THz reflection imaging is a proven NDE technology for imaging sub-surface features, flaws, and defects within space flight structures such as thermal protection systems (ablative resin honeycomb, TUFI, SOFI), inflatable space habitats, composite overwrap pressure vessels, and radomes. THz NDE can detect voids, disbonds, and damage such as tearing and micro-meteorite impact. Material include Kevlar, Zylon, and other non-conductive composites. Differential THz imaging should improve the detectability of defects in each of these applications.
THz gages are used in industry to measure the thickness of multi-layer sheet materials: plastic film, insulation, foam sheets, roofing, paper, and other products that are extruded in presses. THz gauges are used to measure the thickness of aerospace coatings. The differential imaging method will improve the detectability of interfaces and delaminations in the manufacturing of these materials.