Does anyone know of any force plates manufactured with non-ferrous metals?
A potential project may require the use of a force plate within the magnetic
field of an open MRI, which is impossible using ferrous-metal plates.

Thanks in advance for your help,
Shawn Hunter

Thanks to all who responded. Most replies recommended Bertec, which makes a
non-conductive force plate specifically for use with electromagnetic motion
tracking systems. Their website is www.bertec.com; I have focused on their
4060 NC series force plate. AMTI and Kistler were also suggested, but I
have not looked into these yet. Additional options:

----- Original Message -----
From: Young-Hui Chang
To: Shawn Hunter
Sent: Thursday, December 02, 1999 8:17 PM
Subject: Re: Question about force plates

> Hi Shawn,
> Unfortunately, I don't know of any commercially available plates of the
> type you describe, but I had an idea for you if you don't have any luck
> with commercially available items.
> If your platform does not need to be too large, Kistler makes a 'Build
> Own Force Platform' Kit, which consists of four load cells and the
> materials to attach them to your own custom-platform. I wonder whether a
> non-ferrous, fiber reinforced composite plate could be placed within the
> MRI machine while the load cells could be connected to it outside of the
> machine?
> I don't have much experience with MRI machines other than having been in
> one about 10 years ago, but i thought i remembered there being an open end
> on either side where each end of the platform (with the metal load cells)
> could stick out.
> If you hadn't already considered this, another problem to consider with
> kind of force transducing device inside an NRI machine (whether it uses a
> ferrous platform or not) is the electric current that is required to sense
> the deformation mechanical. Both piezoelectric- and strain gauge- load
> cells require a voltage change to be measured to be able to transduce any
> forces. The electric currents from these load cells I imagine might
> the magnetic field within the coils.
> Sounds like an interesting technical problem. Good luck!
> Young-Hui Chang
> ---------------------------------------
> Young-Hui Chang (it's pronounced "young-hee")
> e-mail:
> snail-mail:
> 3060 VLSB
> Locomotion Lab, Dept. of Integrative Biology
> University of California, Berkeley
> Berkeley, CA 94720-3140
> Phone: 510-642-8662
> Fax: 510-643-6264
> http://socrates.berkeley.edu/~hbbiomxl/YoungHui/
> ---"Learning how animals get from here to there."---

----- Original Message -----
From: Janusz Blaszczyk
To: Shawn Hunter
Sent: Friday, December 03, 1999 5:44 AM
Subject: Re: Question about force plates

> Hi Shawn,
> I am using an duraluminum force plate which is produced here in Poland by
> the Military Institute of Aviation Medicine or related to them a private
> company. It is very good force plate and its cost with A/D converter and
> software is about $11 000. If you need more detail I can contact with them
> and ask to contact you.
> Dr. Janusz W. Blaszczyk, Ph.D., D.Sc.
> Nencki Institute of Experimental Biology,
> Warsaw, Poland.

----- Original Message -----
From: Supplied by:
Sent: Friday, December 03, 1999 5:06 AM
Subject: Force Plate

> Hello Shawn,
> I make an aluminium force plate measuring 600 x 400 x 100 mm equiped with
> four aluminium load cells. Strain gauges and bending elements are used.
> Andrew Hofmeyr

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