Fig. 1. Diagram of principle of light field sub-aperture imaging

Fig. 2. Diagram of principle of light field tomographic PIV

Fig. 3. PINN structure combined with N-S equations

Fig. 4. Schematic diagram of principle of PINN-PIV fusion model

Fig. 5. Loss function variation graph

Fig. 6. Light field images and corresponding reconstructed particle field. (a) Light field image at t₁; (b) light field image at t₂; (c) particle field distribution at t₁ after reconstruction; (d) particle field distribution at t₂ after reconstruction

Fig. 7. Comparison of three-dimensional flow fields of Gaussian vortex ring (w component of z=5 section, w components of yz plane and xz plane, and bulk velocity distribution of three-dimensional measurement). (a) Standard vortex ring displacement fields; (b) only cross-correlation vortex ring displacement fields; (c) reconstruction and cross-correlation vortex ring displacement fields; (d) PINN predicted vortex ring displacement fields

Fig. 8. Schematic diagram of high-resolution light field PIV three-dimensional flow measurement system

Fig. 9. Schematic diagram of PIV imaging of flow around cylinder

Fig. 10. Comparison of prediction results of flow around cylinder. (a) Experimental data of flow around cylinder (70 L/h); (b) prediction results of PINN-PIV fusion model (70 L/h); (c) experimental data of flow around cylinder (98 L/h); (d) prediction results of PINN-PIV fusion model (98 L/h)