Käufl, H. U.H. U.KäuflKerber, F.F.KerberAsmus, D.D.AsmusBaksai, P.P.BaksaiDi Lieto, N.N.Di LietoDuhoux, P.P.DuhouxHeikamp, S.S.HeikampHummel, C.C.HummelIves, D.D.IvesJakob, G.G.JakobKirchbauer, J. -P.J. -P.KirchbauerMehrgan, L.L.MehrganAL MOMANY, YAZANYAZANAL MOMANYPantin, E.E.PantinPozna, E.E.PoznaRiquelme, M.M.RiquelmeSandrock, S.S.SandrockSiebenmorgen, R.R.SiebenmorgenSmette, A.A.SmetteStegmeier, J.J.StegmeierTaylor, J.J.TaylorTristram, K.K.TristramValdes, G.G.Valdesvan den Ancker, M.M.van den AnckerWeilenmann, U.U.WeilenmannWolff, B.B.Wolff2020-04-202020-04-2020150722-6691http://hdl.handle.net/20.500.12386/24116The VLT mid-infrared imager and spectrometer VISIR returns to science operations following an extended upgrade period. Among the most important modifications are: the imaging and spectroscopic detectors have been replaced with larger AQUARIUS (1024 by 1024 pixel) detector arrays; the N-band low-resolution grating has been exchanged; and support is now provided for precipitable water vapour monitoring, in order to select the best observing conditions. The AQUARIUS detectors stem from a development for very low background applications which result in excess noise under ground-based conditions. A series of interventions was needed to find a scheme that effectively exploits these detectors for ground-based use, involving the implementation of faster chopping. VISIR has been returned to service at the VLT with enhanced capabilities.STAMPAenArticlehttps://www.eso.org/sci/publications/messenger/toc.html?v=159&m=Mar&y=15https://www.eso.org/sci/publications/messenger/archive/no.159-mar15/messenger-no159-15-18.pdf2015Msngr.159...15KFIS/05 - ASTRONOMIA E ASTROFISICA