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Journal of Astronomical Telescopes, Instruments, and Systems

Optics alignment of a balloon-borne far-infrared interferometer BETTII
Author(s): Arnab Dhabal; Stephen A. Rinehart; Maxime Rizzo; Lee G. Mundy; Henry P. Sampler; Roser Juanola-Parramon; Todd J. Veach; Dale J. Fixsen; Jordi Vila Hernandez de Lorenzo; Robert F. F. Silverberg
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Paper Abstract

The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an 8-m baseline far-infrared (FIR: 30 90    μ 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.

Paper Details

Date Published: 12 April 2017
PDF: 15 pages
J. Astron. Telesc. Instrum. Syst. 3(2) 024002 doi: 10.1117/1.JATIS.3.2.024002
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 3, Issue 2
Show Author Affiliations
Arnab Dhabal, NASA Goddard Space Flight Ctr. (United States)
Univ. of Maryland, College Park (United States)
Stephen A. Rinehart, NASA Goddard Space Flight Ctr. (United States)
Maxime Rizzo, NASA Goddard Space Flight Ctr. (United States)
Lee G. Mundy, Univ. of Maryland, College Park (United States)
Henry P. Sampler, NASA Goddard Space Flight Ctr. (United States)
Roser Juanola-Parramon, NASA Goddard Space Flight Ctr. (United States)
Todd J. Veach, NASA Goddard Space Flight Ctr. (United States)
Dale J. Fixsen, NASA Goddard Space Flight Ctr. (United States)
Jordi Vila Hernandez de Lorenzo, NASA Goddard Space Flight Ctr. (United States)
Robert F. F. Silverberg, NASA Goddard Space Flight Ctr. (United States)


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