Journal
IEEE SENSORS JOURNAL
Volume 10, Issue 8, Pages 1297-1303Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2010.2044037
Keywords
Frequency; impedance; lead zirconate titanate (PZT) ceramics; structural engineering
Funding
- Brazil's Agency for the Financing Studies and Projects (FINEP)
- Brazil's National Council for Scientific and Technological Development (CNPq)
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Piezoelectric transducers of PZT (lead zirconate titanate) have been widely used in structural health monitoring (SHM) systems based on the electromechanical (E/M) impedance technique. In this technique, damages in the structure are identified by measuring the electrical impedance of the transducer in an appropriate frequency range. Usually, the selection of the correct frequency range to detect and evaluate damage is obtained by trial and error methods. In this paper, it is proposed a formal procedure to determine the frequency ranges in which the PZT transducers are more sensitive for damage detection. Tests were carried out on specimens with different sizes and there was a good match between the theoretical and practical results.
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