I finally found time to play with my SHG.
Here are 4 shot from 18th of august :
Ha
Cak
And there nice proms
Hb
On 20th I found with imageJ soft a way to trate He pictures following peter advices.
Unfortunatelly probably optical mis alignement create over exposure, but result is on the right way
18 an 20th august SHG shot
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Re: 18 an 20th august SHG shot
Nice work, Vincent!
Yes, be careful not to overexpose when capturing the HeD3 line. The situation is a bit different than for the strong lines.
Just to clarify: When I try the HeD3 line, I make a series of images (2px spectral slices) covering the region around He and choose (by trial and error) one of these to subtract out as the background (continuum) image. Sometimes it makes a big difference to image quality to take the background image you've chosen and scale it (a factor of 0.90x to 0.97x), using the ImageJ "process" menu, before subtracting. At least one of the background subtracted images should be good enough to continue processing.
Cheers.
Peter.
Yes, be careful not to overexpose when capturing the HeD3 line. The situation is a bit different than for the strong lines.
Just to clarify: When I try the HeD3 line, I make a series of images (2px spectral slices) covering the region around He and choose (by trial and error) one of these to subtract out as the background (continuum) image. Sometimes it makes a big difference to image quality to take the background image you've chosen and scale it (a factor of 0.90x to 0.97x), using the ImageJ "process" menu, before subtracting. At least one of the background subtracted images should be good enough to continue processing.
Cheers.
Peter.
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Re: 18 an 20th august SHG shot
Very impressive. Making me want to have a go of this more and more...
How many 'strips' make up a full disk?
How many 'strips' make up a full disk?
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