Description


Page : 0

Sondrestrom Lidar Operation Log


Operator(s) : E.Guðmundsson
Purpose : Test of extinction and data collection
Date(s) : 040303 - 040303
File(s) : L20040303_000 - L20040303_001
Comments : NOTE: halfwaveplate positions in header are not valid. positions noted in log are.
TX halfwaveplate out of the system and the RX halfwave plate is under manual
control from software.
The test starts out with using a beam splitting polarizer as the analyser in the
receiver. and extinction values are noted.
the second test is the same only now the analyser is a Glan-Thompson polarizer.
Logfile : l0403030.log

Setup:0


Page : 1
[Variables]
Rayleigh Power=430mJ

[0]
front end Iris=3.0mm
Rayleigh System=On
Rayleigh Field stop=2.0mm
Rayleigh path attenuation=0dB
Dye System=Off
Sodium Field stop=2.0mm
Etalon=Out
Daystar=Out
Polarizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0


Page : 2

Sondrestrom Lidar Operation Log


Log Sheet 1 of 5
Operators : E.Guðmundsson
Date(s) : 040303 - 040303
File(s) : L20040303_000 - L20040303_000
FilesTime [UT]CommentsCntSOpe
L20040303_00002:20:06Start of experiment0
L20040303_00002:22:16Finding the minimus chopper setting that does not give 9710
PMT afterpulsing
L20040303_00002:23:48looks ok now, taking data for 10min for refernece9440
RX plate position is 45deg as read from software and verifyed 967
by reading the plate mount scale
L20040303_00002:41:25Paused data acq. Changing offset to 90deg9470EG
L20040303_00002:43:22Taking data with RX plate offset at 90deg190EG
L20040303_00002:46:05Changed RX offset to 90.20 deg180EG
L20040303_00002:47:55Changed RX offset to 89.80 deg180EG
L20040303_00002:50:15Changed RX offset to 89.60 deg 190EG
L20040303_00002:52:15Changed RX offset to 89.40 deg 190EG
L20040303_00002:53:28Changed RX offset to 89.20 deg190EG
L20040303_00002:54:25Looks like Im at the minimum with extinction 947/18=52200EG
L20040303_00002:56:31Changing offset to 45 deg for maximum transmission6440EG
L20040303_00002:58:18Back to normal, taking a few records before changing to 9510EG
the Glan - Thompson Polarizer
L20040303_00003:00:24Paused data acq, while changing to the Glan-Th. polarizer9760EG
L20040303_00003:07:24Glan Thompson Polarizer is in the receiver path now.8690EG
Taking a few records before going to extinction mode
L20040303_00003:12:54Changin to the extinct mode by changing RX plate to 90deg8790EG
L20040303_00003:14:37Counts 80EG
L20040303_00003:15:04Walking the plate position by 0.2 deg at a time90EG
L20040303_00003:15:53Changing offest to 89.8 deg100EG

Logsheet:1


Page : 3

Sondrestrom Lidar Operation Log


Log Sheet 2 of 5
Operators : E.Guðmundsson
Date(s) : 040303 - 040303
File(s) : L20040303_000 - L20040303_000
FilesTime [UT]CommentsCntSOpe
L20040303_00003:16:51Changed offset to 89.6 deg100EG
L20040303_00003:18:21Counts100EG
L20040303_00003:18:27Changed offset to 89.4 deg90EG
L20040303_00003:18:49Counts100EG
L20040303_00003:20:24Changed offset to 89.2 deg100EG
L20040303_00003:20:46Counts 110EG
L20040303_00003:21:59Changed offset to 89.0 deg0EG
L20040303_00003:23:26Counts 130EG
L20040303_00003:24:23Changing offset to 90 deg 0EG
L20040303_00003:25:24Counts80EG
L20040303_00003:26:26Changing offset to 90.20EG
L20040303_00003:27:27Counts 90EG
L20040303_00003:28:24Changing offset to 90.490EG
L20040303_00003:28:31Counts 90EG
L20040303_00003:31:24Changing offset to 90.690EG
L20040303_00003:32:23Counts80EG
L20040303_00003:33:27Changing offset to 90.880EG
L20040303_00003:34:26Counts 80EG
L20040303_00003:35:27Changing offset to 91.080EG
L20040303_00003:36:28Counts80EG
L20040303_00003:36:36Changin offset to 91.280EG
L20040303_00003:37:32Counts 80EG
L20040303_00003:38:26Changing offset to 91.4 0EG
L20040303_00003:38:29Counts 70EG

Logsheet:2


Page : 4

Sondrestrom Lidar Operation Log


Log Sheet 3 of 5
Operators : E.Guðmundsson
Date(s) : 040303 - 040303
File(s) : L20040303_000 - L20040303_000
FilesTime [UT]CommentsCntSOpe
L20040303_00003:40:27Changing offset to 91.6 80EG
L20040303_00003:41:27Counts 70EG
L20040303_00003:41:29Changing offset to 91.870EG
L20040303_00003:42:31Counts 70EG
L20040303_00003:43:28Changing offset to 92.0 70EG
L20040303_00003:44:28Counts80EG
L20040303_00003:45:29changing offset to 92.280EG
L20040303_00003:46:28Counts80EG
L20040303_00003:47:29Changing offset to 92.480EG
L20040303_00003:48:29Counts 80EG
L20040303_00003:49:31Changing offset to 92.690EG
L20040303_00003:50:29Counts 80EG
L20040303_00003:51:31Changing offset to 92.880EG
L20040303_00003:52:29Counts 90EG
L20040303_00003:52:34Changing offset to 93.080EG
L20040303_00003:54:30Counts 90EG
L20040303_00003:55:39Changing offset to 93.290EG
L20040303_00003:56:30Counts 110EG
L20040303_00003:57:33Changing offset to 93.4100EG
L20040303_00003:58:31Counts 110EG
L20040303_00003:59:35Changing offset to 93.6110EG
L20040303_00004:00:32Counts110EG
L20040303_00004:01:34Changing offset to 93.8 120EG
L20040303_00004:02:32Counts 150EG

Logsheet:3


Page : 5

Sondrestrom Lidar Operation Log


Log Sheet 4 of 5
Operators : E.Guðmundsson
Date(s) : 040303 - 040303
File(s) : L20040303_000 - L20040303_001
FilesTime [UT]CommentsCntSOpe
L20040303_00004:03:34Changing to offset 94.0 130EG
L20040303_00004:04:33Counts 130EG
L20040303_00004:05:36Changing offset to 94.2 130EG
L20040303_00004:06:43Counts130EG
L20040303_00004:07:35Changing offset to 94.4150EG
L20040303_00004:08:34Counts 160EG
L20040303_00004:09:36OK this should do it for now, checking the minimum again170EG
at offset 91.8
L20040303_00004:09:40taking a few records at this setting0EG
L20040303_00004:10:35Counts80EG
L20040303_00004:12:42Counts70EG
L20040303_00004:16:15Counts , looks like I went right on to the minimum as 60EG
intended - this indicates that the maximum should be at 46.8
L20040303_00004:18:39changing to offset 46.880EG
L20040303_00004:18:59Counts8780EG
L20040303_00004:20:38Counts 9030EG
L20040303_00004:21:04Extinction ratio aprox 903/7=1299030EG
L20040303_00004:21:58Resuming normal data acq mode, incremented9120EG
L20040303_00104:23:16counts 9180EG
L20040303_00104:57:12Interesting that the minimum counts during the test had a9070EG
broad window of offset yeilding similar returns. The window
was from ~90 to 93.2 which is a polarization rotation of
6.4deg.
L20040303_00104:58:51Counts9080EG

Logsheet:4


Page : 6

Sondrestrom Lidar Operation Log


Log Sheet 5 of 5
Operators : E.Guðmundsson
Date(s) : 040303 - 040303
File(s) : L20040303_001 - L20040303_001
FilesTime [UT]CommentsCntSOpe
L20040303_00104:59:48looks like there is a kink in the signal profile at 70km9020EG
Steep Tgradients?
L20040303_00106:04:15End of experiment9230EG