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Bojan,
A couple of amateurs have tried using a linear array.
It turned out not too successful.
The shape of the spectral lines - tilt, slant, smile, make it very difficult to accurately position the array.
Also the need for very fast frame rates (>150fps) and very small pixels (+/- 3 micron) when using a small SHG like the SolEx or Mini SHG really mean that the current CMOS cameras like the ASI 178 are capable of doing a great job.
Russell,
The distortions you see are due to the scanning rate combined with the sampling ratio and pixel size.
All these variables can be improved. The INTI software already does some fancy foot work in preparing the circular image outcome and removing transversalium (dark lines due to dust on the slit).
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