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SUMMARY - Non-conductive Force Plates

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  • SUMMARY - Non-conductive Force Plates

    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; 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
    > ---"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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