Fig. 1. System layout for dual-path point-diffraction interference projection testing system

Fig. 2. Schematic diagram of fiber-diffraction interference projection

Fig. 3. Systematic error distribution in surface reconstruction in simulation. (a) True tested surface; (b) Fringe pattern modulated by tested surface; (c) Reconstructed surface; (d) Residual surface error

Fig. 4. Influence of fiber core distance on surface reconstruction accuracy

Fig. 5. Influence of calibration error of fiber core distance on measurement accuracy

Fig. 6. Influence of fringe locating error on measurement accuracy

Fig. 7. Correction result of initial projection angle

Fig. 8. Measurement result of round step with fiber point-diffraction interference projection testing system

Fig. 9. Comparison of measurement results for plaster butterfly

Fig. 10. Comparison of measurement data at the trunk of the plaster butterfly