This course will provide a graduate-level introduction to ultrasonic devices and applications. The first portion of the course will consist of introductory lectures and the second portion will consist of presentations by the students on papers assigned by the instructor. Topics will include: waves in solids; waves in plates and at surfaces; piezoelectricity and the emission and detection of ultrasonic waves; resonators; capacitive MEMS ultrasonic transducers; surface acoustic wave devices; and possibly other related topics.