Fig. 1. Construction principle of rotating light field. (a) Schematic diagram of spatial modulation of light intensity; (b) composite diagram of traveling wave signal

Fig. 2. Sensor output signal processing diagram

Fig. 3. Experimental platform. (a) Test platform; (b) detail of sensor prototype

Fig. 4. Experimental results of standing wave signal and traveling wave signal. (a) Standing wave signal; (b) traveling wave signal

Fig. 5. Experimental results. (a) Intra-level measurement error and harmonic component; (b) whole circle error curve

Fig. 6. Grid layout mode. (a) Whole circle uniform layout; (b) non-circular uniform layout

Fig. 7. Models of grid surface of moving disk and fixing disk. (a) 18 pairs; (b) 90 pairs

Fig. 8. Photoelectric signals, traveling wave signals and error frequency figures. (a) 18 pairs; (b) 90 pairs

Fig. 9. Physical drawing of 90 pairs of grid surfaces and experimental results. (a) Physical drawing; (b) intra-level measurement error and harmonic component

Fig. 10. Whole period error curves. (a) Whole circle uniform layout; (b) non-circular uniform layout