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    Experimental setup showing details of PZT elements and damage positions... | Download Scientific Diagram
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    A piezoelectric sensor circuit consists of an internal resistance Ri, an inductor, and a capacitance Ce that is inversely proportional to the elasticity of the sensor material. A piezoelectric transducer can be modeled as a proportional voltage source and filter network, with the voltage V at the source directly proportional to the applied force, pressure, or strain. The output signal is related to this mechanical force as if it had passed through the equivalent circuit.