The tutorials and course materials require a username and password which can be obtained with an annual subscription fee. www.vibrationdata.com/tutorials.htm
NTIAC is a Defense Technical Information Center (DTIC) funded, Department of Defense (DoD) Information Analysis Center operated by Texas Research Institute Austin, Inc. www.ntiac.com
Illustrated narrative takes you inside the ultrasound machine and shows you how this technique is used to look inside you. www.howstuffworks.com/ultrasound.htm
5-micro-meter resolution measurement by non contact system in the air; RS-232 interface; Thickness, Deviation, Distance, Level of any kind of material. www.hedc.co.jp