Leaky-Rayleigh waves have been studied extensively at liquid-solid interface in the last 30 years [1–4]. Both leaky-Rayleigh and leaky-Lamb waves have found many application in Nondestructive Evaluation, e.g. surface defect characterization, etc [5,6]. Because of the difficulties associated with ultrasonic wave generation and detection in air in the megaHerz region air coupled non destructive evaluation has only recently been explored [7,8].
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