Abstract
The electromechanical impedance (EMI) technique is considered to be one of the most promising methods for developing structural health monitoring (SHM) systems. This technique is simple to implement and uses small and inexpensive piezoelectric sensors. However, practical problems have hindered its application to real-world structures, and temperature effects have been cited in the literature as critical problems. In this paper, we present an experimental study of the effect of temperature on the electrical impedance of the piezoelectric sensors used in the EMI technique. We used 5H PZT (lead zirconate titanate) ceramic sensors, which are commonly used in the EMI technique. The experimental results showed that the temperature effects were strongly frequency-dependent, which may motivate future research in the SHM field.
Highlights
Piezoelectric sensors have been intensively studied in recent years for an important and promising application, the structural health monitoring (SHM) of various types of structures, such as bridges and Sensors 2014, 14 aircrafts
We estimate the sensitivity of the system to detect structural damage by calculating the root mean square deviation (RMSD) and coefficient deviation metric (CCDM) indices for damage with different intensities induced in the aluminum beam
The effects of the temperature on the electrical impedance signatures of the sensor are analyzed in detail
Summary
Piezoelectric sensors have been intensively studied in recent years for an important and promising application, the structural health monitoring (SHM) of various types of structures, such as bridges and Sensors 2014, 14 aircrafts. The main purpose of SHM systems is to monitor a structure and detect incipient damage, thereby increasing safety and reducing maintenance costs. The electromechanical impedance (EMI) technique [9] is considered one of the most promising of these various methods, because it is very simple to implement and uses low-cost, small and lightweight piezoelectric sensors. These sensors consist of adhesive tapes bonded to the host structure that are minimally invasive and can be used in real time and in in-situ SHM systems
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