My note: Thanks for bringing this recent contract to my attention to IV poster
Terahertz Imaging for Detection of Corrosion and Defects Under Hull Coatings
In this Phase I SBIR project we propose to demonstrate the key elements of a practical, field-deployable non-contact time-domain terahertz (TD-THz) system for rapid detection of submarine hull defects such as corrosion and gouges hidden beneath acoustic hull coatings, hull coating material defects, and hull coating adhesion defects. The key feasibility areas addressed will be developing the high-resolution focusing system required for the high contrast detection of flaws on the hull-coating interface buried several inches beneath the surface; and utilizing this focusing lens assembly in a novel TD-THz scanner system which can rapidly image large areas of a submarine hull in a shipyard environment. TD-THz is a non-contact imaging method which has been shown to detect corrosion and volume defects. The ultra-wideband pulsed TD-THz reflection tomography method allows in-situ inspection through hull coatings, since these polymeric coatings transmit in the THz band. The TD-THz pulse reflections can be focused and collected with high numerical aperture lenses, and time-gated at the buried hull-coating interface for precise, high contrast 3D-layer sub-surface imaging
Benefit
Upon successful completion of the Phase I and Phase II project, the proposed TD-THz inspection system will provide the Navy with a novel method of imaging submarine hull coatings and the underlying hull for hull corrosion, coating material defects, and coating adhesion defects.
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