Fig. 1. Schematics of sensor structural model. (a) Schematic of sensor structure with multi-alternating light field; (b) schematic of sensor structure with single-alternating light field

Fig. 2. Schematic of area change of sinusoidal grid

Fig. 3. Principle of electric traveling wave signal synthesis of single-alternating light field sensor

Fig. 4. Matlab simulation waveform of traveling wave signal containing phase-shifting error

Fig. 5. Intensity distribution of light source. (a) Simulated spot of ideal point light source; (b) simulated spot of LED light source

Fig. 6. Matlab simulation waveform of traveling wave signal with inconsistent light-field distribution

Fig. 7. Device and experimental platform for single-alternating light field sensor

Fig. 8. Measurement error curve with phase-shifting angle of 90°. (a) Phase-shifting angle of 90°; (b) error curve of displacement measurement

Fig. 9. Measurement error curve with phase-shifting angle deviation. (a) Phase-shifting angle of 92°; (b) error curve of displacement measurement

Fig. 10. Experimental error curves of multi-alternating light field and single-alternating light field. (a) Measurement error curve of single-alternating light field; (b) measurement error curve of multi-alternating light field

Fig. 11. Light spots of different sources and distribution curves of light intensity. (a) Light spot of LED and distribution curve of light intensity; (b) laser spot and distribution curve of light intensity

Fig. 12. Measurement error curves of different light sources. (a) Measurement error curve of LED beam with scattering angle of 2°; (b) measurement error curve of laser beam

Fig. 13. Long-period error curve of single-alternating light field sensor