EXTENSION SENSING ACTUATOR
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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Abstract
A device comprising a solid-state actuator (100), means for inputting an acoustic signal to the actuator (104) and means for measuring the resultant signal (104). The measured acoustic signal can be used to determine the extension of the solid-state actuator.
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Citations
31 Claims
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1. A method for measuring the extension of a solid state actuator comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 27)
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13. A device comprising:
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a solid-state actuator; means for inputting an acoustic signal to the actuator; and means for measuring a resultant signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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28. A system comprising:
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a solid-state actuator; means inputting an acoustic signal to the actuator; means measuring the acoustic signal that has passed along the actuator; and means using the measured signal to determine the actuator length or a change to that length.
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29. (canceled)
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31. A device comprising:
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a solid-state actuator; and an acoustic or ultrasonic transducer or resonator incorporated with said solid-state actuator. - View Dependent Claims (30)
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Specification