Optics alignment of a balloon-borne far-infrared interferometer BETTII

被引：6

作者：

Dhabal, Arnab ^{[1
,2
]}

Rinehart, Stephen A. ^{[1
]}

Rizzo, Maxime J. ^{[1
]}

Mundy, Lee ^{[2
]}

Sampler, Henry ^{[1
]}

Juanola-Parramon, Roser ^{[1
]}

Veach, Todd ^{[1
]}

Fixsen, Dale ^{[1
]}

de Lorenzo, Jordi Vila Hernandez ^{[1
]}

Silverberg, Robert F. ^{[1
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

来源：

JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS | 2017年 / 3卷 / 02期

关键词：

spatio-spectral interferometry; far-infrared; interferometric simulation; metrology; alignment; EXPERIMENTAL TWIN TELESCOPE; HIGH ANGULAR RESOLUTION;

D O I：

10.1117/1.JATIS.3.2.024002

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an 8-m baseline far-infrared (FIR: 30 -90 mu m) interferometer providing spatially resolved spectroscopy. The initial scientific focus of BETTII is on clustered star formation, but this capability likely has a much broader scientific application. One critical step in developing an interferometer, such as BETTII, is the optical alignment of the system. We discuss how we determine alignment sensitivities of different optical elements on the interferogram outputs. Accordingly, an alignment plan is executed that makes use of a laser tracker and theodolites for precise optical metrology of both the large external optics and the small optics inside the cryostat. We test our alignment on the ground by pointing BETTII to bright near-infrared sources and obtaining their images in the tracking detectors. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE).

引用

页数：15

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