Deformation detection sensor with temperature correction
First Claim
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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Abstract
A deformation detection sensor including: 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 an 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 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.
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Citations
5 Claims
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1. A deformation detection sensor, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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Specification