A heuristic penumbral imaging technique for measurements of laser-produced plasma density profile

Abstract

Penumbral imaging is a powerful technique for imaging of penetrating radiations such as neutrons and hard x ray with a high spatial resolution. Recently, the technique has also been used for measurement of laser-produced plasma density profile. The limitation is that the straightforward image or signal reconstruction will introduce a significant distortion if the penumbral image is distorted by the noise. In this article, we propose a heuristic method for reconstruction of penumbral images. Both simulation and experimental results demonstrated that the proposed method is robust and tolerant to the noise.