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- W2086947380 abstract "Here we present the optical and limited cryogenic design for The Balloon Experimental Twin Telescope for Infrared Interferometry (BETTII), an 8-meter far-infrared interferometer designed to fly on a high-altitude scientific balloon. The optical design is separated into warm and cold optics with the cold optics further separated into the far-infrared (FIR) (30-90 microns) and near-infrared (NIR) (1-3 microns). The warm optics are comprised of the twin siderostats, twin telescopes, K-mirror, and warm delay line. The cold optics are comprised of the cold delay line and the transfer optics to the FIR science detector array and the NIR steering array. The field of view of the interferometer is 2’, with a wavelength range of 30-90 microns, 0.5” spectral resolution at 40 microns, R~200 spectral resolution, and 1.5” pointing stability. We also present the design of the cryogenic system necessary for operation of the NIR and FIR detectors. The cryogenic system consists of a ‘Buffered He-7’ type cryogenic cooler providing a cold stage base temperature of < 280mK and 10 micro-Watts of heat lift and a custom in-house designed dewar that nominally provides sufficient hold time for the duration of the BETTII flight (24 hours)." @default.
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- W2086947380 date "2014-07-24" @default.
- W2086947380 modified "2023-09-23" @default.
- W2086947380 title "The balloon experimental twin telescope for infrared interferometry (BETTII): optical design" @default.
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- W2086947380 doi "https://doi.org/10.1117/12.2055659" @default.
- W2086947380 hasPublicationYear "2014" @default.
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