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NDE Imaging of Time Differential Terahertz WavesNatural voids are present in the vicinity of a conathane interface that bonds two different foam materials. These voids are out of focus with the terahertz imaging system and multiple optical reflections also make it difficult to determine their depths. However, waves passing through the top foam article at normal incidence are partially reflected at the denser conathane layer prior to total reflection at the tank s wall. Reflections embedded in the oscillating noise segment prior to the main signals can be extracted with dual applications of filtering and time derivative. Void's depth is computed from direct path's time of flight.
Document ID
20080033029
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Trinh, Long B.
(Lockheed Martin Space Systems Co. New Orleans, LA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2008
Subject Category
Quality Assurance And Reliability
Funding Number(s)
CONTRACT_GRANT: NAS8-00016
Distribution Limits
Public
Copyright
Other

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