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首页> 外文会议>Proceedings of the 5th international conference on space optics (ICSO 2004) >SEARCH FOR EXTRATERRESTRIAL PLANETS: THE DARWIN MISSION
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SEARCH FOR EXTRATERRESTRIAL PLANETS: THE DARWIN MISSION

机译：寻找地外行星：达尔文任务

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摘要

The DARWIN mission is primarily devoted to therndetection of earth-like exoplanets and the spectroscopicrncharacterization of their atmospheres for key tracers ofrnlife. We will review the current instrumental concept,rnwhich is based on an interferometric array of six freeflyingrntelescopes, passively cooled to 40 K, operatingrnin the 6-18 micron wavelength range. The angularrnresolution of DARWIN can be matched to a broadrnvariety of observational scenarios by resizing the arrayrnbetween diameters of 50 m and 500 m. The flux of thernparent star, which normally would overwhelm thernplanetary signal, is suppressed by a factor of 10~6 byrndestructive interference (nulling) over the full opticalrnbandwidth, as the beams are combined. Then, thernplanetary signal can be separated from the zodiacalrnbackground signature by modulating the opticalrnresponse of the interferometer.rnESA is carrying out an extensive technologyrndevelopment programme to bring DARWIN-relatedrntechnology to a maturity level in the three key areas ofrnFormation Flying, Cryogenic Cooling andrnMechanisms, and Nulling Interferometry. We report onrnthe current status of optical development activitiesrnwithin this program, which includes the developmentrnof optical metrology, achromatic phase shifters,rnamplitude and polarization control devices, nullingrninterferometer demonstrators, mid-IR single-modernwaveguides and advanced waveguide coupling devices.
机译：DARWIN任务主要致力于对地球状系外行星的探测，以及对大气层进行关键光谱示踪的光谱表征。我们将回顾当前的仪器概念，它基于六个自由飞行式望远镜的干涉阵列，被动式冷却到40 K，工作在6-18微米波长范围内。通过调整直径在50 m和500 m之间的数组的大小，可以将DARWIN的角度分辨率与各种观察场景相匹配。当合并光束时，通常会压倒行星信号的近星恒星通量在整个光带宽上被破坏性干扰（消零）抑制了10到6倍。然后，通过调制干涉仪的光学响应，可以将行星信号与黄道带背景特征分离。ESA正在实施一项广泛的技术开发计划，以将DARWIN相关技术的成熟度提高到三个关键领域，即“形成飞行”，“低温冷却”和“消除机理”以及干涉仪。我们将在此程序中报告光学开发活动的当前状况，包括光学测量的发展，消色差移相器，幅度和偏振控制设备，干涉仪演示器，中红外单现代波导和先进的波导耦合设备。

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