A dispersive backend design for the 'double-Fourier' interferometer BETTII

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

doi:10.1117/12.2312138

9 July 2018 A dispersive backend design for the 'double-Fourier' interferometer BETTII

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

Author Affiliations +

Proceedings Volume 10701, Optical and Infrared Interferometry and Imaging VI; 107011G (2018) https://doi.org/10.1117/12.2312138
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Conference Presentation

Citation Download Citation

Arnab Dhabal, Stephen A. Rinehart, John E. Mentzell, Maxime J. Rizzo, Lee Mundy, Dale Fixsen, Todd Veach, Roser Juanola-Parramon, and Jordi Vila Hernandez de Lorenzo "A dispersive backend design for the 'double-Fourier' interferometer BETTII", Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 107011G (9 July 2018); https://doi.org/10.1117/12.2312138

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