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angle of incidence |
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angle of incidence, the angle at which an ultrasound beam hits the interface between two different types of tissues, such as the facing surfaces of bone and muscle. The angle is also affected by the difference in acoustic impedance of the different tissues. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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7-11) The second, more specialized technique is an external reflection approach undertaken at grazing angle of incidence, which is often referred to as RAIRS (Reflection-Absorption Infrared Spectroscopy), (12) or some other similar acronym. It provides enough detail to allow aircraft on an airfield to be located and counted from a long stand-off range, but the grazing angle must be large enough to avoid excessive masking of features. 9 fireball entered the atmosphere at a grazing angle, it lasted long enough for people in several states to videotape it for as long as 22 seconds, Hawkes says. |
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