Fig. 1. Principle of linear displacement measurement based on spherical light projection imaging

Fig. 2. Spherical optical magnification imaging pathway

Fig. 3. Principle of spherical light amplification

Fig. 4. Spherical light source illumination path

Fig. 5. Width encoding

Fig. 6. Decoding

Fig. 7. Positioning algorithm

Fig. 8. Subdivision algorithm

Fig. 9. Schematic of linear displacement measurement system based on spherical light projection imaging

Fig. 10. Spherical light compensation experiment light compensation stretching

Fig. 11. Decoding and subdivision experiment

Fig. 12. Discrimination testing

Fig. 13. Precision measurement experiment