Register to reply

Measuring the permeability of metallic objects

by daudaudaudau
Tags: measuring, metallic, objects, permeability
Share this thread:
Jan7-13, 10:31 AM
P: 296
Hello everyone. I'm working on a project where I have to do a finite element simulation of low frequency magnetic coupling. But my problem is that I don't know the permeability of all the objects involved. Can anyone suggest a good way to measure the permeability of these objects ? The objects are quite irregularly shaped, i.e. not spheres or boxes or cylinders.

I have one idea myself. I could make a coil of sufficient size and then put the object inside this coil, and measure the inductance. Then I could set up an identical finite element simulation and then adjust the permeability of the object until I get the same results as in the measurement.
Phys.Org News Partner Physics news on
Step lightly: All-optical transistor triggered by single photon promises advances in quantum applications
The unifying framework of symmetry reveals properties of a broad range of physical systems
What time is it in the universe?
Simon Bridge
Jan7-13, 06:12 PM
Sci Advisor
HW Helper
Simon Bridge's Avatar
P: 12,961
That is pretty much what you do all right. That way the geometry considerations should take care of themselves.
Jan11-13, 12:38 PM
P: 661
Permeability of materials is normally measured on purposely-made toroidal cores, to get sensible values.

In normal life, if these objects are undesired, they have unit of infinite permeability. Often accurate enough, because air gaps rather than metals determine the flux. Or take 1000, then 10000, and observe no difference.

If the field is intense enough, saturation can be more important than permeability. Uncommon with separated objects.

Register to reply

Related Discussions
Measuring distance between objects of known size in photo General Math 20
Floating objects and measuring their weight General Physics 16
Microwave vs metallic objects General Physics 10
If objects are accelerating, are we measuring the systems getting smaller? Cosmology 5
Confusing on permeability and relative permeability Classical Physics 3