A comparison of different correlations commonly used to describe the limb darkening effect is made. A somewhat new correlation is proposed which predicts the values to within ±1.5% of the experimental values. Using a conventional ray trace technique and assigning proper weight factors to each ray, the distribution of the local concentration ratio over a flat absorber placed in the focal plane of a cylindrical parabolic trough is also determined.
© 1985 Optical Society of America
Original Manuscript: July 23, 1984
Published: January 15, 1985
B. S. Negi, N. C. Bhowmik, S. S. Mathur, and T. C. Kandpal, "Solar limb darkening and ray trace evaluation of solar concentrators," Appl. Opt. 24, 296-298 (1985)