Piezoelectric transducers have a long history of applications in nondestructive evaluation of material and structure integrity owing\r\nto their ability of transformingmechanical energy to electrical energy and vice versa. As condition basedmaintenance has emerged\r\nas a valuable approach to enhancing continued aircraft airworthiness while reducing the life cycle cost, its enabling structural\r\nhealth monitoring (SHM) technologies capable of providing on-demand diagnosis of the structure without interrupting the aircraft\r\noperation are attracting increasing R&D efforts. Piezoelectric transducers play an essential role in these endeavors. This paper is\r\nset forth to review a variety of ingenious ways in which piezoelectric transducers are used in today�s SHM technologies as a means\r\nof generation and/or detection of diagnostic acoustic waves.
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