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Re: Responses to my small force sensor post

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  • Re: Responses to my small force sensor post

    Our firm ( builds low force dynamic test systems
    for tissue engineering, orthopedics et al and use Interface and Sensotec
    load cells. Sensotec has a broader low force product line. I have
    personally used both for many years. I was the former load cell product
    engineer at MTS in early 70's when they used Lebow and helped redirect
    their decisions to buy from Interface in 1976. Recently Honeywell bought
    Lebow and added them to the Sensotec line so they seem to be intent on
    expanding in general. Both firms are good suppliers. Go to

    Bob Brosch
    TestResources Inc
    Minnesota of course
    800 430 6536 X133


    -----Original Message-----
    From: * Biomechanics and Movement Science listserver
    [mailto:BIOMCH-L@NIC.SURFNET.NL] On Behalf Of Liang, Yongqiang
    Sent: Wednesday, October 05, 2005 4:39 PM
    Subject: [BIOMCH-L] Responses to my small force sensor post

    Some time ago I posted a post to ask for information on small force
    to measure the Groung Reaction Force for mice(body weight around 25
    Here are the responses I have got. As some folks asked for them.
    I have seen a different approach taken by Robert Full at UC-Berkeley. He
    uses a semi-hard, transparent gel and was able to correlate diffraction
    patterns with force in insects.

    He is very approachable and would likely provide you information on the

    Interface makes some ultra low capacity load cells (ULC series) in that
    range - - that
    need a thin aluminum plate to
    put the on. Probably ~ $400... Pressure Profile Systems may have a flat
    pressure pad in that range too but it will be expensive.
    i'm not sure if there's any way to design a circuit to make these
    things work in the range you're describing ... but tekscan
    ( ) makes inexpensive flexible
    sensing resistors
    that are labelled for 0 to 1 pound range. i know you can modify the
    drive circuit to increase the range, so i wonder if you can do the
    same to decrease the range.

    as far as size, they're a bit large (0.375 inch diameter) ... but
    again, i know they can make them to custom shapes/sizes ... i just
    don't know what the lower limit for size is, or what quantities you
    need to order to get custom sizes.
    Dear Mr. Liang,

    You can consider Kistler piezoelectricforce sensor. Please visit for more information.

    If you are located in China, please let me know your phone no., so I can
    talk to you on the phone.

    Best regards,

    Jacky Ma
    Regional Manager
    Kistler China Limited
    Unit D, 24/F, Seabright Plaza
    9-23 Shell Street, North Point, Hong Kong
    Tel + 852 2591 5930
    Mobile + 852 9651 1747
    Fax + 852 2591 1885
    I know a french research professor, Patrick Even, working in Paris, at
    INAPG institute, who developped small metabolism cage for mice, that
    can record mice activity with piezoelectric sensors positionned under
    bottom of the cage. He also created a start-up to sell these original
    You can contact him at this email adress :
    Issues to think about:

    Is the sensor stiff enough? If the natural frequency of the sensor is
    then you will end up with a lot of low-frequency noise that will screw
    your signal. Simply for measuring maximum forces this might not be a
    deal, but to measure details about the force patterns this might be a
    concern. I would shoot for a natural frequency >500 Hz.

    The following paper might also be useful: