Asylum Research

Galleries | Polymers | Polymers



AM-FM of Packaging Material

AM-FM image of a commercial coffee packaging bag.  A piece of  the bag was first coated with a thin layer (about 0.5 mm) of epoxy and the cross-section was cut with a Leica microtome at -160°C, 1 mm/sec with a diamond knife. The bright yellow band shows the aluminum layer attached to two vapor barrier layers (orange layers) by a “tie” layer (dark purple). The resonance frequency shifts range ~2kHz around the second mode resonance of ~1.8MHz.  30µm scan.


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