Abstract
Penumbral imaging is a power imaging technique for radiations with long mean-free path. Since the reconstruction is based on deconvolution, the technique is sensitive to noise contained in penumbral images. In this article, we proposed a uniformly redundant penumbral array (URPA) technique to improve the signal-to-noise (SN) ratio of penumbral images. In URPA, the penumbral apertures are arranged in m-sequence and the SN ratio of the penumbral image can be improved by a factor of [(r×s+1)/2]1/2, where r×s is the size of two-dimensional m sequence. The effectiveness of URPA has been demonstrated by computer simulations.
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