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EXTENSION SENSING ACTUATOR

  • US 20110041610A1
  • Filed: 05/27/2008
  • Published: 02/24/2011
  • Est. Priority Date: 05/25/2007
  • Status: Active Grant
First Claim
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1. A method for measuring the extension of a solid state actuator comprising:

  • inputting an acoustic signal to the actuator;

    measuring the acoustic signal that has passed along the actuators; and

    using the measured signal to determine the actuator length or a change to that length.

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