Starlink Project
Starlink System Note 3.1

William Lupton

22nd December 1989

The ECH Echelle Spectrograph Model Package


1 Introduction
2 Routine Summary
3 Overview
A Routine Descriptions
  ECH_BLOCKBLOCKDATA to initialise spectrograph configuration
  ECH_COLLIMATOR— Determine which collimator to use at a given wavelength
  ECH_DISP— Determine the dispersion in mm for a given wavelength
  ECH_FORMAT_CENTRE— Determine the appropriate spectrograph settings
  ECH_FRSPR— Determine the free spectral range in Angstroms
  ECH_INIT— Initialise COMMON blocks for a specified instrument combination
  ECH_LOAD— Load COMMON blocks describing spectrograph parameters
  ECH_ORDERNUM— Determine the order number of a specified wavelength
  ECH_PRISMPOS— Determine the optimal prism rotation and position
  ECH_REFINDEX— Determine the refractive index of fused silica
  ECH_SLITANGLE— Determine the optimum slit angle
  ECH_WAVECEN— Determine the central wavelength of the order
  ECH_WCENTRAL— Determine the central wavelength in Angstroms
  ECH_XDISPFS— Determine the cross-dispersion in mm for a given wavelength