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Etalon wheel

This has 6 positions, 2 of which are always clear for imaging observations. The remaining 4 positions can be used for Fabry-Perot etalons. The etalons available for use in TAURUS-2 are described in Section 4

The etalon wheel is contained within a sealed cavity. This cavity can be continuously flushed with dry nitrogen in order to maintain low humidity.

A light table is provided for alignment of etalons. The etalon to be aligned is positioned within the light table, and is illuminated with a comparison lamp mounted underneath the table. It is then possible to view the interference fringes through a transparent hatch in the top of the light table.

Thu Apr 7 00:29:52 BST 1994