X射线编码孔成像技术在近地太空核爆探测中的应用

Application of X-ray Coded Aperture Imaging Technology in Near-earth Space Nuclear Explosion Detection

根据X射线编码孔成像的原理,搭建了地面模拟成像系统,在此基础上建立了编码孔成像技术探测近地太空核爆当量和方位的理论计算方法,获得了系统响应(灰度)与X射线强度、重建图像质心位置与X射线入射角度之间的关系,并开展了核爆当量和方位的模拟探测实验,对实验数据和理论计算数据进行了对比和分析。结果表明,理论计算结果与实验结果吻合较好,验证了采用X射线编码孔成像技术探测近地太空核爆的可行性,同时证明X射线编码孔成像具有较多针孔成像更高的探测灵敏度、信噪比和抗干扰能力。

According to the principle of X-ray coded aperture imaging,the ground simulation imaging system was set up.On the basis of it,the theoretical calculation method of the yield and the orientation of near-earth space nuclear explosion was established.The relationships between the system response(gray value)and the intensity of X-ray,the center of mass coordinates of the reconstruction imaging and the X-ray incidence angle were presented,and the nuclear explosion yield and orientation simulation detection experiments were carried out.The experimental results are consistent with the theoretical calculation results,so the feasibility of using X-ray coded aperture imaging technology in near-earth space nuclear explosion detection is verified.Compared with multipinhole imaging system,X-ray coded aperture imaging system has higher detectionsensitivity,signal-to-noise ratio and anti-jamming ability.