ACTF:

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   Generic sensor or actuator model. The model is

   x              exp(-delay*s)
   -  = -----------------------------------
   u    (s^2 + 2*zeta*w + w^2)*(tau*s + 1 )


   Any term may be omitted. Uses a 2nd order delay model.
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   Form:
   g = ACTF( e )
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   ------
   Inputs
   ------
   e           (n)   Sensor data structure
                     .delay
                     .tau
                     .zeta
                     .w
                     .name   Name of the device

   -------
   Outputs
   -------
   g           (:)   Sensor state space model of type statespace

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Children:

Common: Classes/@statespace/statespace.m
Common: Control/Delay
Common: Control/FResp
Common: Control/ND2SS
Common: Control/SSEmpty
Common: Control/Series
Common: Graphics/Rename