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- W2848437927 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 greater than 5 in less than 10 minutes requires sources greater than 13 Janskys (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 (Point Spread Function) 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." @default.
- W2848437927 created "2018-07-19" @default.
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- W2848437927 date "2018-07-09" @default.
- W2848437927 modified "2023-09-27" @default.
- W2848437927 title "A dispersive backend design for the 'double-Fourier' interferometer BETTII" @default.
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- W2848437927 doi "https://doi.org/10.1117/12.2312138" @default.
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