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28 July 2010 Making a robust, reliable, and a highly available DIMM seeing monitor
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During the last 20 years, many DIMM instruments have been developed to measure astronomical seeing. The IAC has been involved in several projects to run different campaigns to characterize its observatories. However, the cost in manpower to maintain and operate these instruments has been too high and it is mandatory to minimize this effort by constructing a reliable, robust and available seeing monitor. A review of all sources of errors has been done in order to fit very reliable measurements: acquisition parameters, box size, signal threshold, SNR threshold, flux, deformations and vibrations for centroid calculations, best pixel scale, jitter in the images sampling, light bandwidth, CCD noise, as well as the centroid calculation algorithm. Experimental measurements about the influence of exposure time, number of images for computing the seeing or defocus have been carried out to identify the practical limits of the instrument. The IAC automatic DIMM design has been reviewed to improve its robustness and its availability to guarantee the minimum down-time and to maximize the time between failures. The new design will be shown as part of this work.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
José Miguel Delgado, David Jiménez Mejías, Luis Fernando Rodríguez Ramos, and Héctor Vázquez Ramió "Making a robust, reliable, and a highly available DIMM seeing monitor", Proc. SPIE 7736, Adaptive Optics Systems II, 77364U (28 July 2010);

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