A prototype handheld time-domain terahertz reflection sensor for measuring and mapping the thickness ofthermal barrier coatings (TBCs) applied to high temperature exhaust components will be built and tested.The prototype will consist of a Class I Div. 2 certified handheld sensor connected with a lightweight umbilical to the THz control unit.All typical operator functions will be able to be performed through the handheld unit, automating and simplifying the setup process compared with the Phase 1 testing.The prototype will be able to scan any 12 in. sq. area of the tailpipe, including tightly curved areas at 0.1 in. resolution in < 1minute. The sensor will track position allowing 1D or 2D thickness mapping. No data at militarily significant microwave frequencies will be used or collected.
