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- since 1996 -

IMG ULTRASUONI SRL
Ultrasonic transducers for industrial applications (NDT) and medical (Doppler effect). Probes, Ultrasonic instruments, Special systems for NDT.

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Technical Discussions
Elmar van den Elzen
Engineering,
Lismar Engineering B.V., Netherlands, Joined Aug 2000, 15

Elmar van den Elzen

Engineering,
Lismar Engineering B.V.,
Netherlands,
Joined Aug 2000
15
01:06 Apr-11-2006
measuring conductivity and permeability

Dear all,

We want to measure the electrical conductivity and the effective magnetic permeability of ferromagnatic samples. The samples typically have a flat site a few cm across. Does anyone know a lab that could do these measurements or know a straight forward method we can set-up ourselves?

Best regards


    
 
 
Linas Svilainis
R & D,
Kaunas University of Technology, Lithuania, Joined Nov 1998, 67

Linas Svilainis

R & D,
Kaunas University of Technology,
Lithuania,
Joined Nov 1998
67
02:25 Apr-11-2006
Re: measuring conductivity and permeability
Dear Elmar,

you wrote
----------- Start Original Message -----------
: ..We want to measure the electrical conductivity and the effective magnetic permeability of ferromagnatic samples...

Maybe it's a complex permeability you want to measure?
If yes:

.. Does anyone know a lab that could do these measurements or know a straight forward method we can set-up ourselves?...

Then RLC meter with some mathematics on geometry will do. We have prepared the paper on toroidal samples complex permeability measurement in low frequency range (0.1-10MHz). If interested, I can send you some excerpts.

People do complex permeability measurement at GHz. For instance, refer to:
Jacquart. Influence of the electrical resistivity of a ferromagnetic thin film on its permeability measurement performed with a permeameter. Elsevier Journal of Magnetism and Magnetic Materials 281 (2004) 82–91

Best regards

Linas


    
 
 
Changqing Lee
Changqing Lee
03:37 Apr-11-2006
Re: measuring conductivity and permeability
I have seen people use alternative current potential drop (ACPD) method for measuring the electrical conductivity and the effective magnetic permeability of ferromagnatic samples at the frequency range of several hundred Hz to 10KHz. Please google it yourself.

Eddy current testing is another option. But to determine conductivity and permeability at the same time is always hard.

----------- Start Original Message -----------
: Dear Elmar,
: you wrote
: : ..We want to measure the electrical conductivity and the effective magnetic permeability of ferromagnatic samples...
: Maybe it's a complex permeability you want to measure?
: If yes:
: .. Does anyone know a lab that could do these measurements or know a straight forward method we can set-up ourselves?...
: Then RLC meter with some mathematics on geometry will do. We have prepared the paper on toroidal samples complex permeability measurement in low frequency range (0.1-10MHz). If interested, I can send you some excerpts.
: People do complex permeability measurement at GHz. For instance, refer to:
: Jacquart. Influence of the electrical resistivity of a ferromagnetic thin film on its permeability measurement performed with a permeameter. Elsevier Journal of Magnetism and Magnetic Materials 281 (2004) 82–91
: Best regards
: Linas
------------ End Original Message ------------




    
 
 
Jim Yukes
Consultant
Canada, Joined Aug 2005, 11

Jim Yukes

Consultant
Canada,
Joined Aug 2005
11
08:15 Apr-13-2006
Re: measuring conductivity and permeability
I checked with a Queens U Magnetics Department Grad & he suggested: There are many different ways to measure permeability depending on the material and application. For some standard methods visit www.astm.org and search for standards with key words "magnetic permeability".

For the conductivity measurement, Google search phrase "contact resistance tester".

----------- Start Original Message -----------
: Dear all,
: We want to measure the electrical conductivity and the effective magnetic permeability of ferromagnatic samples. The samples typically have a flat site a few cm across. Does anyone know a lab that could do these measurements or know a straight forward method we can set-up ourselves?
: Best regards
------------ End Original Message ------------




    
 
 

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