Piezoelectric Active-Sensor Diagnostics and Validation Using Instantaneous Baseline Data

This paper presents a signal processing tool that efficiently performs piezoelectric (PZT) sensor diagnostic and validation. Validation of the sensor/actuator functionality during structural health monitoring (SHM) operation is a critical component to successfully implement a complete and robust SHM...

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Bibliographic Details
Published in:IEEE sensors journal 2009-11, Vol.9 (11), p.1414-1421
Main Authors: Overly, T.G., Gyuhae Park, Farinholt, K.M., Farrar, C.R.
Format: Article
Language:English
Subjects:
Active-sensing
Actuators
Admittance measurement
Array signal processing
Diagnostic software
Electric variables measurement
Lead zirconate titanates
Mathematical models
Monitoring
piezoelectric transducers
Piezoelectricity
Robustness
Sensor arrays
Sensor systems
sensor validation
Sensors
Signal processing
structural health monitoring
Studies
Temperature sensors
Transducers
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Summary:This paper presents a signal processing tool that efficiently performs piezoelectric (PZT) sensor diagnostic and validation. Validation of the sensor/actuator functionality during structural health monitoring (SHM) operation is a critical component to successfully implement a complete and robust SHM system, especially with an array of PZT active-sensors involved. The basis of this method is to track the capacitive value of PZT transducers, which manifests in the imaginary part of the measured electrical admittance. Both degradation of the mechanical/electrical properties of a PZT transducer and the bonding defects between a PZT patch and a host structure can be identified by the proposed process. However, it is found that the temperature variations in sensor boundary conditions manifest themselves in similar ways in the measured electrical admittances. Therefore, we examine the effects of temperature variation on the sensor diagnostic process and develop an efficient signal processing tool that enables the identification of a sensor validation feature that can be obtained instantaneously without relying on prestored baselines. This paper concludes with experimental results to demonstrate the effectiveness of the proposed technique.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2009.2018351