Abstract
ABSTRACTThe Mid-Infrared Spectrometer and Imager (MIRSI) is a mid-infrared camera system built at Boston University for ground-based observing. MIRSI offers complete spectral coverage over the atmospheric windows at 8–14 and 18–26 μm for both imaging (discrete filters and a circular variable filter) and spectroscopy (in the 10 and 20 μm windows with resolutions of λ/Δλ = 200 and 100, respectively). The optical design was optimized for use at NASA’s Infrared Telescope Facility (IRTF). MIRSI utilizes a 320 × 240 pixel detector array with a plate scale of 0.27′′ pixel-1, covering a field-of-view of 86′′ × 63′′ at the IRTF. MIRSI’s optics provide diffraction-limited spatial resolution, and the instrument achieves 1 σ detection limits of 4 and 236 mJy at 10 and 21 μm, respectively, in 60 s of on-source integration time.
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