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A dispersive backend design for the 'double-Fourier' interferometer BETTII
Author(s): Arnab Dhabal; Stephen A. Rinehart; John E. Mentzell; Maxime J. Rizzo; Lee Mundy; Dale Fixsen; Todd Veach; Roser Juanola-Parramon; Jordi Vila Hernandez de Lorenzo
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Paper Abstract

BETTII (Balloon Experimental Twin Telescope for Infra-red Interferometry) is designed to provide high angular resolution spectroscopic data in the far-infrared (FIR) wavelengths. The most significant limitation for BETTII is its sensitivity; obtaining spectral signal-to-noise ratio >5 in <10 minutes requires sources >13 Jy. One possible way to improve the signal-to-noise ratio (SNR) for future BETTII flights is by reducing the spectral bandwidth post beam-combination. This involves using a dispersive element to spread out a polychromatic point source PSF on the detector array, such that each pixel corresponds to a small fraction of the bandwidth. This results in a broader envelope of the interferometric fringe pattern allowing more fringes to be detected, and thereby improving the spectral SNR. Here we present the analysis and optical design of the dispersive backend, discussing the tradeoffs and how it can be combined with the existing design.

Paper Details

Date Published: 9 July 2018
PDF: 9 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107011G (9 July 2018); doi: 10.1117/12.2312138
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)
John E. Mentzell, NASA Goddard Space Flight Ctr. (United States)
Maxime J. Rizzo, NASA Goddard Space Flight Ctr. (United States)
Lee Mundy, Univ. of Maryland, College Park (United States)
Dale Fixsen, NASA Goddard Space Flight Ctr. (United States)
Todd Veach, NASA Goddard Space Flight Ctr. (United States)
Roser Juanola-Parramon, NASA Goddard Space Flight Ctr. (United States)
Jordi Vila Hernandez de Lorenzo, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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