Far-Infrared Interferometric Telescope Experiment : I. Interferometer Optics
Far-Infrared Interferometric Telescope Experiment : I. Interferometer Optics
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远红外干涉望远镜实验：一、干涉仪光学
DOI：
10.2322/tstj.7.tm_47
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
F
中科院分区：
文献类型：
--
作者：
E. Kato;H. Shibai;M. Kawada;M. Narita;T. Matsuo;A. Ohkubo;Miki Suzuki;T. Kanoh;Koudai Yamamoto;F
我们研制了一种远红外干涉仪（far-infrared Interferometric Telescope Experiment: FITE）。这将是第一个在太空中工作的天文红外干涉仪。FITE是一种气球载望远镜，在平流层（35公里的高度）运行。FITE项目的目标是在100微米波长下实现1弧秒的高空间分辨率。FITE是一种迈克尔逊恒星干涉仪，通过使用四个平面反射镜，可以实现超过收集镜尺寸的长基线。第一次飞行计划于2008年11月在巴西进行，目的是以2.5角秒的空间分辨率测量干涉条纹。为了实现这一目标，两束光束的聚焦成像质量精度必须在2.5弧秒以内，光束对准精度必须在10弧秒以内，两束光束之间的光程长度精度必须在30微米以内。为了保证这些精度，望远镜的结构部件由碳纤维增强塑料制成，这种塑料具有非常低的热膨胀系数和大的杨氏模量。在对目标的观测过程中，通过三轴控制主动调整光学对准并稳定望远镜的方向。
We have developed a far-infrared interferometer (Far-Infrared Interferometric Telescope Experiment: FITE). It will be the first astronomical infrared interferometer working in space. FITE is a balloon-borne telescope, and operated in the stratosphere (the altitude of 35 km). The aim of the FITE project is to achieve a high spatial resolution of 1 arcsecond at the wavelength of 100 micrometers. FITE is a Michelson stellar interferometer, and is able to realize a long base line beyond the size of the collecting mirror by using four plane mirrors. The first flight is scheduled for November 2008 in Brazil, and the aim is to measure the interference fringes with a spatial resolution of 2.5 arcseconds. In order to achieve this, the two beams must be focused within 2.5 arcsecond accuracy in the imaging quality, within 10 arcsecond accuracy in the beam alignment and within 30 micrometers accuracy in the optical path length between the two beams. In order to archive these accuracies, the structural parts of the telescope were made of carbon-fiber reinforced plastics, which have very low thermal expansion coefficient and large Young's modulus. During observation of a target, the optical alignment is actively adjusted and the orientation of the telescope is stabilized by the three-axis control.