Abstract
This paper presents the application of micro-machined ultrasonic air transducers (MUT) to material characterization. The transducers are made of thin membrane capacitors with very thin vacuum gaps. A system analysis that details the design of the transducers and the transmitter and receiver electronics to deliver over a 100-dB dynamic range while operating in the 1–5-MHz range is presented. The transducers and electronics system are used both in pulse–echo and pitch–catch modes to evaluate materials. In transmission and reflection, the system is used to image defects in carbon epoxy composites. Transducers are designed, using Lamb wave theoretical calculations, to excite selected Lamb wave modes in composite and other materials. The transducers are then used to characterize the composites with respect to defect detection (via Lamb wave velocity changes) and material characterization (via slowness curve inversion).
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