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160824-N-N0204-001.JPG Photo By: Daniel Parry

WASHINGTON, D.C. - Crack detection in riveted lap joints with fiber laser acoustic emission sensors: The graphic shows the initiation and growth of cracks between rivets in a lap joint in the top left. A fiber laser sensor (illustrated in the top right inset), adhered to the structures, measures the acoustic emission signals generated by the cracks and software records them as acoustic events (AE). A typical AE event is shown in the lower right plot. The amplitude of the AE events as a function of time is shown in the lower left plot. Large increases in AE event amplitude are seen when the cracks grow. (U.S. Naval Research Laboratory) RELEASED


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This photograph is considered public domain and has been cleared for release. If you would like to republish please give the photographer appropriate credit.



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