Acoustic verification of composites.(TECH SPOTLIGHT) Advanced Materials & Processes | March 1, 2007| | COPYRIGHT 2007 ASM International. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

Measurement of a polymer-based material's acoustic properties is a fast method of identification. It is quick because it requires sending only a single pulse of ultrasound into the material, a process that takes a small fraction of a second. Often the initial step in the verification of a material's identity (and sometimes the only step needed) is to find out the material's acoustic impedance. The acoustic microscope automatically determines the acoustic impedance of the material, and displays this value in units called MegaRayls. For polymer-based composites, acoustic ...

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