Fig. 1. Normal distribution curve of energy flux density

Fig. 2. Optical path of trough concentrator system at different positions of receiver

Fig. 3. Distribution of energy flux density in condensation focal-plane

Fig. 4. Optical path of trough concentrator system when the incident angle changes

Fig. 5. Test device of energy flux density. (a) Design drawing; (b) physical map

Fig. 6. Highest energy flux density curve at different receiving positions

Fig. 7. Distribution curve of energy flux density of focal-plane at different receiving positions

Fig. 8. Acquisition factor corresponding to different receiver aperture widths

Fig. 9. Acquisition factor corresponding to different receiver positions

Fig. 10. Focal-plane energy flux distribution with different tracking errors

Fig. 11. Acquisition factor versus receiver aperture width with different tracking error angles

Fig. 12. Acquisition factor corresponding to tracking error angles