Abstract
The evaluation of an object’s 3D shape change during ablation in wind tunnel testing is critical for the optimization of the thermal protection system. However, strong thermal radiation and a harsh environment cause challenges to the traditional measurement methods. A single camera digital micro-mirror device (DMD) projector-structured laser light system is proposed for in-situ 3D shape measurement in a wind tunnel test. A customized DMD combined with a laser source is devised for projecting concentrated full-field high-power structured light stripes. To filter laser speckle noise in projected chessboard images for model calibration, an auto-window Kuwahara adaptive filter is put forward. The 3D shape of a blunt-head cylinder was in-situ measured in a plasma wind tunnel which reached a maximum temperature of 1950 °C. The diameter reconstruction error was within 0.85% (0.17/20.03 mm). With projected laser light and multi-step filters, the ablation process of the front face of a dome-top cylinder at 1950 °C was clearly observed at a long working distance over 1.5 m.
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