3D “Tragos” design

Forums Spectroscopy 3D “Tragos” design

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    Tony Rodda

    Hi Guys,


    I have this working on the bench.  It’s essentially the Tragos layout using a Star Analyser 200 as the grating.  I’ve had to make do with a 4 degree wedge prism (instead of an 11) so the placement and dispersion aren’t quite maxed.


    But good enough to warrant further investigation.  I need to do a little work inproving focus mechanism and the rgidity in that the outer tube is a collection of focusers and pipes used temporarily to get the placement, etc right but the ‘final’ tube is very solid and I have metal adapters to suit.


    The calibration lines are neon onto an Atik 314E.  (Note the ‘E’, not the best pixel ratio).  I know it’s not properly focused but it was just a quick exposure.  But those lines are reasonably straight and the dispersion is quite linear, which was a surprise.

    PS, blue to the right…


    Notes from the CAOS team suggest that with a 23um slit (in use here) the resolution should be 350+.


    Which isn’t bad for an optical train costing les than ~ £200.  Add another £60 for an OVIO slit and guide mirror/lens.


    To be continued…

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