Paper
6 July 2018 Veloce environmental control system
Gaston Gausachs, Robert Boz, Tom Carkic, Michael Ellis, James Gilbert, Nicholas Herrald, Michael Ireland, Ellie O'Brien, Ian Price, Matthew Robertson, Colin Vest
Author Affiliations +
Abstract
Veloce is an ultra-stabilized Echelle spectrograph for precision radial velocity measurements of stars. In order to maximize the grating performance, the air temperature as well as the air pressure surrounding it must be maintained within tight tolerances. The control goal was set at +/-10 mK and +/-1 mbar for air temperature and pressure respectively. The strategy developed by the design team resulted in separate approaches for each of the two requirements. A constrained budget early in the concept phase quickly ruled out building a large vacuum vessel to achieve stable air pressure. Instead, a simplified approach making use of a slightly over pressurized enclosure containing the whole spectrograph was selected in conjunction with a commercially available pressure controller. The temperature stability of Veloce is maintained through a custom array of PID controlled heaters placed on the outer skin of the internal spectrograph enclosure. This enclosure is also fully lined with 19 mm thick insulating panels to minimize the thermal fluctuations. A second insulated enclosure, built around the internal one, adds a layer of conditioned air to further shield Veloce from the ambient thermal changes. Early success of the environment control system has already been demonstrated in the integration laboratory, achieving results that amply exceed the goals set forth. Results presented show the long term stability of operation under varying barometric conditions. This paper details the various challenges encountered during the implementation of the stated designs, with an emphasis on the control strategy and the mechanical constraints to implement the solutions.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gaston Gausachs, Robert Boz, Tom Carkic, Michael Ellis, James Gilbert, Nicholas Herrald, Michael Ireland, Ellie O'Brien, Ian Price, Matthew Robertson, and Colin Vest "Veloce environmental control system ", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107026J (6 July 2018); https://doi.org/10.1117/12.2313162
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KEYWORDS
Spectrographs

Control systems

Optical benches

Control systems design

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