Using Multifield measurements to eliminate alignment degeneracies in the JWST Testbed Telescope

機譯：使用多場測量消除JWST測試臺望遠鏡的對準退化

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The primary mirror of the James Webb Space Telescope (JWST) consists of 18 segments and is 6.6 meters in diameter. A sequence of commissioning steps is carried out at a single field point to align the segments. At that single field point, though, the segmented primary mirror can compensate for aberrations caused by misalignments of the remaining mirrors. The misalignments can be detected in the wavefronts of off-axis field points. The Multifield (MF) step in the commissioning process surveys five field points and uses a simple matrix multiplication to calculate corrected positions for the secondary and primary mirrors. A demonstration of the Multifield process was carried out on the JWST Testbed Telescope (TBT). The results show that the Multifield algorithm is capable of reducing the field dependency of the TBT to about 20 nm RMS, relative to the TBT design nominal field dependency.

機譯：詹姆斯·韋伯太空望遠鏡（JWST）的主鏡包括18個部分，直徑為6.6米。在單個現場點執行一系列調試步驟以對齊各段。但是，在該單個視場點處，分段的主鏡可以補償由于其余鏡的未對準而引起的像差?？梢栽陔x軸場點的波前檢測到未對準。調試過程中的“多場（MF）”步驟會調查五個場點，并使用簡單的矩陣乘法來計算輔助鏡和主鏡的校正位置。在JWST試驗臺望遠鏡（TBT）上進行了多場過程的演示。結果表明，相對于TBT設計標稱場相關性，多場算法能夠將TBT的場相關性降低到約20 nm RMS。

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來源
《UV/Optical/IR Space Telescopes: Innovative Technologies and Concepts III; Proceedings of SPIE-The International Society for Optical Engineering; vol.6687》|2007年|P.5.1-5.10|共10頁
會議地點 San DiegoCA(US)
作者
Erin Sabatke; Scott Acton; John Schwenker; Tim Towell; Larkin Carey; Duncan Shields; Adam Contos; Doug Leviton;
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Ball Aerospace, 1600 Commerce St., Boulder, CO 80301;

NASA Goddard Space Flight Center, Greenbelt, MD 20771;

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會議組織
原文格式 PDF
正文語種 eng
中圖分類 P111.2;
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入庫時間 2022-08-26 13:44:18

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Using Multifield measurements to eliminate alignment degeneracies in the JWST Testbed Telescope

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