Fig. 1. Optical path diagram of concentrated solar radiation flux measurement on curve surface

Fig. 2. Experimental device of concentrated solar flux under curve surface

Fig. 3. Physical picture of strip-like spherical crown

Fig. 4. Composite measurement curve of focal plane spatial energy flux density. (a) Composite measurement curve; (b) focal plane spot image

Fig. 5. Photograph map of spherical crown Lambert surface

Fig. 6. Photograph of 24 flat grayscale images

Fig. 7. Distribution of energy flux density of effective radiation and projected radiation. (a) Effective radiation; (b) projected radiation