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Proceedings Paper

Control system architecture of QUIJOTE multi-frequency instrument
Author(s): María F. Gómez-Reñasco; Marta Aguiar; José Miguel Herreros; Roger J. Hoyland; Vicente Sánchez de la Rosa; Afrodisio Vega-Moreno; Teodora Viera-Curbelo; Ricardo Génova-Santos; Carlos López-Caraballo; Rafael Rebolo; Jose Alberto Rubiño-Martín
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Paper Abstract

The QUIJOTE-CMB experiment has been described in previous publications. Here we describe the architecture of the control system, hardware and software, of the QUIJOTE I instrument (MFI). It is a multi-channel instrument with five separate polarimeters: two of which operate at 10-14 GHz, two of which operate at 16-20 GHz, and a central polarimeter at 26-36 GHz. Each polarimeter can rotate at a speed of up to 1 Hz and also can move to discrete angular positions which allow the linear polar parameters Q, U and I to be derived. The instrument is installed in an alt-azimuth telescope which implements several operational modes: movement around the azimuth axis at a constant velocity while the elevation axis is held at a fixed elevation; tracking of a sky object; and raster of a rectangular area both in horizontal and sky coordinates. The control system of both, telescope and instrument, is based in the following technologies: an LXI-VXI bus is used for the signal acquisition system; an EtherCAT bus implements software PLCs developed in TwinCAT to perform the movement of the 5 polarimeters and the 2 axes of the telescope. Science signal, angular positions of the 5 polarimeters and telescope coordinates are sampled at up to 4000 Hz. All these data are correlated by a time stamp obtained from an external GPS clock implementing the Precise Time Protocol-1588 which provides synchronization to less than 1 microsecond. The control software also acquires housekeeping (HK) from the different subsystems. LabVIEW implements the instrument user interface.

Paper Details

Date Published: 24 September 2012
PDF: 10 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845234 (24 September 2012); doi: 10.1117/12.926416
Show Author Affiliations
María F. Gómez-Reñasco, Instituto de Astrofísica de Canarias (Spain)
Marta Aguiar, Instituto de Astrofísica de Canarias (Spain)
José Miguel Herreros, Instituto de Astrofísica de Canarias (Spain)
Roger J. Hoyland, Instituto de Astrofísica de Canarias (Spain)
Vicente Sánchez de la Rosa, Instituto de Astrofísica de Canarias (Spain)
Afrodisio Vega-Moreno, Instituto de Astrofísica de Canarias (Spain)
Teodora Viera-Curbelo, Instituto de Astrofísica de Canarias (Spain)
Ricardo Génova-Santos, Instituto de Astrofísica de Canarias (Spain)
Carlos López-Caraballo, Instituto de Astrofísica de Canarias (Spain)
Rafael Rebolo, Instituto de Astrofísica de Canarias (Spain)
Jose Alberto Rubiño-Martín, Instituto de Astrofísica de Canarias (Spain)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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