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Deformation detection sensor with temperature correction

  • US 7,543,503 B2
  • Filed: 10/05/2007
  • Issued: 06/09/2009
  • Est. Priority Date: 10/10/2006
  • Status: Expired due to Fees
First Claim
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1. A deformation detection sensor, comprising:

  • a piezoelectric element which generates an output signal due to a deformation;

    a reference signal input device which inputs a reference signal of a predetermined cycle to the piezoelectric element;

    a first signal extraction device which extracts a first output signal due to the deformation of the piezoelectric element out of the output signal from the piezoelectric element;

    a second signal extraction device which extracts a second output signal due to the reference signal out of the output signal from the piezoelectric element;

    a first evaluation device which evaluates the voltage of the first output signal extracted by the first signal extraction device; and

    a second evaluation device which evaluates the second output signal extracted by the second signal extraction device, by evaluating a capacitance or a dielectric constant of the piezoelectric element.

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