Far-Infrared double-Fourier interferometers and their spectral sensitivity

Autor: Rizzo, Maxime J., Mundy, Lee G., Rinehart, Stephen A., Dhabal, Arnab, Fixsen, Dale J., Juanola-Parramon, Roser, Benford, Dominic J., Leisawitz, David T., Silverberg, Robert F., Veach, Todd J.
Rok vydání: 2015
Předmět:
Druh dokumentu: Working Paper
DOI: 10.1086/683176
Popis: Double-Fourier interferometry is the most viable path to sub-arcsecond spatial resolution for future astronomical instruments that will observe the universe at far-infrared wavelengths. The double transform spatio-spectral interferometry couples pupil plane beam combination with detector arrays to enable imaging spectroscopy of wide fields, that will be key to accomplishing top-level science goals. The wide field of view and the necessity for these instruments to fly above the opaque atmosphere create unique characteristics and requirements compared to instruments on ground-based telescopes. In this paper, we discuss some characteristics of single-baseline spatio-spectral interferometers. We investigate the impact of intensity and optical path difference noise on the interferogram and the spectral signal-to-noise ratio. We apply our findings to the special case of the Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII), a balloon payload that will be a first application of this technique at far-infrared wavelengths on a flying platform.
Databáze: arXiv