单一视角X射线分幅变像管设计

发布时间：2018-07-12 20:18

本文选题：光学器件 + 分幅相机　；参考：《光学学报》2017年05期

【摘要】：针对传统X射线快门选通微通道板(MCP)分幅相机利用针孔阵列获取目标图像时视角不一致的问题,提出一种单一视角X射线变像管分幅方法。利用电子束团在电子光学交叉点所携带信息的全息性和可分割性,设计了一种单一视角多幅输出图像的静电聚焦变像管,输出端配接MCP分幅单元以实现图像选通和增强功能。与传统门控MCP分幅管相比,其既能实现图像视角的同一性,又可以避免直穿光激发荧光屏对输出图像的影响,具有更高的信噪比。所设计的分幅变像管阴极有效工作直径为40mm,输出荧光屏直径为40mm,放大倍率为1.29,中心理论空间分辨率达到60lp/mm,边缘空间分辨率达到26lp/mm,分幅曝光时间特性由快门选通MCP分幅单元的选通脉宽决定。该方法为实现X射线分幅相机视角同一性给出了一条有效途径。
[Abstract]:In order to solve the problem that the traditional X-ray shutter gated microchannel plate (MCP) splitter camera uses pinhole array to obtain the target image, a single angle X ray image changing tube method is proposed. Based on the holography and separability of the information carried by the electron beam cluster at the electron-optical intersection, an electrostatic focusing variable image tube with a single view angle and multiple output images is designed. The output end is matched with MCP splitter to realize the function of image gating and enhancement. Compared with the traditional gated MCP splitter, it can not only realize the identity of the image angle, but also avoid the influence of the direct light excitation screen on the output image. It has a higher signal-to-noise ratio (SNR). The effective working diameter of the cathode is 40 mm, the output screen diameter is 40 mm, the magnification is 1.29, the center theoretical spatial resolution is 60 LP / mm, the edge spatial resolution is 26 LP / mm, and the splitter exposure time characteristic is switched through MCP by the shutter. The strobe width of the splitter unit is determined. This method provides an effective way to realize the angle identity of X-ray splitter camera.
【作者单位】：深圳大学光电子器件与系统教育部/广东省重点实验室;深圳大学信息工程学院;
【基金】：国家重大科学仪器设备开发专项(2014YQ230659)
【分类号】：TN143

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