Author Affiliations
Abstract
1 Shaanxi Key Laboratory of Optical Information Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
2 State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China
3 Department of Electronic Information Engineering, Nanchang University, Nanchang 330031, China
We present the spatial resolution estimation methods for a photon counting system with a Vernier anode. A limiting resolution model is provided according to discussions of surface encoding structure and quantized noise. The limiting resolution of a Vernier anode is revealed to be significantly higher than that of a microchannel plate. The relationship between the actual spatial resolution and equivalent noise charge of a detector is established by noise analysis and photon position reconstruction. The theoretical results are demonstrated to be in good agreement with the experimental results for a 1.2 mm pitch Vernier anode.
110.3010 Image reconstruction techniques 030.5260 Photon counting 040.7480 X-rays, soft x-rays, extreme ultraviolet (EUV) Chinese Optics Letters
2016, 14(12): 121102
1 中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室, 陕西 西安 710119
2 中国科学院研究生院, 北京 100049
论述了X射线脉冲星辐射光子探测与累积脉冲轮廓构造模型，分析了通过光子计数获取的累积脉冲轮廓的噪声特点，提出了基于非归一化Haar小波的消噪算法，推导了基于Haar小波消噪的阈值函数的最佳参数计算公式。在X射线脉冲星导航地面模拟系统上进行了实验研究，结果表明，消噪后的累积脉冲轮廓峰值信噪比提高2 dB以上。通过蒙特卡罗模拟分析，证实消噪后的累积脉冲轮廓有助于提高脉冲到达时间的测量精度。
测量 脉冲星导航 脉冲轮廓 泊松分布 峰值信噪比 Haar小波
