Go Back   IceInSpace > Equipment > ATM and DIY Projects

Reply
 
Thread Tools Rate Thread
  #1  
Old 16-11-2019, 10:58 AM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,226
Vegemite etalon tuner Upgrade

Well, after almost ten years of use, my Vegemite etalon tuner has been "upgraded"
I replaced the "hand controller" lid with a SW electronic motor...extended the control cable (now 5mtr) to allow me to remotely control the etalon tuning from the office.
I now have control of focusing, scanning and etalon tuning from the office desk.
I had a few minutes (!!) of clear sky this morning, just enough time to image the proms....using the tuner allows the image on the screen to show immediately the impact of the Doppler shift, I could clearly see differences in intensities between the blue and red wing...pretty neat!
Martin (Q'land) is trialling a similar (but a bit more sophisticated!!) drive system on his set-up.
First image shows the original "manual" set-up from around 2009.

Recommended to all with front tilt tuned etalons......
Attached Thumbnails
Click for full-size image (IMG_1544s.jpg)
199.2 KB65 views
Click for full-size image (ED60_SM60II.jpg)
99.4 KB57 views
Click for full-size image (Vegemite_motor_tuner02.jpg)
42.4 KB56 views
Click for full-size image (Vegemite_motor_tuner01.jpg)
52.3 KB49 views
Click for full-size image (Vegemite_motor_tuner03.jpg)
46.7 KB55 views
Reply With Quote
  #2  
Old 16-11-2019, 12:52 PM
Tinderboxsky's Avatar
Tinderboxsky (Steve)
I can see clearly now ...

Tinderboxsky is offline
 
Join Date: Feb 2012
Location: Tinderbox TAS
Posts: 680
Very clever. I like it.
Reply With Quote
  #3  
Old 18-11-2019, 01:47 PM
hamishbarker
Registered User

hamishbarker is offline
 
Join Date: Mar 2017
Location: Nelson, new zealand
Posts: 30
love your work Ken!
Reply With Quote
  #4  
Old 18-11-2019, 02:07 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,226
Thanks guys, appreciated.
Sometimes the simplest solution is the one which works for you.
May not be elegant, but I can assure you it works 100%.
Recommended.
Reply With Quote
  #5  
Old 19-11-2019, 05:11 AM
N1 (Mirko)
Registered User

N1 is offline
 
Join Date: Oct 2013
Location: Dunners Nu Zulland
Posts: 1,137
Excellent posts Ken, keep 'em coming. I don't respond to many but enjoy them nonetheless, solar updates and great hacks like this alike! I haven't forgotten about the CaK one either. One day....
Reply With Quote
  #6  
Old 19-11-2019, 08:21 AM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,226
Mirko,
Thanks mate!
I find Ha solar scope users have difficulty with two things....focus and etalon tuning.
A single etalon system (PST, Solarmax, Lunt) will always show the spiculation layer (between the "white light" Photosphere and the Ha Chromosphere) at the solar edge....this sometimes confuses the novice when trying to find best focus.
This is best resolved by using a feature (if any!!) on the surface, or a brighter prominence as a focus point. A motorised focuser certainly helps. Practise....

Tuning: Red wing/ On band/ Blue wing???? Doppler shift???
All tilt tuners are set towards the Red wing when closed...
Opening the tilt adjuster moves the central wavelength from the Red wing across the Ha ("On-band") towards the Blue wing - and and eventually to the background continuum.

When "On-band" the image is brightest and the contrast greatest.

One of the best and "Wow" images I've seen for a while was one uploaded by Josef in 2016 - he clearly shows the transition from White light features to Chromospheric features while tuning from the Blue to the Red
Amazing stuff!!!

https://www.dropbox.com/s/im0ujj8fmz..._edge.gif?dl=0

Ken
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 10:59 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Star Adventurer
Advertisement
Lunatico Astronomical
Advertisement
Celestron RASA
Advertisement
EQ8-R
Advertisement
Testar
Advertisement
Astromechanics
Advertisement
Astronomy and Electronics Centre
Advertisement