Fig. 1. Scheme of virtual beam method

Fig. 2. Reconstruction flowchart of the combustion field

Fig. 3. Bimodal original model
(a): Temperature distribution model; (b): Concentration distribution model

Fig. 4. Schematic diagram of beam arrangement
(a): Mode A; (b): Mode B; (c): Mode C; (d): Mode D

Fig. 5. Reconstruction error for different beam arrangements

Fig. 6. Variation trend of Reconstruction error
(a): E_x variation for reprojection number;(b): E_t variation for reprojection number

Fig. 7. Reconstruction temperature field for different algorithms
(a): ART witi smoothing mechanism;(b): Virtual beam and re-projection method

Fig. 8. Reconstruction result for bimodal combustion field
(a): Reconstruction temperature field;(b): Reconstruction concentration field

Fig. 9. Variation trend of Reconstruction error with 0.5% noise

Fig. 10. Effect of random noise on reconstruction error

Fig. 11. Multimodal temperature distribution model

Fig. 12. Multimodal temperature reconstruction results