UIST Engineering
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Instrument Apertures and Foci |
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NOTE: Details on how to measure the UIST apertures and
Focii are given on the main QA-night
web page.
IMPORTANT: the array was inverted BACk to where it usually is in Summer 2007;
so the parameters below should be back to where they were BEFORE the summer 07B cass
block..
Apertures (in arcseconds)
(Last update of this table - 20 June '08)
All apertures to be measured on QA night, please
NOTE: Some of aperture pixels on array shifted to cleaner locations in Spring 08
| Mode |
4 Dec '07 - 20 June '08
Spec and Im-pol
in TOP of array |
20 June '08 - present
Spec and Im-pol
in TOP of array |
| Imaging 0.12 |
+1.97, +3.74 | +2.50, +2.61 |
| Imaging 0.06 |
+2.32, +2.74 | +3.02, +1.39 |
| Spectroscopy |
+2.69, +6.40 | +8.51, -0.43 |
| IFU |
-3.66, -15.19 | +3.66, +1.11 |
| Polarimetry |
+19.84, -16.19 | +27.32,-2.37 |
| Coronograph |
-26.66, +15.81 | -19.06,30.69 |
Notes:
1. POLARIMETRY: Using the same aperture for imaging-polarimetry and
spectro-polarimetry; the former is measured and entered in the system.
This means that with spec-pol during acquisition the star
will always be slightly off (posn angles of more than -90 will make
things progressively worse!); UPICK at the scope will fix this,
moving the target onto the slit..
2. CORONAGRAPH: Again, using the same aperture for pol and non-pol.
Aperture should be measured (with all the other apertures), using the
non-pol reference pixel listed below.
3. UNITS: The arcsec values are simply the mm values times by -1.524
4. ORIENTATION: The first value is E-W, the second N-S, so in the rotated UIST frame the
first value is along the slit (up and down, or in Y in pixels - see below)
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Reference Pixel on array
Use these numbers when measuring apertures
(Last updated/checked - 04 Dec '07 - Moved Spec and Im-Pol to TOP)
Apertures
highlighted in red to be measured on QA night, please
| Mode | Reference Pixel on array, (x,y) |
| Spectroscopy, 1 pix slit |
507.8 |
580 |
| Spectroscopy, 2 pix slit |
506.7 |
580 |
| Spectroscopy, 4 pix slit |
503.5 |
580 |
| Spectroscopy, 5 pix slit |
503.0 |
580 |
| Spectroscopy, 7 pix slit |
509.0 |
580 |
| Spectroscopy, 2 pix slit with spacer |
505.5 |
580 |
| Spectroscopy, 4 pix slit with spacer |
503.8 |
580 |
|
|
| Coronagraphic 6-pix wire |
764.5 |
349.0 |
| Coronagraphic 6-pix wire (pol) |
764.0 |
264.0 |
|
|
| Spec-Pol, 2 pix slit |
511.6 |
740 |
| Spect-Pol, 5 pix slit |
512.5 |
740 |
|
|
| IFU |
499 |
540 |
|
|
| Imaging, 1024x1024 (0.12") |
530 |
530 |
| Imaging, 1024x1024 (0.06") |
530 |
530 |
| Imaging, 512x512 (0.12") |
280 |
280 |
| Imaging Polarimetry |
490 |
737 |
Notes on locating these pixels (daytime eng):
1. POLARIMETRY: The reference pixels for imaging-pol and spec-pol are
measured WITHOUT the waveplate and wollaston prism in the beam.
This is because we do imaging acquisition with spec-pol WITHOUT the prism in the beam.
However...
2. CORONAGRAPH: The reference pixel for coronographic
imaging POLARIMETRY is measured WITH the wollaston prism in the
beam. This is because we have to do imaging acquisition with the wollaston
in the beam (can't use the acquisition eyeball in the OT because this
isn't spectroscopy!). NB: Should UPICK on the LOWER pol beam.
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Additional offsets during source acquisition
(Last update/check - 27 May '07)
| Grism | Filter used | Additional offset
(applied by UPICK) |
|
| Short_K | B2 | right 0.2 arcsec |
| Long_K | B2 | left 0.90 arcsec |
| KL | B2 | left 0.90 arcsec |
| Short_L | 3.4cont | left 0.10 arcsec |
| Long_L | BrA | right 0.17 arcsec |
| M | BrA | left 0.15 arcsec |
|
TTTs PLEASE NOTE: UPICK automatically applies the above offsets.
TSSs do not have to adjust the source position after imaging acquisition
for these grisms (this is why upick puts the star on a slightly different
pixel than is listed earlier on this page).
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The acquisition pixels and additional offsets listed above are read
by the telescope from:
/jac_sw/itsroot/src/oracda_new/uist/uocs.cfg (file at
the summit, not in Hilo - updated/maintained by Russell). This file
also includes the plate scale, array rotation, etc.
UIST Focii
The plot below shows fine-focus measurements taken on QA nights. Note
that not all focii are measured on a given day (so some values are
missing). The dates marked "UIST off scope" indicate when the
instrument was physically taken off the telescope for a period of
time. Thus, after one of these periods values might be expected to change...
IMPORTANT: Note that in August 2006, to accomodate FF values for
IJ and JH spectroscopy, all values displayed on the autofocus.dl
screen have had 1.0 mm (1000 micron) added to the values listed
below. This also affects the values we enter into the bec.cfg
configuration file.
NB: MOST RECENT VALUES ON THE LEFT!
Pink - 0.12 imaging focii;
Blue - Spectroscopy focii;
Yellow - 0.06JHK focii;
Light Blue - 0.06LM focii;
Purple - IFU focii;
Brown - Pol focii.
NOTE: 0.12" imaging and spectroscopy focii should be the same.
Telescope FF Currently In Use
(Last update of this table - 20 June 2008)
| Mode |
Mean Focus, mm |
Focus in Use, mm |
| Imaging, 0.12" |
0.74 |
0.75 |
| Spectroscopy |
0.72 |
0.75 |
| Spectroscopy IJ |
-0.2 |
-0.13 |
| Spectroscopy JH |
0.39 |
0.41 |
| Imaging, 0.06"JHK |
0.96 |
1.00 |
| Imaging, 0.06"LM |
0.71 |
0.72 |
| IFU |
1.00 |
1.06 |
| Pol |
0.76 |
0.86 |
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Notes:
The 0.12" imaging and "normal" spectroscopy
foci should be the same.
The 0.06"JHK focus should be MORE than the 0.12" focus
by about 0.22mm.
The 0.06"LM focus should be LESS than the 0.12" focus
by about 0.03mm.
The IFU focus should be MORE than the 0.12" focus
by about 0.26mm
The Pol focus should be MORE than the 0.12" focus
by about 0.02mm
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Earlier apertures and focii are available on previous versions of
this web page. The date corresponds to when an update was made:
20080620
20070621
20070508
20060925
20060808
20060210
20050628
20040622 |
20040522 |
20040402
20031220 |
20031124 |
20031003 |
20030903 |
20030731 |
20030424 |
20030403 |
20030131 |
20030106
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