Azuma R, Nozaki S, Fujioka S, Chen Y W, Namihira Y
Transdisciplinary Research Organization for Subtropics and Island Studies, University of the Ryukyus, Okinawa 903-0213, Japan.
Rev Sci Instrum. 2010 Oct;81(10):10E517. doi: 10.1063/1.3483211.
Penumbral imaging is a technique which uses the fact that spatial information can be recovered from the shadow or penumbra that an unknown source casts through a simple large circular aperture. The size of the penumbral image on the detector can be mathematically determined as its aperture size, object size, and magnification. Conventional reconstruction methods are very sensitive to noise. On the other hand, the heuristic reconstruction method is very tolerant of noise. However, the aperture size influences the accuracy and resolution of the reconstructed image. In this article, we propose the optimization of the aperture size for the neutron penumbral imaging.
空间信息可以从未知源通过一个简单的大圆形孔径投射的阴影或半影中恢复。探测器上半影图像的大小可以通过数学方法确定为其孔径大小、物体大小和放大倍数。传统的重建方法对噪声非常敏感。另一方面，启发式重建方法对噪声的容忍度很高。然而，孔径大小会影响重建图像的准确性和分辨率。在本文中，我们提出了中子半影成像孔径大小的优化方法。
