Fig. 1. Cylindrical line-focused Fresnel lens and its focusing spot

Fig. 2. Structural schematic of multi-line-focused Fresnel concentrator

Fig. 3. Principle of line-focused Fresnel concentrator designed by defocusing method

Fig. 4. Structural diagram of two-sided Fresnel concentrator

Fig. 5. Annular belt-type Fresnel lens

Fig. 6. Cross-section of solar photovoltaic module device

Fig. 7. Concentrating photovoltaic system using Fresnel lens and non-imaging secondary optic system

Fig. 8. Perspective view of concentrator composed of prism array

Fig. 9. Optical design of modular Fresnel lens used for collecting solar energy. (a) Optical concentration ratio; (b) direction of Fresnel lens on plane

Fig. 10. V-shaped trough solar concentrator. (a) Principle; (b) structural diagram

Fig. 11. Optical path analysis of parabolic trough concentrator

Fig. 12. Optical path of optimized trough concentrator

Fig. 13. Dish concentrator with secondary reflection

Fig. 14. Model of trough concentrator after adding cable

Fig. 15. Cross-sectional schematic of CPC

Fig. 16. Structural diagram of CPC with plate absorber

Fig. 17. Principle of parabolic trough concentrator with quadruple reflector

Fig. 18. Linear Fresnel solar reflective concentrator system with single-side planar receivers

Fig. 19. Typical schematic of linear Fresnel concentrator system

Fig. 20. Structural diagram of microarc line-focused Fresnel reflector

Fig. 21. Two adjacent parabolic reflectors and one photovoltaic cell

Fig. 22. Concentrator with secondary mirror. (a) Rotating hyperboloid secondary reflector; (b) elliptic spherical secondary reflector

Fig. 23. CAD-modal prototype design

Fig. 24. Exploded perspective view of Cassegrain-type concentrator

Fig. 25. New Cassegrain-type concentrating reflective system. (a) Principle of concentrator; (b) three-dimensional optical path

Fig. 26. General layout design of non-imaging planar concentrator

Fig. 27. Optical path of solar concentrator

Fig. 28. On-site operation of multi-planar linear combination solar concentrator

Fig. 29. Schematic of compact Fresnel concentrator

Fig. 30. Compound-eye concentrator

Fig. 31. High-power solar concentrator. (a) Light transmission; (b) three-dimensional structure

Fig. 32. Optical path of planar micro-optic solar concentrator

Fig. 33. Structural diagram of air wedge

Fig. 34. Sawtooth-shaped planar lightguide solar concentrator without light leakage

Fig. 35. Planar lightguide solar concentrator without light leakage. (a) Separate dual-parabolic concentrating module; (b) overall structural diagram of concentrator

Fig. 36. Fan-shaped lightguide solar concentrator without light leakage. (a) Structural diagram of concentrator; (b) propagation path of light in fan-shaped lightguide