Ground and Space-Based Telescopes

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

[+] Author Affiliations
Arnab Dhabal

NASA Goddard Space Flight Center, Greenbelt, Maryland, United States

University of Maryland, Department of Astronomy, College Park, Maryland, United States

Stephen A. Rinehart, Maxime J. Rizzo, Henry Sampler, Roser Juanola-Parramon, Todd Veach, Dale Fixsen, Jordi Vila Hernandez de Lorenzo, Robert F. Silverberg

NASA Goddard Space Flight Center, Greenbelt, Maryland, United States

Lee Mundy

University of Maryland, Department of Astronomy, College Park, Maryland, United States

J. Astron. Telesc. Instrum. Syst. 3(2), 024002 (Apr 12, 2017). doi:10.1117/1.JATIS.3.2.024002
History: Received January 20, 2017; Accepted March 27, 2017
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Abstract.  The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an 8-m baseline far-infrared (FIR: 3090  μm) 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.

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© 2017 Society of Photo-Optical Instrumentation Engineers

Citation

Arnab Dhabal ; Stephen A. Rinehart ; Maxime J. Rizzo ; Lee Mundy ; Henry Sampler, et al.
"Optics alignment of a balloon-borne far-infrared interferometer BETTII", J. Astron. Telesc. Instrum. Syst. 3(2), 024002 (Apr 12, 2017). ; http://dx.doi.org/10.1117/1.JATIS.3.2.024002


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