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The Far Ultra-Violet Imager on the Icon Mission

机译：关于图标任务的远紫紫色成像仪

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ICON Far UltraViolet (FUV) imager contributes to the ICON science objectives by providing remote sensing measurements of the daytime and nighttime atmosphere/ionosphere. During sunlit atmospheric conditions, ICON FUV images the limb altitude profile in the shortwave (SW) band at 135.6 nm and the longwave (LW) band at 157 nm perpendicular to the satellite motion to retrieve the atmospheric O/N-2 ratio. In conditions of atmospheric darkness, ICON FUV measures the 135.6 nm recombination emission of O+ ions used to compute the nighttime ionospheric altitude distribution. ICON Far UltraViolet (FUV) imager is a Czerny-Turner design Spectrographic Imager with two exit slits and corresponding back imager cameras that produce two independent images in separate wavelength bands on two detectors. All observations will be processed as limb altitude profiles. In addition, the ionospheric 135.6 nm data will be processed as longitude and latitude spatial maps to obtain images of ion distributions around regions of equatorial spread F. The ICON FUV optic axis is pointed 20 degrees below local horizontal and has a steering mirror that allows the field of view to be steered up to 30 degrees forward and aft, to keep the local magnetic meridian in the field of view. The detectors are micro channel plate (MCP) intensified FUV tubes with the phosphor fiber-optically coupled to Charge Coupled Devices (CCDs). The dual stack MCP-s amplify the photoelectron signals to overcome the CCD noise and the rapidly scanned frames are co-added to digitally create 12-second integrated images. Digital on-board signal processing is used to compensate for geometric distortion and satellite motion and to achieve data compression. The instrument was originally aligned in visible light by using a special grating and visible cameras. Final alignment, functional and environmental testing and calibration were performed in a large vacuum chamber with a UV source. The test and calibration program showed that ICON FUV meets its design requirements and is ready to be launched on the ICON spacecraft.
机译：图标远紫外线（FUV）成像仪通过提供白天和夜间气氛/电离层的遥感测量来贡献图标科学目标。在阳光照射的大气条件下，图标FUV在135.6nm的短波（SW）带中的肢体高度曲线和157nm的长波（LW）带垂直于卫星运动，以检索大气O / N-2比率。在大气黑暗的条件下，图标FUV测量用于计算夜间电离层高度分布的O +离子的135.6nm重组发射。图标远紫外线（FUV）成像仪是胫骨制型转盘设计光谱成像器，具有两个出口狭缝和相应的背像相机，在两个检测器上生成两个独立的图像中的两个独立图像。所有观察都将被处理为肢体高度概况。另外，电离层135.6nm的数据将被处理为经度和纬度空间图，以获得围绕赤道扩展区域的区域的离子分布图像。图标FUV光学轴线指向局部水平以下20度，并具有允许的转向镜视野是前向前和船尾转向30度，以保持当地磁性经络在视野中。探测器是微通道板（MCP）强化FUV管，其中磷光体光纤光纤耦合到电荷耦合器件（CCD）。双堆栈MCP-S放大光电子信号以克服CCD噪声，并且快速扫描的帧被共加入以数字地创建12秒的集成图像。数字车载信号处理用于补偿几何失真和卫星运动并实现数据压缩。该仪器最初通过使用特殊光栅和可见摄像机在可见光中对齐。在具有UV源的大型真空室中进行最终对准，功能和环境测试和校准。测试和校准程序显示图标FUV符合其设计要求，并已准备好在图标航天器上启动。

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