Fig. 1. Schematic diagram of polarization camera

Fig. 2. Schematic diagram of optical path

Fig. 3. Two-dimensional mismatch error diagrams. (a) Two-dimensional error comparison of isochromatic lines (φ-ε);(b) two-dimensional error comparison of isoclinic lines (θ-ε)

Fig. 4. Plots of one-dimensional mismatch error curves. (a) Error curve of stress direction with isoclinic line [θ-ε(θ)]; (b) error curve of phase retardation with isoclinic line [φ-ε(θ)]; (c) error curve of stress direction with isochromatic line [θ-ε(φ)]; (d) error curve of phase retardation with isochromatic line [φ-ε(φ)]

Fig. 5. Plot of spectral width characteristic. (a) Correspondence between wavelength and spectral width under different mismatch errors; (b) error curve under spectral width of 20 nm

Fig. 6. Simulation diagram of diameter-stressed disk. (a) Fringe pattern of isoclinic lines with error; (b) fringe pattern of isochromatic lines with error

Fig. 7. Patterns of simulated isoclinic lines. (a) Pattern of isoclinic lines after compensation; (b) pattern of isoclinic lines after separating principal stress direction

Fig. 8. Comparison of isochromatic lines before and after compensation

Fig. 9. Simulated isoclinic lines containing noise. (a) Fringe pattern of isoclinic lines with noise contamination; (b) stress direction separation pattern after compensation

Fig. 10. Disk photoelastic fringes in experiment. (a) Fringe pattern of isoclinic lines; (b) fringe pattern of isochromatic lines; (c) fringe pattern of isoclinic lines after compensation; (d) stress direction angle after removing outlier data