子午型龙虾眼透镜较方孔型龙虾眼透镜具有更好的聚焦能力,为了研究子午型龙虾眼透镜反射表面的特征对X射线聚焦成像特性的影响,基于棱镜展开原理,建立了子午型龙虾眼透镜的光线追迹算法,并基于菲涅耳反射原理,分析了膜层材料、膜层厚度及膜层表面粗糙度对不同能量X射线聚焦特性的影响。研究结果表明,子午型龙虾眼透镜对X射线的聚焦能力主要取决于反射表面的传递效率,传递效率由选用的膜层厚度与粗糙度决定,同时受到通道锥顶角的调制。同时,X射线的能量决定了子午型龙虾眼透镜的有效物方孔径角,透镜视场与有效物方孔径角的匹配也会影响子午型龙虾眼透镜的聚焦能力和焦斑分布。

The meridional lobster-eye lens has a better focusing ability than the square-channel lobster-eye lens. In order to study the influence of the characteristics of the reflective surface of the meridional lobster-eye lens on the X-ray focusing imaging characteristics, one ray tracing algorithm for the meridional lobster-eye lens is established based on the principle of prism expansion. In addition, the effects of coating material, coating thickness and surface roughness on the focusing characteristics of X-rays with different energies are analyzed based on the Fresnel reflection principle. The research results show that the X-ray focusing ability of the meridional lobster-eye lens is mainly determined by the transfer efficiency of the reflective surface, and the transfer efficiency is determined by the chosen coating thickness and coating roughness and simultaneously modulated by the channel-cone apex angle. The X-ray energy determines the effective object aperture angle of the meridional lobster eye lens, and the matching of the lens field of view with the effective object aperture angle also influences its focusing ability and focal spot distribution.