Fig. 1. Sketch map of PS-DSPI system

Fig. 2. Measured setup for PS-DSPI system

Fig. 3. Process flowchart of PS-DSPI system

Fig. 4. Original speckle images acquired by CCD at different polarization angles. (a) 0°; (b) 15°; (c) 30°; (d) 45°; (e) 60°; (f) 75°; (g) 90°; (h) 105°; (i) 120°; (j) 135°; (k) 150°; (l) 165°

Fig. 5. Schematic of polarization modulation of illuminated light

Fig. 6. Interference of object and reference light. (a) Object light is elliptically polarized; (b) object light is circularlly polarized; (c) object light is horizontally polarized; (d) object light is vertically polarized

Fig. 7. Schematic of introducing carrier-frequency using optical fiber

Fig. 8. Diagram of Fourier spectrum

Fig. 9. Phase retardation between 150° and 105°

Fig. 10. Measurement results of phase retardation. (a) Wave-filtered; (b) area unwrapping; (c) displayed in 3D

Fig. 11. Schematic of laser beam expansion

Fig. 12. Coordinate as a function of incident angle

Fig. 13. Oblique incidence pattern of light

Fig. 14. Phase retardation as a function of incident angle

Fig. 15. Fitting curves of incident angle and phase

Fig. 16. Phase comparison before and after correction