Piezo-composite transducer for mode and direction selectivity of Lamb waves
Konferenz: Sensoren und Messsysteme 2010 - 15. ITG/GMA-Fachtagung
18.05.2010 - 19.05.2010 in Nürnberg
Tagungsband: Sensoren und Messsysteme 2010
Seiten: 6Sprache: EnglischTyp: PDFPersönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt
Porchez, Thomas; Bencheikh, Nabil; Letty, Ronan Le (Cedrat Technologies, Meylan, France)
Ringgaard, Erling (Ferroperm Piezoceramics A/S, Kvistgaard, Denmark)
Ultrasonic-based SHM (Structural Health Monitoring) applications commonly rely on the use of piezo-electric patches to emit and receive ultrasonic waves. The objective is to study the propagation of the waves through a structure to assess its structural integrity. Because of the elevated number of echoes and possible modes of propagation of the waves within the structure, those applications suffer from a burden of signal processing. This paper presents a composite piezo-electric patch that was designed and successfully tested for reducing the complexity of the SHM detection schemes by selecting the mode and direction of the Lamb waves received. The piezo-composite is composed of a row of eight independent ceramic pillars separated with polymer, so it is a 1-D matrix of independent piezo-patches. Used with adequate electronics and signal processing, it was shown that it allowed selecting the direction and the mode of the Lamb waves.