View Single Post
  #1  
Old 20-02-2012, 02:37 AM
Hans-Heinrich
Registered User

Hans-Heinrich is offline
 
Join Date: Feb 2012
Location: Austria
Posts: 5
Virtual Couder Screen

Hello,

my name is Hans-Heinrich, I live in Austria/Europe.
Please let me draw your attention to a software that I have recently written: VCS-Virtual Couder Screen - Version 2
When parabolizing my 350mm 1:5.8 mirror some years ago I decided to use a webcam in order to display the Foucault shadowgrams on a computer's display. This was very comfortable but I was not satisfied with the commonly used couder screens positioned in front of the mirror. All those problems with difraction in small zones, difficult brightness-comparison of related zones, the great number of visible zonal apertures and so on.
This is why I wrote a software that emulated couder screens directly on the computers display. There was no need to have a real mask any more! The software really worked very well, as there was of course no diffraction at all and thus I could realise very small zones.

Recently I have improved the software. The most important new functionality in this Version is 'Auto Compare', providing a fully automatical real time comparison of zones - much more exactely than a visual comparison!

Other benefits are:
- Automatical comparison of zone brightness exactely along the effective radius. A great advantage e.g. when measuring the outer zone. An eventually existing sunken edge is visible but it does not influence the measuring results at all.
  • 'Anti Seeing' mechanism
  • Count of zones can be varied arbitrarily
  • Flexible zone radii according to Texereau, Couder, N.O. Carlin, Pin Stick plus free radius definition
  • Comfortable management of readings (automatic averaging)
If you are interested please watch this introduction video:
http://www.youtube.com/watch?v=mCI0J2ua2Xw

Here a video showing how 'Anti Seeing' works:
http://www.youtube.com/watch?v=nIbwSSVkY18

And here is the link to my website:
http://www.sonderloesungen-wenk.at/index.php?id=vcs


Alois Ortner, a very well known austrian optician has tested VCS and writes in a german forum (http://www.astrotreff.de/topic.asp?TOPIC_ID=130724):

"VCS is fast and accurate. ... I was astonished when making repeated readings, could hit the center (I measure without a central obstruction) with +- 0.01mm, the zones with +-0.006 mm and the edge with 0.003 mm"

Greetings from Austria
Hans-Heinrich
Attached Thumbnails
Click for full-size image (VCS 2 zones 3d.jpg)
36.4 KB138 views
Click for full-size image (Auto Comp - from Screen Aps. to Histograms.jpg)
20.4 KB99 views
Click for full-size image (Tab Zones_1.jpg)
54.9 KB106 views
Reply With Quote