Fortunately, the French amateur astronomer Christian Buil developed an
Excel spreadsheet that performs the complex calculations of spectrographs
for us: SimSpec.
Is a German somewhat modified version
made by Klaus Vollmann and Thomas
Really important design parameters of the spectrograph are:
The calculation results are shown in the lower part of the sheets. It lists the minimum requirements specified in the optics (minimum diameter of the optical elements) and the dispersion (Angstrom / pixel) and resolution R of the arrangement and the indicated wavelength range.These results are quite accurate in my experience, consistent with the measurable reality. I can only recommend that each prospective spectrograph designer excercises such calculations over again for practice and study the parameters and the resulting characteristics of the virtual spectrograph. It will growing over time a sense of what is important and feasible.
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