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DESIGN AND SIMULATIONS OF INTERDIGITAL TRANSDUCERS FOR LAMB-WAVE BASED SHM SYSTEMS

By Michał Mańka, Mateusz Rosiek, Adam Martowicz, Tadeusz Uhl and Tadeusz Stępiński

Abstract

Structural health monitoring systems have been constantly improved in the past decades. A complete system should consists of two main components: a network of sensors placed on monitored structure and a system of data analysis for its processing and interpretation. Sensors in a SHM system should be builtin to allow for continuous measurement in opposite to non destructive evaluation (NDE) methods where sensors are temporarily mounted on a structure only during measurements. One of the most promising type of the transducers dedicated for SHM systems are Interdigital Transducers (IDT) which are designed for ultrasonic Lamb wave monitoring. Mode selectivity, excitation strength, wave directivity, size and relatively low cost are the most important advantages of IDT. In presented paper after a short introduction of Lamb waves and SHM systems, the advantages and disadvantages of IDT are discussed. Next, the main aspects of designing a narrow band IDT are presented. As an example of the designin

Year: 2011
OAI identifier: oai:CiteSeerX.psu:10.1.1.186.1905
Provided by: CiteSeerX
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