24 September 2012 Control system architecture of QUIJOTE multi-frequency instrument
Author Affiliations +
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, "Control system architecture of QUIJOTE multi-frequency instrument", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845234 (24 September 2012); doi: 10.1117/12.926416; https://doi.org/10.1117/12.926416
PROCEEDINGS
10 PAGES


SHARE
RELATED CONTENT

OCS: towards a more efficient telescope
Proceedings of SPIE (July 18 2014)
The QUIJOTE TGI control system
Proceedings of SPIE (July 19 2016)
The status of the QUIJOTE multifrequency instrument
Proceedings of SPIE (October 05 2012)
JCMT observatory control system
Proceedings of SPIE (December 13 2002)

Back to Top