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UT Testing-Section 2 Physics of Ultrasound

UT Testing-Section 2 Physics of Ultrasound

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Since the amount <strong>of</strong> reflected energy plus the transmitted energy must equal<br />

the total amount <strong>of</strong> incident energy, the transmission coefficient is calculated<br />

by simply subtracting the reflection coefficient from one.<br />

Formulations for acoustic reflection and transmission coefficients (pressure)<br />

are shown in the interactive applet below. Different materials may be<br />

selected or the material velocity and density may be altered to change the<br />

acoustic impedance <strong>of</strong> one or both materials. The red arrow represents<br />

reflected sound and the blue arrow represents transmitted sound.<br />

http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/<strong>Physics</strong>/applet_2_7/applet_2_7.htm

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