HELP WITH VISUAL SPEC

[p1taylor]

Hi all   I am trying to do my spectrograph in visual spec but not getting on to good,  my visual spec  is  4.3.5 and the tutorials are for 3.0.0 and in a mix of French and English are there any tutorials in English and easy to follow.

peter

[Merlin66]

Peter,

I use VSpec and BASS Project for spectral processing.

I thought the VSpec tutorials were OK and the Manual helpful. (Similarly for the BASS Project)

What issues are are you having? We can probably assist.

Ken

 

[p1taylor]

Hi Ken,

               I  can get to calibrating I follow tutorials but must get wrong sum were as nothing happens. 

      peter

 

[Merlin66]

Peter,

I included a brief introductory chapter on using VSpec in the book "Astronomical Spectroscopy for Amateurs", Chapter 10, p 100 - 109.

I'll scan the section and upload a copy for you.

 

[Merlin66]

VSpec introduction extract attached.

Let me know if this helps.

VSpec_Extract.pdf

[Jack Martin]

Peter,

I suggest you use BASS project software for data reduction.

BUT try Ken's suggestion first.

Regards,

Jack

Essex UK

 

[p1taylor]

Hi Ken,

           Yes that really did help got from spectrum to graph, if I need  to line up reference spectrum to match resolution of measured spectrum what do I do, cannot find any thing in vspec book about moving things, is this image OK.

peter

[Merlin66]

Peter,

Not sure what you mean:

""reference spectrum to match resolution of measured spectrum"" what do you want to move?

Once calibrated the reference should then match the target spectrum....

Yes, your result looks OK

 

[p1taylor]

Hi Ken,

              This is what I am trying to do line the images up the reference to the measured, image was don in BASS.

 

            

             

              

[Merlin66]

Peter,

You need to wavelength calibrate the target spectrum first - the reference will then automatically match the target.

 

[p1taylor]

Ken what do I do if it don't quite match  I have one that is a bit out, can I slid it a bit to the left, thanks very much for all your help. 

peter

[Merlin66]

In BASS Project there are a couple of options.

Right click in the active image and you'll see the options "Nudge 1 pixel Left/ right"

Click on active image, "Profile Properties"/ "Calibration" - down the bottom left you'll see "Lambda Offset (nm)" - you can enter a number. Apply, then OK and Refresh the Chart.

 

I'd need to double check the options in VSpec.....

The real question is - why doesn't the calibration match??? Are you using a Neon or Relco lamp? 

 

[Merlin66]

VSpec has a "Translate" function where the profile can be shifted in X. Click "Operations"/"Translate"

 

[p1taylor]

Hi Ken,

           I am not using ether a Neon or Relco lamp.

    peter

[robin_astro]

Hi Peter,

You cannot just "nudge" the spectra,there must be something wrong with the wavelength calibration which you need to sort out.

You are going round in circles. I recommend sticking with one program (and staying with one forum. I see your same questions on  3 or 4 different forums)

Follow the tutorials  I gave you on the BAA forum last year and again today. 

https://britastro.org/comment/3815#comment-3815

https://www.britastro.org/comment/4560#comment-4560

If you  get stuck at a particular point, ask there with the exact details of what went wrong and I will try to help

Robin

[p1taylor]

Hi Robin,    Thanks Robin I will do as you suggest and stick to Visual Spec.

 

peter