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twin TIDI filter wheels
Figure 5. The twin TIDI filter wheels. There are seven filters plus one clear glass disc per wheel. The wheels are electrically connected to an electronics control box below the base plate.

Fabry-Perot interferometer section of TIDI
Figure 6. The Fabry-Perot interferometer section of TIDI. The optic fibre bundle (removed in the figure) enters from the right. The beam is then folded 90 degrees and passed through the filter wheel slot. The filtered beam is then expanded and passes through the etalon chamber (centre of image). The fringe pattern is then focused onto the CliO optic by a Cassegrain mirror system.

TIDI thermal radiators
Figure 7. The TIDI thermal radiators ready to be installed on the experiment.