Fig. 1. Schematic diagram of three-dimensional shape measurement of composite surface

Fig. 2. Geometry of the composite surface DPMD measurement

Fig. 3. Acquisition model

Fig. 4. Specular fringe image obtained by simulation. (a) Reference surface; (b) measured surface; (c) reference surface collected by camera; (d) measured surface collected by camera

Fig. 5. Diffuse fringe image obtained by simulation. (a) Reference surface; (b) measured surface; (c) reference surface collected by camera; (d) measured surface collected by camera

Fig. 6. Height and error distribution of the composite surface. (a) Height; (b) error distribution

Fig. 7. Effect of system parameters on RMS. (a) Δd; (b) d; (c) P; (d) θ; (e) α

Fig. 8. Measuring system of composite surface

Fig. 9. Effect of actual measurement system parameters on RMS. (a) Δd; (b) d; (c) P; (d) θ; (e) α

Fig. 10. Three-dimensional reconstruction result of composite surface. (a) Tested composite steps; (b) fringe pattern of position1; (c) height map