Description


Page : 673

Sondrestrom Lidar Operation Log


Operator(s) : E.Guðmundsson
Purpose : Routine data collection
Date(s) : 001029 - 001029
File(s) : L10290 - L10294
Comments : Had some minor difficulties in the start of the run. Found out that the HWP are
not tracking ( one or the other). Slightambient temperature change of arround
+2
deg C caused a very slow drift in wavelength or about 2pm inthe cource of ~5
hours.

Signal induced noise on the sodium channel was detected as operator moved the
chopper open altitude down by 6km (peek of rayleigh at ~15km. It went away
when the chopp altitude was moved up again by 6km (with the peek of the
rayleigh
profile at 21km).
Logfile : l0010280.log

Setup:0


Page : 674
[Variables]
Dye Power=95mJ
Rayleigh Power=530mJ

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

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

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

Logsheet:0


Page : 675

Sondrestrom Lidar Operation Log


Log Sheet 1 of 2
Operators : E.Guðmundsson
Date(s) : 001029 - 001029
File(s) : L10290 - L10294
FilesTime [UT]CommentsCntSOpe
L1029000:19:09Start of experiment00
L1029000:33:05Both channels running now. incremented34251EG
L1029101:05:15Haze in the beam. atempting to adjust HWP anyways1EG
L1029101:09:57Ending HWP adjustment, the haze is interfering to much1EG
L1029101:14:07tweeked Rayleigh convergence, moved sodium chopp +10usec1EG
L1029101:14:18incremented31911EG
L1029201:21:57Strange increase and fall in sodium counts, laseted a few recs??1EG
L1029201:30:46We have a very pathcy thin haze a fewhundred meters13131EG
overhead. this is causing big variations in counts from
profile to profile.
L1029201:33:35UPS! after quiting the HWP adjust routine I forgot to change1EG
recs per scan on the sodium SR430!! Incremented
L1029301:46:01Sodum wavemeter checked now and it hasn't buched from1EG
589.158nm since the beginning of the run!
L1029303:23:23The rayleigh return seems to have fallen steadily oveer the 1EG
last half hour. Converged
L1029303:25:00Checking to see if it is the HWP tracking, going into tweek1EG
mode
L1029303:41:20Done, the HWP were not tracing propperly!! Starting 1EG
data Aq again without Tracking, will look into it!
L1029403:44:20running again with no HWP tracking, incremented88422EG
L1029404:57:48small peak visible on both channels at ~8km84092EG
L1029405:06:01Checkined wavemter. Wavelength 589.158nm, flashing 2EG
589.159nm every now and then. Ambient temp about 1.5deg

Logsheet:1


Page : 676

Sondrestrom Lidar Operation Log


Log Sheet 2 of 2
Operators : E.Guðmundsson
Date(s) : 001029 - 001029
File(s) : L10294 - L10294
FilesTime [UT]CommentsCntSOpe
L1029405:07:30above the starting temp or 24.4deg C.2EG
L1029405:15:55Moved sodium chopper altitude down by 40usec or 6km2EG
L1029405:44:28Wavemter now showing 589.159 and flashing 589.16082002EG
once in a while.
L1029405:55:41Wavemeter showing 589.160 most of the time falshing81162EG
589.159 on acation. Tuned down 2pm or to 589.158nm
This is probly due to the slight drift in ambient temp.
L1029406:03:46Looks as if the chopper altitude move downward is perhaps2EG
introducing signal induced noise. Moving the chopper alt
up by 40usec (6km) to see if that is the case.
L1029406:11:55I think it's safe to say that after moving the chopper altitude 85282EG
up by 6km has changed the topside of the ryaleigh return on
the sodium channel to the better. The conclusion must be
that with the current energy level from the dye laser the
lowest chopper altitude is around 12-15km. The peek of the
sodium reayleigh return is ~21km with this chopper setting
L1029406:25:09End of experiment88162EG