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I can help.....
Which telescope/camera/ detector will you use?
The total solar energy distribution (Planck Curve) is severely modified by atmospheric absorption and will also be impacted by the QE efficiency of the grating/ camera.
A 600 l/mm reflection grating is a good start.
You need to assess what size of grating, collimator and imaging lens you will use. This will determine the spectral coverage of your chip.
A basic Classical design spectrograph with either a Surplus Shed adjustable slit or a couple of pencil sharpener blades would work...
What software will you use to process the spectral image?
The attached spreadsheet will allow you to do the initial calculations.
Drop me a PM for more details.
Hope this helps.
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