Calibration of MIDI, the Mid-infrared Interferometer for the VLTI

Details Calibration of MIDI, the Mid-infrared Interferometer for the VLTI Calibration of MIDI, the Mid-infrared Interferometer for the VLTI

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt........10s&link_type=abstract

PhD Thesis, Naturwissenschaftlich-Mathematische Gesamtfakultät der Universität Heidelberg, Germany (2002)

Computer Science

Performance

Instrumentation, Interferometry, Calibration, Calibrator Stars, Evolved Stars, Dust Envelopes

Scientific paper

MIDI is the Mid-infrared Interferometer at the Very Large Telescope Interferometer (VLTI). It will perform long-baseline stellar interferometry in the N band (8...13 μm). In the run-up of setting up MIDI, some preparatory tasks had to be solved concerning the calibration of the instrument in the laboratory. Being a crucial sub-system of MIDI, the Internal Delay Line was thoroughly tested in order to characterise its performance. Light sources for different purposes were provided and equipped with appropriate optical layout. Spectral references were also included. The interrelation of a calibrated Internal Delay Line and spectral calibration is presented. For calibration of the instrument during observations, calibrator stars are used. As part of the selection process of suitable objects for a database of such stars, a sub-sample of candidates was checked by interferometric observations in the K' band (2.0...2.3 μm). Special attention was payed to differential effects in narrow sub-bands. The potential of stellar interferometry is shown in the case of some late type stars. High spatial resolution data were used to constrain model parameters of the circumstellar envelopes of these objects.

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