The goal of this blog is to become a dynamical way of providing fast and updated useful information, to the user of the instrument OSIRIS at GTC, complementing the information provided by GRANTECAN S.A.
It contains information about the manuals, instrument calibration, pipelines for download, tutorials, contributions, announcements, etc. Also, some historical information about the integration, and commissioning of the different observing modes is provided as well.
This Blog is maintained by the OSIRIS Scientific Team.

Friday, December 09, 2005

Los filtros sintonizables (I)

Un Filtro Sintonizable (Tunable Filter) es esencialmente un Fabry-Perot trabajando a baja resolución espectral (equivalente a banda estrecha), con un recubrimiento óptico optimizado en el rango de longitudes de onda a trabajar. Especificaciones y Características (en inglés):

TFs allow monochromatic imaging at any wavelength with a user-selected bandwidth in the range 10--50 Å. At optical wavelengths it is possible to avoid strong airglow lines selecting the appropriate centroid and bandpass within clear atmospheric windows. OSIRIS will use two tunable filters, optimized for the red and blue parts of the spectrum, to cover the full optical range. Piezo-electric transducers allow varying the plate spacing from 2 to 12 microns. Orders are blocked by broad band filters and by an additional set of interference filters of 350--450 Å FWHM. Several advantages for this instrumental approach are: (a) avoid the large expense to manufacture large numbers of narrow band filters, (b) uniformity and control of the instrumental response function for all wavelengths and band-passes, and (c) the use of the same optical path for continuum and emission line images.

La fabricación de los TFs ha sido llevada a cabo por ICOS (Gran Bretaña) y el nuevo sistema de control electrónico de los etalones, basado en tecnología FPGA, por el mismo IAC.

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