Flux Mapping the 400 m2 “Big Dish” at the Australian National University

Videographic flux mapping has been used to characterize the focal flux distribution of the 400 m{sup 2} solar concentrator located at the Australian National University. Peak fluxes in the focal region of 1.13 MW m{sup {minus}2} have been recorded, which corresponds to a concentration of 1,790 suns normalized to 1,000 W m{sup {minus}2} insolation and 100% mirror reflectivity. Comparisons with ray trace predicted fluxes incorporating surface normal errors indicates that the dish surface has a mean surface error standard deviation of 6 milliradian.