The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII) is an eight-meter baseline Michelson interferometer designed to fly on a high-altitude balloon. The long baseline, in combination with a double-Fourier Michelson interferometer, provides high angular resolution (~0.5″) in the 30–90μm band with spectral resolution of up to R ≡ λ/Δλ ~ 200. The capabilities provided by the double-Fourier instrument therefore allow BETTII to provide spatially-resolved spectroscopy, which will in turn enable exploration of important astrophysical regimes that are hidden from the view of current instrumentation.

© 2013 Optical Society of America

PDF Article  |   Presentation Video


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription

Presentation Video

Videos freely accessible in 2020 and available to subscribers starting in 2021.