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首页> 外文会议>Optical Systems Degradation, Contamination, and Stray Light: Effects, Measurements, and Control II >New Horizons Pluto lessons learned during ground processing
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New Horizons Pluto lessons learned during ground processing

机译：地面处理过程中吸取的新视野冥王星课程

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The New Horizons (NH) Pluto probe was launched on an Atlas V-551 equipped with a five-meter payload fairing (PLF). In-situ Gel-Pak~® witness plates were used to monitor fall-out at spacecraft level and at Centaur level within the PLF. Based upon the composition of particles captured on a Gel-Pak~® that witnessed encapsulation and transport to the launch facility significant particle fall-out is associated with fairing materials of construction. The weekly variation of particle fall-out onto subsequent Gel-Pak~® surfaces over the course of launch preparation indicates that upward transport of particles occurred. Based upon the sum of all Gel-Pak~® particle counts combined with visual detection of dust on the top deck of New Horizons during installation of the radioisotope thermoelectric generator (RTG) our goal of level 450 beginning of life (BOL) was probably exceeded. A big contributor to this excedance was removal of the isolation diaphragm that normally separates the spacecraft from activity below due to mission unique requirements. The launch service provider confirmed detection of upward air movement in previous ground testing of an Atlas V fairing. Future contamination sensitive missions using the Atlas V may want to consider the following: 1) reduced PLF airflow (NH used 280 Lbm/min.), 2) ultraviolet inspection of the PLF, 3) use of isolation diaphragm, 4) in-situ particle counting. Sodium chloride was evident on many particles examined by SEM/EDS, indicating intrusion of the sea coast atmosphere into KSC cleanrooms.
机译：New Horizo​​ns（NH）冥王星探测器是在装有五米有效载荷整流罩（PLF）的Atlas V-551上发射的。原位Gel-Pak〜®见证板用于监测PLF中航天器水平和半人马座水平的掉落。基于捕获到的胶体颗粒的组成，该胶体见证了封装和运输到发射设施的情况，显着的颗粒脱落与结构整流罩材料有关。在发射准备过程中，每周在后续的Gel-Pak®表面上掉落的颗粒的每周变化表明发生了颗粒的向上运输。根据所有Gel-Pak〜®颗粒计数的总和，加上在放射性同位素热电发生器（RTG）安装过程中目视检测到的新视野顶层甲板上的灰尘，我们可能已超过了450寿命初期（BOL）的目标。造成这种现象的一个重要原因是，由于任务的独特要求，拆除了通常使航天器与下面的活动分离的隔离膜。发射服务提供商在先前对Atlas V整流罩的地面测试中确认检测到向上空气流动。未来使用Atlas V进行对污染敏感的任务时，可能需要考虑以下因素：1）减少PLF气流（使用的NH为280 Lbm / min。），2）对PLF进行紫外线检查，3）使用隔离膜片，4）原位粒子计数。在通过SEM / EDS检查的许多颗粒上明显可见氯化钠，表明沿海大气侵入KSC洁净室。

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