Description


Page : 408

Sondrestrom Lidar Operation Log


Operator(s) : M.McCready, K.Richmond, J.Jørgensen
Purpose : Routine data collection
Date(s) : 991208 - 991211
File(s) : L9912080 - L9912107
Comments :
Logfile : l9912080.log

Setup:0


Page : 409
[Variables]
Dye Power=78
Rayleigh Power=440

[0]
Iris=max_opening
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)

[1]
Iris=min_opening
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)

[2]
Iris=twice_min_opening
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)


[3]
Iris=min_opening

Setup:1


Page : 410
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

[4]
Iris=max_opening
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)

[5]
Iris=min_opening
Rayleigh System=Off
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)

[6]
Iris=3mm
Rayleigh System=Off
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)

Setup:2


Page : 411
[7]
Iris=max_opening
Rayleigh System=Off
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)

Logsheet:0


Page : 412

Sondrestrom Lidar Operation Log


Log Sheet 1 of 8
Operators : M.McCready, K.Richmond
Date(s) : 991208 - 991209
File(s) : L9912080 - L9912085
FilesTime [UT]CommentsCntSOpe
L991208021:15:56Start of experiment77000MM
L991208121:19:12incremented file number because I had changed the number of 62350MM
incremented records on the sodium channel (now correct)MM
sodium layer from 80 to 100+ kmMM
L991208122:10:19still clear71650MM
L991208122:44:05can see some haze low in the beams, briefly (genset exh?)72940MM
L991208122:44:34Adjusting iris at Jeff's behest.71440KR
L991208223:59:53adjusted dye converging mirror from 2355-235875000MM
L991208200:02:39adjusted rayleigh converging mirror from 0000-000276000MM
L991208201:27:45Sodium Convergence mirror adjusted69000KR
L991208303:06:10signals from both systems poor and sodium layer gone58000MM
L991208303:09:45beams look good, sky is clear, rayleigh HG okay72000MM
L991208303:12:35readjusted rayleigh & dye conv mirrors, now okay78000MM
(had to adjust dye mirror quite a bit to get signal)
L991208303:21:25sodium layer from 80 to 110 km alt76210MM
L991208304:16:14return from sodium layer now stronger83000MM
L991208405:19:34still clear, nice signals84540MM
L991208405:55:46signals fell again, adjusted both, much better76000MM
L991208406:19:08again, on dye system79920MM
L991208406:52:17again, on dye system, but seems more stable now78500MM
L991208407:03:31guess not, try again80660MM
L991208407:16:56looks like a double sodium layer81090MM
L991208507:31:59still trying to get the dye system back up to a better level82100MM
L991208507:34:26pausing data collection to try to tune the dye HG81320MM

Logsheet:1


Page : 413

Sondrestrom Lidar Operation Log


Log Sheet 2 of 8
Operators : M.McCready, J.Jørgensen, K.Richmond
Date(s) : 991209 - 991209
File(s) : L9912085 - L9912087
FilesTime [UT]CommentsCntSOpe
L991208507:39:00resume data taking--I adjusted HG 1 click, (from 63 to 65mJ)80040MM
couldn't get any higher. The wavemeter read from 589.156
to 589.160 (and low input), so that's not it. Tried mirror
again--maybe the layer is weakening? Does that happen?
L991208508:40:38still clear79280MM
L991208509:46:34still clear, and apparent layer modulating78510MM
L991208610:46:26still clear78710MM
L991208611:31:46Background 079270JJ
L991208612:29:46SNR: 7955/1679630KR
L991208712:32:23Going to adjust iris... SNR 8195/21 na 2091179140KR
L991208712:34:29iris at min opening SNR 7870/23 Na 2141378571KR
L991208712:36:52closing iris seemed to have no effect---investigating78571KR
L991208712:38:02had only closed iris about 50%, now fully closed76461KR
L991208712:38:21SNR 3622/13 Na 14701 -- adjusting convergence36001KR
L991208712:44:37Rayleigh, Na converged. SNR 4577/11 Na 1534542001KR
L991208712:45:32Going to open iris a tad47291KR
L991208712:50:11Iris about double minimum opening. SNR 5819/58 Na 2573158222KR
L991208712:55:34Rayleigh Convergence adjusted SNR 4326/92 Na 2426031802KR
L991208713:01:33Rayleigh Convergence adjusted SNR 5781/119 Na 3071458502KR
L991208713:09:18Going to open iris fully to compare SNRs36752KR
SNR 4036/159 Na 50583
L991208713:11:28No change, from the CCD, it seems like there's another, 36900KR
smaller aperature somewhere, so that opening the iris more
than 1-2 mm has no effect

Logsheet:2


Page : 414

Sondrestrom Lidar Operation Log


Log Sheet 3 of 8
Operators : K.Richmond
Date(s) : 991209 - 991209
File(s) : L9912087 - L9912089
FilesTime [UT]CommentsCntSOpe
L991208713:13:22Don't know why rayleigh counts have gone to @#$! Will39850KR
close iris completely since that seemd to give good SNR
L991208713:14:15iris open SNR 3848/200 Na 55e339850KR
L991208713:15:35Iris closed SNR 904/78 Na 37e39101KR
L991208713:16:23What to do, what to do? 1KR
L991208713:18:12Rayleigh convergence adjusted SNR 3590/52 Na 34e3. Yay!35831KR
L991208713:20:29Halfwave plates are not tracking, but I've never optimized37871KR
them, so I leave it here and let Jeff get some data.
L991208713:31:44SNR 3099/83 Na 41e332601KR
L991208713:32:11John explained to me how to optimize halfwave plates, 30971KR
stopping datataking and turning of laser for Rx adjustment.
L991208713:33:43Data taking stopped30971KR
L991208814:09:41Data taking restarted.01KR
L991208914:11:15Forgot to change rec/scan on SR430, filenum incremented12711KR
L991208914:11:42Halfwave plate control does not work. We tried rebooting,10281KR
reseting control box, unplugging and reconnecting cables, no
good. We're getting some data though, so we'll live with it.
L991208914:18:52Tried to converge Rayleigh and have completely lost the2691KR
signal in the background. Tried opening iris to help find it,
but that didn't help.
L991208914:23:51While trying to adjust halfwave plates and turning off and on3131KR
transmitter, I measured rayleigh power to be 420 mJ.
L991208914:32:20Stopping data taking to invert chopper phase to try to find3761KR
low altitude signal for convergence.

Logsheet:3


Page : 415

Sondrestrom Lidar Operation Log


Log Sheet 4 of 8
Operators : K.Richmond
Date(s) : 991209 - 991209
File(s) : L9912089 - L9912091
FilesTime [UT]CommentsCntSOpe
L991208914:35:50Data taking resumed.1KR
L991208914:36:56That didn't work. I thought we had seen low alt. returns 3691KR
yesterday when the phase was switched.
L991208914:44:37John wanted to open the iris again to try and find the3761KR
Rayleigh signal. No help, it's closed again.
L991208914:45:38Sodium return still fine.3761KR
L991208914:55:08Stopping data taking to try adjusting halfwave plates again.4101KR
L991209015:26:35Datataking resumed.01KR
L991209015:27:55Eggert had forgotten to turn the terminal/computer switch7733KR
on the halfwave plate controller back to computer. Switched
it, and we were able to adjust halfwave plates again. However,
since rayleigh is not converged, we can't optimize tx plate,
though unoptimized tx plate may be what's blocking the
signal, so that we can't see anything to converge on. Tried
going to electronic gating, triggering off line Hz, but still
no signal visible at with gating at 10 µs. Giving up. Will wait
till it gets dark, sodium return looks fine.
L991209015:33:36Halfwave plates are now tracking, for what it's worth.7733KR
L991209016:59:38Rayleigh Convergence mirror adjusted, still can't find signal3KR
L991209017:02:35Sodium Convergence mirror adjusted3963KR
L991209017:11:16Sodium Convergence mirror adjusted3143KR
L991209017:25:14Stopped data taking to turn off chopper, try to find Ra signal1863KR
L991209118:01:05Started data taking15283KR
L991209118:01:26Tx halfwave plate was off by 35 deg. That was blocking it.15283KR

Logsheet:4


Page : 416

Sondrestrom Lidar Operation Log


Log Sheet 5 of 8
Operators : K.Richmond, M.McCready
Date(s) : 991209 - 991210
File(s) : L9912091 - L9912094
FilesTime [UT]CommentsCntSOpe
L991209118:33:38Rayleigh Convergence mirror adjusted35753KR
L991209118:39:00Opened iris56454KR
L991209118:44:28Rayleigh Convergence mirror adjusted65714KR
L991209119:34:30Rayleigh Convergence mirror adjusted32414KR
L991209119:36:38Rayleigh HG adjusted35124KR
L991209119:54:44Nice and clear, I am quite puzzled by the steadily 32554KR
dropping counts...
L991209120:30:52Sodium Convergence mirror adjusted21004KR
L991209220:37:34John thinks there may be a Haze layer20824KR
L991209221:03:28looks like gen-set exhaust is in beams17804MM
L991209221:44:28looks very clear23674MM
L991209222:13:28changed the rec/scan number (SR430 not in cursor mode)4MM
L991209322:14:00 so I incremented file number4MM
L991209323:20:00some genset exhaust again47194MM
L991209300:16:50counts increasing, sky still clear54914MM
L991209401:04:35Nice and clear43894KR
L991209401:44:00Rayleigh Convergence mirror adjusted, Rayleigh HG adjusted32944KR
L991209401:49:58Sporadic Na layer, sporadic E on ISR32824KR
L991209402:23:51Nice and clear, stopping data taking to measure power on 19654KR
rayleigh and try to figure out why counts keep dropping
L991209402:28:24Data taking resumed. Rayleigh power = 420 mJ19894KR
L991209402:32:12Since sodium seems unaffected, and everything else checks out11994KR
L991209402:34:25everytime I fiddle with Rayleigh, going to try to adjust half10174KR
wave plates again. Stopped data taking.

Logsheet:5


Page : 417

Sondrestrom Lidar Operation Log


Log Sheet 6 of 8
Operators : K.Richmond, M.McCready
Date(s) : 991210 - 991210
File(s) : L9912094 - L9912097
FilesTime [UT]CommentsCntSOpe
L991209402:40:23Data taking resumed.35630KR
L991209502:41:34The halfwave plates are not tracking correctly. I am no37690KR
longer having them track.
L991209502:47:07Rayleigh Convergence mirror adjusted41990KR
L991209504:22:19Sodium Convergence mirror adjusted, there must have been 45610KR
a pressure reversal in the building, since the base of the
chimney is uncommonly warm. The blower is unplugged.
L991209504:36:09Sodium Convergence mirror adjusted. I closed the vent to46190KR
outside which was partially opened, maybe that will help.
L991209505:00:21Sodium Convergence mirror adjusted. I'm trying to keep43140KR
the door to the main lidar room closed too...
L991209605:14:07sporadic sodium layer at 95 km?47890MM
L991209605:42:09adjusted dye conv-mirror and Rayleigh HG86000MM
L991209606:17:28tried adjusting dye conv-mirro again88330MM
L991209606:32:23had lost sodium layer completely while taking care of multi-80340MM
crowbars. adjusted conv-mirror, which is now very cold8152
L991209606:43:07tried tweaking the dye CM, but it is all over the place71890MM
L991209607:42:00gen-set exhaust in beam, stars not totally sharp62000MM
L991209708:03:56tweaked dye CM, not cold there anymore, wind change?63450MM
L991209708:24:19again, and can now see a small spike in the Rayleigh and bite71400MM
out in the Dye returns about 7 km
L991209708:33:03tweaked Dye CM again, now blowing cold down there65530MM
L991209708:53:42again70530MM
L991209709:32:55again65650MM

Logsheet:6


Page : 418

Sondrestrom Lidar Operation Log


Log Sheet 7 of 8
Operators : M.McCready, J.Jørgensen, K.Richmond
Date(s) : 991210 - 991210
File(s) : L9912097 - L9912102
FilesTime [UT]CommentsCntSOpe
L991209709:34:27I see what I think is the "7-km" return in the Dye CM scope66800MM
I have been watching it change in intensity and altitude in the
Rayleigh channel
L991209810:39:47more adjusting, 7-km return getting bigger36700MM
L991209811:36:37Rayleigh conv. mirror adj.8000JJ
L991209811:37:41Problem with the Rayleigh laser. Beam very unstable0JJ
L991209811:43:37I'm going to shut the laser down now6340JJ
L991209811:44:30Running with the sodium system only while troubleshooting0JJ
rayleigh laser...
L991209811:59:22The oscillator energi is way down don't know what the 0JJ
problem is though
L991209812:29:32Closed the IRIS6JJ
L991209914:27:34Sodium conv. mirror adj.6JJ
L991209915:01:14Sodium conv. mirror adj.6JJ
L991209915:04:03John was also tricked by the higher resistance that comes4915KR
before the iris is fully closed, and left it partway open.
Closed it.
L991209915:08:50Sodium Convergence mirror adjusted4665KR
L991209915:41:50Turned on incandescent light in receiver room while 5KR
changing rayleigh flashlamps.
L991210118:04:31Opened iris37KR
L991210118:40:13Finished changing flashlamps, getting bubbles out of system.7KR
L991210118:45:03Sodium Convergence mirror adjusted7KR
L991210221:54:38Na CM adjusted again7MM

Logsheet:7


Page : 419

Sondrestrom Lidar Operation Log


Log Sheet 8 of 8
Operators : M.McCready
Date(s) : 991210 - 991211
File(s) : L9912103 - L9912107
FilesTime [UT]CommentsCntSOpe
L991210323:22:31nice sporadic sodium for about 30 mins (bringing up ISR)7MM
L991210300:10:00sporadic sodium gone, now a sharp lower edge to layer7MM
L991210401:31:18still clear7MM
L991210401:46:22sporadic sodium at 100 km7MM
L991210402:31:11sporadic Na gone7MM
L991210402:39:01re-adj dye CM again7MM
L991210504:28:11still clear7MM
L991210607:12:38readjusted dye CM again7MM
L991210608:01:33again7MM
shutting down, although the sky is still clear
L991210709:01:03end of experiment7MM