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24 September 2012 Fore-optics of the MUSE instrument
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Abstract
MUSE (Multi Unit Spectroscopic Explorer) is a second generation VLT panoramic integral field spectrograph developed for the European Southern Observatory (ESO), operating in the visible wavelength range (0.465-0.93 μm). The MUSE instrument is currently under integration and the commissioning is expected to start at the beginning of year 2013. The scientific and technical capabilities of MUSE are described in a series of 19 companion papers. The Fore-Optics (FO), situated at the entrance of MUSE, is used to de-rotate and provide an anamorphic magnification (x 5 / x 2.5) of the 1 arc minute square field of view from the F/15.2 VLT Nasmyth focal plane (Wide Field Mode, WFM). Additional optical elements can be inserted in the optical beam to further increase the magnification by a factor 8 (Narrow Field Mode, NFM). An atmospheric dispersion corrector is also added in the NFM. Two image stabilization units have been developed to ensure a stabilization of the field of view (1/20 of a resolved element) for each observation mode. Environmental values such as temperature and hygrometry are monitored to inform about the observation conditions. All motorized functions and sensors are remote-controlled from the VLT Software via the CAN bus with CANOpen protocol. In this paper, we describe the FO optical, mechanical and control/command electronic concept, development and performance.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
L. Parès, P. Couderc, M. Dupieux, T. Gharsa, M. Larrieu, H. Valentin, G. Gallou, R. Bacon, F. Laurent, M. Loupias, and J. Kosmalski "Fore-optics of the MUSE instrument", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84465R (24 September 2012); https://doi.org/10.1117/12.925405
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