UT 20130428 Technical Observing - Active Optics Calibration

Observer: DMiller (Tucson)
Telescope Operator: DHuerta (LBTO)
AO Support: JCGuera (Home)
Telescope Support: JUrban (LBTO)
Instrument Support: JMorris (LBTO)

Summary

Including Z12-21 improved the MODS images PSF from slightly elongated to perfectly round in 0.6" FWHM seeing. Mostly Z12 was corrected (~400 nm).

The position of the pupil on the MODS WFSC has an affect too, similar to the the affect of adding HO corrections

The IDL crosstalk routine works. Collected data for Z11, 12, 13, 16, 17, 18, 19 and 22. May need to refine the scale factors.

Collected "fast" guider images to test averaging of guider images.

Details

06:15 Take over from C Veillet

06:20 David preset to BS9152

06:50 Preset BS9152, GS=8, TS=2, /YAXIS so probe is near the edge of it patrol field

06:54 mods1b.20130428.0022.fits, guider 465, wfsc 66, some stars overexposed, look round in center of image

06:59 mods 23, guider 509, wfsc 70 round, not saturated

07:06 offset, 40, 0

07:07 mods 24, guider 616, wfsc 82, OK

07:12 offset, 80, 0

07:14 mods 25, guider 686, wfsc 90, maybe a bit out of shape, star on in center

07:17 offset, 150, 0

07:19 mods 26, guider 765, wfsc 99, perfectly round in center of image

07:24 offset, 150, 30

07:27 mods 27, guider 857, wfsc 109, slightly elongated, guider image changed shape

07:30 offset, 150, -50 and 150, -30 are out of probe range

07:34 offset, 0, 0

07:37 mods 28, guider 981, wfsc 121, slightly elongated, guider image changed shape, Z12 up to 400 nm, wfsc 0.6 FWHM, guider 0.7 to 0.9 FWHM

07:42 mods 29, guider 1088, wfsc 133, slightly elongated, guider image changed shape, Z12 up to 400 nm, wfsc 0.6 FWHM, guider 0.7 to 0.9 FWHM

07:50 mods 30, guider 1245, wfsc 150, slightly elongated, guider image changed shape, Z12 up to 400 nm, wfsc 0.6 FWHM, guider 0.7 to 0.9 FWHM

07:52 Turn on High order zernikes (12-21)

08:03 mods 31, guider 1352, wfsc 160, perfectly round!!

08:03 mods 32, guider 1427, wfsc 168, perfectly round!!

08:16 offset, -100, 0 out of probe range

08:17 offset, -60, 0 wfsc pupil shift down

08:21 mods 33, guider 1564, wfsc 182, slightly elongated but 60" from center of image

08:27 mods 34, guider 1679, wfsc 193, slightly elongated but 60" from center of image

08:30 offset, 0, 0, turn off send zernikes, take MODS image

08:27 mods 35, guider 1730, wfsc 199, almost round

08:32 turn on send zernikes

08:36 mods 36, guider 1794, wfsc 205, perfectly round

08:39 offset 150, 0 turn off zernike, take MODS image

08:40 mods 37, guider 1844, wfsc 210, different star in center perfectly round, star offset 150 is sausage 3/1

08:42 turn on collimate

08:50 mods 38, guider 2009, wfsc 227, different star in center slightly elongated, star offset 150 is sausage with elongation in the same direction as center star

08:54 mods 39, guider 2050, wfsc 230, same as above, different star in center slightly elongated, star offset 150 is sausage with elongation in the same direction as center star

08:56 preset BS9177 GS=13

09:08 mods 40, guider 2199, wfsc 245, perfectly round in center

09:18 mods 40, guider 2334, wfsc 259, perfectly round in center

09:31 mods 41, guider 2514, wfsc 277, perfectly round in center

10:10 zernike_collect with corrections for crosstalk. Sent just Z11. The measured Z4 ~ 300 and Z22 ~ 60nm. Much better

10:20 zernike collect with Z12, 13, 16, 17, 18, 19, 22

10:35 Started again with Z12, 13, 16, 17, 18, 19, 22

10:45:38 Stopped zernike_collect. SH spots were new the top of the subaps. Tried to send offset but "guide loop didn't pause"

10:47:41 Preset fail with same error.

10:52:53 Preset fail with "guiding not active"

10:54 David preset in ACQUIRE mode. All OK

10:57 David preset in ACTIVE mode with same Field and GS. Same failure: "guiding not active"

10:59 David stop and start GCSL

10:57 David preset in ACTIVE mode with same Field and GS. Success

11:02 offset, 60, 0 so pupil is centered

11:03 mods 43, guider 3461, wfsc 335

11:03 zernike_collect Z11, 12, 13, 16, 17, 18, 19, 22
  • Z11 = +1000, mods 44, guider 3517, wfsc 56
  • Z11 = -1000, mods 45, guider 3546, wfsc 61
  • Z12 = +500, mods 46, guider 3579, wfsc 65
  • Z12 = -500, mods 47, guider 3620, wfsc 71
  • Z13 = +500, mods 48, guider 3656, wfsc 75
  • Z13 = -500, mods 49, guider 3687, wfsc 79
  • Z16 = +500, mods 50, guider 3715, wfsc 83 (Comment in mods image is Z14)
  • Z16 = -500, mods 51, guider 3762, wfsc 88
  • Z17 = +500, mods 52, guider 3793, wfsc 92
  • Z17 = -500, mods 53, guider 3825, wfsc 96
  • Z18 = +500, mods 54, guider 3864, wfsc 100
  • Z18 = -500, mods 55, guider 3891, wfsc 104
  • Z19 = +500, mods 56, guider 3936, wfsc 108
  • Z19 = -500, mods 57, guider 3957, wfsc 112
  • Z22 = +500, mods 58, guider 3989, wfsc 116
  • Z22 = -500, mods 59, guider 4024, wfsc 120

12:00 Modify MODS_L.cfg to have acquisition ROI of 225, 200, 275, 250. Collect 100 images in /home/dlmiller/data/20130428/guiding. Images took ~2.9 seconds even though the ROI was small and exposure time was 500 microseconds.

-- DougMiller - 28 Apr 2013
Topic revision: r3 - 28 Apr 2013, DougMiller
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