Dispersion compensation in stellar interferometry

Details Dispersion compensation in stellar interferometry Dispersion compensation in stellar interferometry

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apopt..35..612l&link_type=abstract

Applied Optics, Volume 35, Issue 4, February 1, 1996, pp.612-620

Astronomy and Astrophysics

Astrophysics

6

Astronomy And Astrophysics, Displays, Instrumentation: Measurement: And Metrology, Interferometry

Scientific paper

In long-baseline stellar interferometry, spectrometers are used to disperse starlight for measuring visibility at multiple wavelengths and for fringe tracking with channeled spectra. However, neither prisms nor gratings are well suited to the observation of fringes with wide spectral bandwidths because the mapping from wave number to detector coordinate is nonlinear. The visibility-measurement and fringe-tracking performance are affected by nonlinearity, and in many cases it is important to compensate for this. Longitudinal-dispersion correctors may be used to compensate for differential air paths in an interferometer, and we show that these may also be used to correct the nonlinear mapping of a spectrometer.

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