Acoustic Cavitation: TU Darmstadt (Germany)
Acoustical Standards: Acoustical Society of America
BAE Systems (USA): Technical reference development and research data concerning acoustical imaging.
How Stuff Works: How Ultrasound Works: Illustrated narrative takes you inside the ultrasound machine and shows you how this technique is used to look inside you.
NDT-net (Rolf Diederichs): UT-Encyclopedia
Nondestructive Material Testing with Ultrasonics: Introduction to the Basic Principles (Krautkrämer, NDt-net)
Nondestructive Testing Information Analysis Center (NTIAC): NTIAC is a Defense Technical Information Center (DTIC) funded, Department of Defense (DoD) Information Analysis Center operated by Texas Research Institute Austin, Inc.
Super High Resolution Ultrasonic Measurement System: 5-micro-meter resolution measurement by non contact system in the air; RS-232 interface; Thickness, Deviation, Distance, Level of any kind of material.
Ultrasonics: Dedicated to the art and science of ultrasonic nondestructive testing and allied fields.
Vibrationdata.com Tutorials: The tutorials and course materials require a username and password which can be obtained with an annual subscription fee.