Fig. 1. Schematic diagram of monocular dynamic 3D active thermography system configuration

Fig. 2. (a) Scanning thermogram sequence；(b) Calibration images, position of laser in visual image and infrared thermal image；(c) Position map; (d) Algorithm flow chart of monocular dynamic 3D active thermography algorithm；(e) 3D Reconstruction； (f) Temporal alignment data；(g) 3D shape registered with aligned surface temperature series

Fig. 3. Monocular dynamic 3D active thermography experimental system

Fig. 4. (a) Standard height test block; (b) Temperature images obtained from scanning thermography; (c) Laser line position image; (d) A column of heights obtained through calibration; (e) The three-dimensional contour reconstruction results of monocular dynamic three-dimensional thermal imaging of standard height test blocks; (f) Comparison of height measurement accuracy distribution between monocular dynamic 3D active thermography(D3DAT) and Cognex DS1101; (g) Comparison of height measurement accuracy distribution between monocular dynamic 3D active thermography and Cognex DS1101

Fig. 5. (a1) Real time display of the 1000 th frame scanned; (a2) 1300 th frame; (a3) 1700 th; (b1) Time series reconstruction results at laser excitation; (b2) 30 frames later; (b3) 70 frames later; (c1) TSR detection results; (c2) FFT amplitude; (c3) FFT phase; (c4) NMF; (c5) PCA; (c6) RPHF

Table 1. Comparison with current 3D active thermography