Fig. 1. Schematic of generation principle for polarized transmission structured light

Fig. 2. Schematic of detection principle for polarized transmission structured light

Fig. 3. Schematic diagram of ray deflect for defect detection

Fig. 4. System installation diagram

Fig. 5. Relationships between polarizer and original result. (a) Result with polarizer; (b) result without polarizer; (c) comparison of the two results

Fig. 6. Experimental results. (a) Binarization of dusts; (b) binarization of modulation result; (c) overlap data of Fig.6(a) and Fig.6(b); (d) defect distribution result after dust removal

Fig. 7. Experimental results of the plate glass in the reflected structured light and the polarized transmission structured light. (a) Polarized transmission structured light; (b) reflected structured light; (c) comparison of fringe quality; (d) comparison of results for the vertical line part in Fig.7(a) and Fig.7(b)

Fig. 8. Test experiment of optical lens for reflected structured light and polarized transmission structured light. (a) Fringe pattern of reflected structured light; (b) fringe pattern of polarized transmission structured light; (c) comparison of fringe quality for two methods

Fig. 9. Modulation results of optical lens detection experiment for reflected structured light and polarized transmission structured light. (a) Reflected structured light; (b) polarized transmission structured light

Fig. 10. Experimental results of pitting defect detection on lens surface. (a) Original result of modulation detection; (b) binarization of dust distribution; (c) binarization of original result; (d) overlap data of Fig.10(b) and Fig.10(c); (e) defect distribution results after dust removal

Fig. 11. Standard comparison board for surface scratches

Fig. 12. Detection result of the standard comparison board for surface scratches using the polarized transmission structured light system