- 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.
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