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Transducers/ calibratiions: 2

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  • Transducers/ calibratiions: 2

    I originally sent the following:

    I would like to know if anyone knows what exactly is involved in
    calibrating Forse sensitive resistor type transducers ?
    (used in the EDG)

    NB:
    The transducers are force sensitive resistors that have a hyperbolic
    resistance pressure relationship.
    ----------------------------
    > I can probably answer my own question...I think Langer Biomech
    must of used a load cell...found a paper by
    (Hongsheng, Maalej,Webster, Tompkins, Bach-y-Rita, & Wertsch, 1988)
    A microprocessor-based data acquisition system for monitoring foot
    pressures
    They calibrated sensors using a 440-N load cell as a reference
    which used a piece-wise linear lookup table...which compensates
    for the nonlinearity of the sensor
    ----------------------------
    I also wrote:

    The manufacturer (Langer Biomechanics) says that their new software
    performs sensor calibrations, I would like to know what type (how)
    of calibration is performed by the software ?

    > I am not sure exactly what they do but I assume they translate
    >the voltages into pressures by looking at prestored sensor
    >calibration tables !


    My next questions
    -----------------
    Are these sensors manufactured alike ?
    How accurate are they ?
    (I read 100-200 % variable for pressure)
    Does anyone know where these sensors are manufacured ?
    (The only company I have heard of is Interlink Electronics)

    I encourage any general comments with respect to these types of
    transducers, I am not familiar with the engineering that goes
    into these transducers.
    ..are these FSR's temperature sensitive..
    . or affected by shear or bending .. ?
    What are the pros and cons of FSR type sensors ?

    PS:
    The reason I am asking these questions.. I have no control over the
    calibrations... the EDG does them internally via the software
    and I was asked to document the general concept of such a
    calibration...and also because I have no documentation of the
    characteristics of these specific sensors

    Thanks in advance
    Sincerely,
    Ron
    B7GW@MUSICB.MCGILL.CA
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