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Optimized Parallel Interrogation and Protection of Piezo-transducers in Electromechanical Impedance Technique

Division of Structures and Mechanics, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798

Suresh Bhalla

Department of Civil Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi 110 041, India

Chee Kiong Soh

Division of Structures and Mechanics, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, csohck{at}ntu.edu.sg

This article presents some of the practical issues concerning the implementation of the electromechanical impedance (EMI) technique for structural health monitoring (SHM) using piezoelectric ceramic (PZT) transducers. New sensor interrogation algorithms utilizing the sensor multiplexing technique are proposed to reduce the time required in interrogating the PZT patches one-by-one for localizing damage. Environmental effects on the admittance signatures of the PZT patch are considered, and a simple and economical technique is proposed to protect the PZT patches. Finally, practical application of PZT transducers in the monitoring of concrete curing is demonstrated.

Key Words: electromechanical impedance (EMI) technique • damage • localization • protection • piezoelectric ceramic (PZT) patch • concrete • curing

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 6, 457-468 (2006)
DOI: 10.1177/1045389X06058792


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