Yanjie Wei, Yao Xiao. Processing Method of Infrared Sequence Images Based on Long Pulse Thermal Excitation[J]. Acta Optica Sinica, 2024, 44(8): 0812001
- Acta Optica Sinica
- Vol. 44, Issue 8, 0812001 (2024)
Fig. 1. Acquisition and DFT of infrared image sequence by infrared detector after long pulse thermal wave excitation
Fig. 2. Schematic of panel with internal defects at different depths
Fig. 3. Simulation test results. (a) Phase data and reference phase data at corresponding points; (b) curve of phase difference at each point and corresponding integrated regions
Fig. 4. Flow chart of image sequence processing method for long pulse thermography
Fig. 5. GFRP sample. (a) Schematic of defect distribution in GFRP panel; (b) front and rear surfaces of sample
Fig. 6. Self-developed infrared non-destructive testing system
Fig. 7. Raw thermal images captured at different times. (a) 5 s; (b) 15 s; (c) 25 s
Fig. 8. Test results of GFRP sample. (a) Phase curves; (b) phase difference curves
Fig. 9. Phase images at different frequencies. (a) 0.019 Hz; (b) 0.039 Hz; (c) 0.078 Hz; (d) phase integrated image
Fig. 10. Images for size measurement of defects. (a) Image segmentation; (b) edge extraction
Fig. 11. Detection results with different algorithms. (a) ATC; (b) TSR; (c) PCA; (d) proposed method
Fig. 12. Quantitative evaluation of different algorithms. (a) Absolute grayscale difference profiles in horizontal line of defects; (b) SNR
Fig. 13. Test results of defective and sound regions. (a) Variation of temperature difference with time; (b) variation of RSN with sampling frequency
Fig. 14. Detection results at different sampling frequencies. (a) 1 Hz; (b) 5 Hz; (c) 10 Hz; (d) 30 Hz
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Table 1. Measurement results of defect size
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