brownrb1 0 Posté(e) 24 juillet 2020 I've been trying to learn how to use the ISIS program to do data reduction on my spectra and have been making some progress. When I get to PROFILE I get this profile (which is attached) of spectrum from my Alpy calibration lamp. I acquired the calibration spectrum using different exposures - 10s, 20s, 60s, and 120s. This profile is from 10s exposure, but they are all about the same. I use an Atik Infinity monochrome camera. The resolution of the profile is not what I expect. been Partager ce message Lien à poster Partager sur d’autres sites
OlivierG 773 Posté(e) 24 juillet 2020 (modifié) Did you check you raw data ? Could you send a screen copy of the calibration lamp ? Modifié 24 juillet 2020 par OlivierG Partager ce message Lien à poster Partager sur d’autres sites
brownrb1 0 Posté(e) 24 juillet 2020 Hi Olivier, Attached are 2 raw images-a 10 s expoure and a 60 s exposure. Both are from Shelyak calibration. Thanks Again Dick Partager ce message Lien à poster Partager sur d’autres sites
astro38 2 Posté(e) 24 juillet 2020 You have to rotate your camera of 180 degrees, your spectrum have the blue part on the right and red on the left. Partager ce message Lien à poster Partager sur d’autres sites
Arnaud17 525 Posté(e) 10 août 2020 Hi Dick, I have looked at your spectrum profile and I noticed that the signal level seems very low. I therefore suspect that what is displayed might be the result of the substraction of two profiles. In the "General" tab of Isis (if I am not mistaken), there is a box which indicates whether you want Isis to remove the sky background or not. The default value (box unchecked) is that you do want to remove the background. When you do the calibration part of the process, you need to ensure that the background is not removed, because the background is essentially equal to the signal. Therefore, you need to make sure that the box is checked when you do a lamp calibration (and only in the case of calibrating your profiles with a lamp). Let me know if that is useful. Regards, Arnaud Partager ce message Lien à poster Partager sur d’autres sites