Description


Page : 1483

Sondrestrom Lidar Operation Log


Operator(s) : E.Guðmundsson
Purpose : Data collction on the IR chanel and 532nm channel
Date(s) : 040621 - 040622
File(s) : L20040621_000 - L20040622_000
Comments : Had problems troughout the day due to Radar interferance and High temperatures.
Started getting usable IR data only arroung 22:00 UT.

532nm channel was not worked on.
Logfile : l0406210.log

Setup:0


Page : 1484
[Variables]
Rayleigh Power=410mJ

[0]
front end Iris=not_installed
Rayleigh System=On
Rayleigh Field stop=2.0mm
Rayleigh path attenuation=0dB
Dye System=Off
Sodium Field stop=2.5mm
Etalon=Out
Daystar=8A_In
Polarizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0


Page : 1485

Sondrestrom Lidar Operation Log


Log Sheet 1 of 3
Operators : E.Guðmundsson
Date(s) : 040621 - 040621
File(s) : L20040621_000 - L20040621_003
FilesTime [UT]CommentsCntSOpe
L20040621_00011:22:24Start of experiment0EG
L20040621_00011:27:29taking background data wile laser is heating up. Laser dumped0EG
into energy monitor head (532nm).
L20040621_00011:33:00Running IR, taking data with the HV turned off.0EG
while the detector cools down.
L20040621_00011:39:35turned halfwavecontrol off0EG
L20040621_00011:57:29HV600V apperture is minimum930EG
L20040621_00012:39:54Increased the IR apperture opening from minimum, just0EG
found the signal again, it was totally out of convergence
at startup.
L20040621_00012:46:13noise counts 10, openng further up950EG
L20040621_00013:27:57opening up furhter on the IR0EG
L20040621_00114:18:22Opening further0EG
L20040621_00114:23:16opened to far, trying again. 0EG
L20040621_00114:26:31a bit better! I'm having a hell of a time of getting the IR0EG
converged!
L20040621_00114:46:43Nose dropped sharply as sun moves towards south, sun gettigng1020EG
directly into receiver in the morning hours, need better baffle
L20040621_00114:47:53Openin further up. Not getting any results.0EG
L20040621_00115:53:40Radar running 0EG
L20040621_00319:22:25Have been working on cooling the enclosure - 50deg inside!0EG
L20040621_00319:34:03Getting better and better signa, something has drifted a lot0EG
with high temperature in the enclosure, cooling it down has
made a big impact - have just reduced the shutter

Logsheet:1


Page : 1486

Sondrestrom Lidar Operation Log


Log Sheet 2 of 3
Operators : E.Guðmundsson
Date(s) : 040621 - 040622
File(s) : L20040621_003 - L20040622_000
FilesTime [UT]CommentsCntSOpe
L20040621_00320:07:22converged IR channel, things looking a bit better now0EG
L20040621_00320:08:09after bringing the temperature in the enclosure down.0EG
L20040621_00321:26:16OPening the apperture on the IR again, system has gotten0EG
cold.
L20040621_00421:33:27Converging IR0EG
L20040621_00421:44:28background noise has fallen dramatically, increasing HV to0EG
625V on IR channel
L20040621_00422:26:27Finally some decent data - 0EG
L20040621_00422:37:58background noise becomming to high lowering HV to 590V0EG
L20040622_00000:17:16Looks as if the IR counts have been gradually coming up1010EG
since this afternoon while 532nm counts have been steady
L20040622_00000:22:13Background counts on the IR are increasing - have to stop 1090EG
down a bit
L20040622_00000:25:11Done stopping down980EG
L20040622_00000:36:36Background noise still increasing on the IR, have to stop970EG
down further
L20040622_00000:39:08Still not enough, Stopping down further.0EG
L20040622_00000:41:17better!0EG
L20040622_00000:47:51Turning off the fans in the IR telescope enclosure, it's 0EG
getting kold.
L20040622_00000:49:38IR counts at 10km =2860 @20km=164, noise at 800EG
L20040622_00000:51:00Profile approacing 40km for 15min integration (60recs)0EG
L20040622_00000:51:28raw profile (15sec) stops at 30km960EG
L20040622_00000:56:40looks like the IR background noise has been dropping since0EG

Logsheet:2


Page : 1487

Sondrestrom Lidar Operation Log


Log Sheet 3 of 3
Operators : E.Guðmundsson
Date(s) : 040622 - 040622
File(s) : L20040622_000 - L20040622_000
FilesTime [UT]CommentsCntSOpe
L20040622_00000:57:09I turned off the fan - was condensation starting to form on0EG
the optics????
L20040622_00000:57:46Can do this no longer - have to shut down!0EG
L20040622_00001:30:21End of experiment990EG