Abstract: A paint thickness measuring device and a computer-implemented method for measuring paint thickness using the same are provided. The paint thickness measuring device includes a first continuous-wave (cw) laser, a second continuous-wave laser, a photomixer, one or more computer processors, and a non-transitory computer-readable memory. The photomixer includes an optical coupler configured to mix laser lights emitted by the first and second continuous-wave lasers and generate a terahertz (THz) wave, a photomixer emitter configured to emit the terahertz wave, and a photomixer receiver configured to detect the terahertz wave reflected off a painted surface. The non-transitory computer-readable memory stores computer program instructions executable by the one or more computer processors to perform operations for paint thickness measurement.

Abstract: A method (10) for detecting a thermal anomaly in a composite structure (12) is provided. The method (10) includes radiatively heating (14) the composite structure (12) for a period of between about 15 seconds (s) and about 25 s, cooling (24) the heated composite structure (12), monitoring (26) temperature changes of the composite structure (12) as the composite structure (12) cools, and generating (30) a thermal image of the composite structure (12) based on the temperature changes.

Abstract: An active infrared thermography system and a computer-implemented method for generating a thermal image are provided. The active infrared thermography system includes one or more excitation sources, an infrared camera, one or more portable power sources arranged to power the one or more excitation sources and the infrared camera, and a housing, the one or more excitation sources and the one or more portable power sources being received in the housing.