What would you like to see in Demetra ?

What would you like to see in Demetra ?

Postby Olivier GARDE » Sat Dec 14, 2019 8:13 am

What would be the improvements or functions that should be implemented in Demetra?

Graphic functions? automatisms? other things ?


Here you have the floor to tell us about your development wishes for Demetra

So don't hesitate to express yourself
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier GARDE
 
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Re: What would you like to see in Demetra ?

Postby Michel Verlinden » Sat Dec 14, 2019 10:37 am

Hello,
An implementation for LHires III and different gratings.
A tool for absolut flux calibration with photometric slits and Alpy600 spectrograph.
Many thanks to Shelyak Instruments.
Michel Verlinden
 
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Re: What would you like to see in Demetra ?

Postby Tony Rodda » Tue Dec 24, 2019 1:56 pm

Hi,
Access to the automatic Calibration parameters file so that "other" spectroscope configurations of emission lines and dispersions can be set.
Many thanks to Shelyak. Demetra is a superb package.
Regards
Tony Rodda
 
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Re: What would you like to see in Demetra ?

Postby jack martin » Fri Dec 27, 2019 4:59 pm

Olivier,

I use a Lhires 111 and all 6 gratings, would like to reduce spectra in Demetra.

Regards,

Jack

Essex UK
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Re: What would you like to see in Demetra ?

Postby Olivier GARDE » Fri Dec 27, 2019 7:41 pm

Hi Jack,

At this time Demetra can reduce spectra from ALPY 600 and soon for eShel and LISA spectrographes.

But the futur goal is to reduce all spectra comme from all spectrographs from the Shelyak range including the LHIRES III.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier GARDE
 
Posts: 1060
Joined: Thu Sep 29, 2011 6:35 am
Location: Rhône Alpes FRANCE

Re: What would you like to see in Demetra ?

Postby Olivier GARDE » Wed Jan 01, 2020 11:55 am

Hi Tony,

Yes in the futur, Demetra can do automatic calibration depending of the wavelength to observe.

And soon a version for the LISA and eShel spectrograph.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
Olivier GARDE
 
Posts: 1060
Joined: Thu Sep 29, 2011 6:35 am
Location: Rhône Alpes FRANCE

Re: What would you like to see in Demetra ?

Postby Francois Cochard » Thu Jan 02, 2020 3:37 pm

Hello all,
Some more details about the calibration in Demetra (to reply to your requests, Tony and Michel).
We're currently working on a significant improvement of the calibration tool. We consider that the automatic calibration is the normal way to use Demetra, but we know that sometime we need to "open the box" to make it (better) work.
Then, we're giving more control to the user for this calibration tool. Specially, we can edit the list of reference line, which is the core of the automatic algorithm.

See the example below:
20200102 Demetra calib.PNG
20200102 Demetra calib.PNG (91.2 KiB) Viewed 2474 times

Is it what you are looking for, Tony? Anyway, you can always edit the text file with these calibration lines, but this is not convenient in real life.

Michel, regarding the Lhires III, the point is that we cannot use the same automatic calibration than Alpy, because we've no idea where we're in the spectrum. We've to define another way, requiring "human help". The good news is that we'll probably have the same need for UVEX (we're working on the instrument right now), then my feeling is that when we've the solution developped for UVEX, then we'll adapt it for the Lhires III.

Friendly,
François
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Re: What would you like to see in Demetra ?

Postby Francois Teyssier » Sun Feb 16, 2020 4:35 pm

Bonsjour à l'équipe Shelyak et merci pour ces nouveaux outils.

Améliorations proposées:
- calcul vitesse radiale héliocentrique et possibilité de corriger le spectre de cette vitesse (BSS_HVEL)
- mémoriser dans le header: nom de l'étoile de référence, type spectral adopté pour l'étoile de référence, hauteur/air mass/heure d'acquisition de cette étoile.
Cela faciliterait le diagnostic lorsque des réponses atmo/intsrumentale plus ou moins erronées sont calculées.

François
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Re: What would you like to see in Demetra ?

Postby Jacques Michelet » Tue Apr 28, 2020 6:56 am

Hello,

As spectrometers need to be fine-tuned, a 'live-tuning' module may be quite helpful in Demetra.
For instance, for slit spectrometers, such a module would help to adjust precisely the output lens to make some lines of the calibration lamp as thin as possible. As the Demetra software already includes an acquisition and a calibration tools, I think that this would not be too complex to develop. To show what I am thinking of, attached is a screenshot of the outputs of a small piece of code I have written in that purpose to adjust my Lisa spectro.
Some other adjustments may be relevant, too, but I am not familiar with all Shelyak spectrometers.
Well, that's just an idea.

Best regards,

Jacques
Attachments
exemple_reglages_lisa.png
Exemple d'aide au réglage d'un Lisa
Jacques Michelet
 
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Re: What would you like to see in Demetra ?

Postby Francois Cochard » Wed Apr 29, 2020 7:42 am

Hello Jacques,

This is a good idea!
We started something long time ago, to help focusing the Alpy 600 ; this is still to be improved.
But the LISA focusing way is very different: we do it on the calibration light.
Well... I put this in the list, and we'll see what can be done.

Anyway, making tools to help the tunning of the instrument is exactily in the "Demetra spirit".

Friendly,

François
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