1. IOT Overview: Calibrations of the VLTI Instruments (MIDI and AMBER)
- Author
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Pascal Ballester, Isabelle Percheron, S. Štefl, Markus Schöller, Andrea Richichi, F. Rantakyrö, Th. Rivinius, Christian A. Hummel, Stephane Brillant, Sebastien Morel, and Markus Wittkowski
- Subjects
Interferometry ,Very Large Telescope ,MIDI ,business.industry ,Computer science ,Calibration ,computer.file_format ,Internet of Things ,business ,computer ,Remote sensing - Abstract
We present here a short review of the calibration processes that are currently applied to the instruments AMBER and MIDI of the VLTI (Very Large Telescope Interferometer) at Paranal. We first introduce the general principles to calibrate the raw data (the “visibilities”) that have been measured by long-baseline optical interferometry. Then, we focus on the specific case of the scientific operation of the VLTI instruments. We explain the criteria that have been used to select calibrator stars for the observations with the VLTI instruments, as well as the routine internal calibration techniques. Among these techniques, the “P2VM” (Pixel-to-Visibility Matrix) in the case of AMBER is explained. Also, the daily monitoring of AMBER and MIDI, that has recently been implemented, is shortly introduced.
- Published
- 2008
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