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Materials 2017, 10(1), 71; doi:10.3390/ma10010071

Inspection of Piezoceramic Transducers Used for Structural Health Monitoring

Department of Mechanical Engineering, University of Siegen, Paul-Bonatz-Str., 9-11, 57076 Siegen, Germany
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Author to whom correspondence should be addressed.
Academic Editors: M.H. Ferri Aliabadi, Zahra Sharif Khodaei and Dirk Lehmhus
Received: 14 September 2016 / Revised: 24 December 2016 / Accepted: 5 January 2017 / Published: 16 January 2017
(This article belongs to the Special Issue Advances in Structural Health Monitoring for Aerospace Structures)
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Abstract

The use of piezoelectric wafer active sensors (PWAS) for structural health monitoring (SHM) purposes is state of the art for acousto-ultrasonic-based methods. For system reliability, detailed information about the PWAS itself is necessary. This paper gives an overview on frequent PWAS faults and presents the effects of these faults on the wave propagation, used for active acousto-ultrasonics-based SHM. The analysis of the wave field is based on velocity measurements using a laser Doppler vibrometer (LDV). New and established methods of PWAS inspection are explained in detail, listing advantages and disadvantages. The electro-mechanical impedance spectrum as basis for these methods is discussed for different sensor faults. This way this contribution focuses on a detailed analysis of PWAS and the need of their inspection for an increased reliability of SHM systems. View Full-Text
Keywords: piezoelectric transducers; piezoelectric wafer active sensors (PWAS); electro-mechanical impedance (EMI) spectrum; fault detection; diagnosis piezoelectric transducers; piezoelectric wafer active sensors (PWAS); electro-mechanical impedance (EMI) spectrum; fault detection; diagnosis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mueller, I.; Fritzen, C.-P. Inspection of Piezoceramic Transducers Used for Structural Health Monitoring. Materials 2017, 10, 71.

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