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VLTI Visibility Calculator

VLTI - General Description

The VLTI Baseline Preparation Tool is a tool intended to assist in the preparation of VLTI observation baselines. It uses a model of the VLTI and of various instruments to assess the fringe visibility, given the observed bandpass, the geometry, spectrum and coordinates of the target and the time at which the observations are to be made. It also computes quantities such as shadowing by telescope structures and stroke of the delay lines.

This tool provides an HTML/Java based interface and consists of two pages. The observation parameters page presents the entry fields and widgets for the target spectrum and geometry, time of observation, instrument configuration and results selection. An "Apply" button submits the parameters to the model executed on the ESO Web server. The results page presents the computed results. The optional graphs are displayed within Java applets allowing interactive manipulation. The results are also provided in ASCII and GIF formats for further analysis and printing. Finally a summary of the input parameters is appended to the result page.

VLTI - Technical Information

  • Station Map

  • Station Positions Coordinates

  • Baseline Data (sorted by baseline name)

  • Baseline Data (sorted by baseline length)

  • Baseline Data (sorted by baseline angle)

    Fringe Visibility Calculation Example

  • This example uses the Maple application and assumes the Paranal location.
    Maple Example Calculation

    Target Definition

    In this section, the spectrum and geometry of the target to be observed must be defined.

    Observation Setup


    Fringe Visibility Formulae

  • Version Information

    Send comments and questions to usd-help@eso.org