permeameter techniques.

All Hirst PFM machines are computer controlled and will produce full hysteresis loop traces for all industrial magnetic materials.