Project

General

Profile

Focus summaries » History » Version 4

Aaron Roodman, 11/16/2012 12:19 PM

1 1 Aaron Roodman
h1. Focus summaries
2 1 Aaron Roodman
3 4 Aaron Roodman
h3. 11/14/2012
4 4 Aaron Roodman
5 4 Aaron Roodman
Focus again looks reasonable throughout the night.  
6 4 Aaron Roodman
7 4 Aaron Roodman
8 4 Aaron Roodman
attachment:FandA20121114-donutdzvsimageno.pdf
9 4 Aaron Roodman
10 1 Aaron Roodman
h3. 11/13/2012 
11 1 Aaron Roodman
12 2 Aaron Roodman
The focus looks good during the period of the DES mini 1a survey.  During community time there were two images burned to allow the focus to settle, indicated by the blue arrows.  These two looked to have reasonable focus already.  However, there were three other images, circles, taken after large slews where the focus was indeed off by 50-100 microns.  I conclude that there may be good reason to burn an image after large slews.  Lastly, I mark the set of images taken for the program "Fast Cadence Imaging", with one second z band images with slews between every image.  The mean focus is about right, but there do seem to be larger deviations here.
13 1 Aaron Roodman
14 1 Aaron Roodman
attachment:FandA20121113-donutdzvsimageno.pdf
15 1 Aaron Roodman
16 3 Aaron Roodman
A histogram of the donut measured focus is shown here, for the 53 images taken for the Mini 1a survey.  The RMS of the distribution is 12microns, essentially equal to the requirement.  This demonstrates that the necessary focus control to meet the SV requirement is possible, although it should be noted that this is for a series of images having no large slews.
17 3 Aaron Roodman
18 3 Aaron Roodman
attachment:FandA20121113-donutdzhisto-mini1a.pdf
19 3 Aaron Roodman
20 1 Aaron Roodman
h3. 11/12/2012
21 1 Aaron Roodman
22 1 Aaron Roodman
Most of the images on this night were out of focus.  The exact cause is still under investigation, but seems to be due to the tweaks (ie. the values the AOS determines for how much the hexapod should move) not being implemented by the hexapod.  
23 1 Aaron Roodman
24 1 Aaron Roodman
attachment:FandA20121112-donutdzvsimageno.pdf
25 1 Aaron Roodman
26 1 Aaron Roodman
h3. 11/11/2012
27 1 Aaron Roodman
28 1 Aaron Roodman
The focus generally looks fine, except after 150330 where the values are generally out of focus by 100 microns. Conceivably this is due to the same thing that caused problems on 11/12.
29 1 Aaron Roodman
30 1 Aaron Roodman
attachment:FandA20121111-donutdzvsimageno.pdf
31 1 Aaron Roodman
32 1 Aaron Roodman
33 1 Aaron Roodman
h3. 11/10/2012
34 1 Aaron Roodman
35 1 Aaron Roodman
The focus looks reasonable, outside of a few images.  The blue arrows point to burned images for focus.  The focus is a little worse for these images, and there are also several other images which are a bit of focus, presumably from large slews.
36 1 Aaron Roodman
37 1 Aaron Roodman
attachment:FandA20121110-donutdzvsimageno.pdf
38 1 Aaron Roodman
39 1 Aaron Roodman
h3. 11/7/2012
40 1 Aaron Roodman
41 1 Aaron Roodman
The focus looks reasonable.  Some of the community images rotated quickly through different filters, and the focus does seem to change here by a small fixed amount.
42 1 Aaron Roodman
43 1 Aaron Roodman
attachment:FandA20121107-donutdzvsimageno.pdf