Physical acoustics. Principles and methods / Физическая акустика. Принципы и методы

The field of ultrasonics is a branch of acoustics dealing with frequencies generally beyond the audible limit. As such, the application of the principles of classical acoustics serves equally well in the audible and ultrasonic regimes. However, as noted by Hubbard (1940), “While it is a logical extension of well-known principles, its growth has been signalized by the discovery of phenomena peculiar to the new ranges of frequency.” It is the research, development and use of the “peculiar phenomena” that has created the very broad field of ultrasonics. The objective of this work will be to review the history of that field. <...>