ACCELEROMETERS

ACCELEROMETERS
Accelerometers consist of a micro machined silicon mass suspended
by mulitple beams from a silicon frame. Piezoresistors located in
the beams change their resistance as the motion of the suspended mass changes
the strain in the beams. Silicon caps on the top and bottom of the
accelerometers are added to provide over-range stops. Th accelerometer
design provides for a low profile, high shock resistance, durability
and built-in damping over a wide usable bandwidth.

  • accelerometers

  • OEM sensors

  • potentiometer

  • load cells
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    • Schaevitz servo accelerometers are DC operated closed-loop force
    balance trandsducers for the masurement of acceleration. They are more
    stable and accurate than open-loop accelerometers by several orders of
    magnitude. Undesirable characteristics inherent in open-loop
    accelerometers such as sensitivity to supply voltage, non-linearity in
    the acceleration-to-position pickoff, and high thermal coefficients of
    scale factor and zero shift are neglible in closed-loop force balance
    accelrometers.

    Schaevitz servo accelerometers are closed-loop torque balance systems.
    A pendulous mass develops a torque proportional to the product of its
    mass unbalance and the applied acceleration. Motion of the mass is
    detected by a position sensor whose output signal is applied to an
    electronic amplifier. The output current from the servo amplifier is
    applied to a torque motor, which then develops a torque equal but
    directly opposed to the inital torque of the pendulous mass. Thus the
    mass stops moving, assuming a position minutely differing from its
    original position before acceleration. The current through the torque
    motor is accuratley proportional to input acceleration, and then passed
    through a stable resistor, an accurately proportional output voltage is
    developed.
         		JEWELL LCM accelerometers are general-purpose acceleration
    sensors for industrial, commercial and aerospace applications.
    Engineered with micromachined components the LCM offers
    attractive price/performance ratio. This 0.5G to 4G device meets
    the demanding needs of applications requiring 500G shock
    resistance and up to 500Hz bandwidth.

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