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Simple CCD Spectrographs(c)1997..2022 John E. Hoot
Traditional spectrograph designs are too large and complex to be useful on small amateur telescopes. Rather than using the traditional format, the slitless spectrograph discards all of the optics to the left of the diffraction grating in the figure below.
The Slitless Imaging spectrograph are characterized by several key attributes that contribute to their relative simplicity:
These features allow for the simplification of the mathematics of classical spectrographs as follows:
An example of simple CCD spectrograph is diagramed below:
Software to generate 100 LPI and 200 LPI grating on conventional overhead transparency films along with software to extract and process spectra can be found on SSC's web page. Since this article first appeared, a number of seller are offering diffraction grating on 35mm slides, or in filter mount that can be inserted into your optical train to perform slitless spectroscopy. Additionally, objective grating with up to 200 lines per inch (~7.87 lines/mm) can be printed on overhead projector film with most laser or ink jet printers. PDF files with 200 lpi and 100 lpi grating are below: 200 Lpi Grating
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