Parallel Box-Car Imaging of Adhesion Defects in Plasma-Sprayed Coatings

Thermal wave techniques have been successfully used for the characterization of adhesion defects of plasma-sprayed coatings on metal substrates. [1–3] With the advent of thermal wave infrared video imaging,[4–6] it is now possible to image large surface areas at video frame rates using an IR video camera. In this work we describe a novel parallel box-car imaging system, using an IR video camera and WSU-designed pixel by pixel time-gating and averaging and we demonstrate the ability of this system to detect adhesion defects in plasma-sprayed coatings on metal substrates. A particular advantage of our system is that the entire image can be obtain in parallel, thus making it a much faster technique than the conventional cw thermal wave imaging techniques

Parallel Box-Car Imaging of Adhesion Defects in Plasma-Sprayed Coatings

Thermal wave techniques have been successfully used for the characterization of adhesion defects of plasma-sprayed coatings on metal substrates. [1–3] With the advent of thermal wave infrared video imaging,[4–6] it is now possible to image large surface areas at video frame rates using an IR video camera. In this work we describe a novel parallel box-car imaging system, using an IR video camera and WSU-designed pixel by pixel time-gating and averaging and we demonstrate the ability of this system to detect adhesion defects in plasma-sprayed coatings on metal substrates. A particular advantage of our system is that the entire image can be obtain in parallel, thus making it a much faster technique than the conventional cw thermal wave imaging techniques.</p