Abstract
In order to realize a high conversion efficiency of solar to electric power, a novel emitter with a high solar power absorption should be developed. According to our previous paper in which an effective solar power absorption co-efficiency α is numerically calculated, the equipment with the light trap is found most effective to improve α of the emitter. In the present work, several emitters with different structures have been heated by condensed solar light and α has been estimated by comparing experimental emitter temperature with numerically calculated one. As a result, it is verified that α is improved from 0.25 to 0.7 by the light trap. However, it is found that the effect of the light trap is suppressed when the emitter is smaller than the area focused by the lens.
