Description


Page : 1040

Sondrestrom Lidar Operation Log


Operator(s) : J.Jørgensen, E.Guðmundsson
Purpose : Routine data collection
Date(s) : 020820 - 020821
File(s) : L20020820_000 - L20020821_003
Comments :
Logfile : l0208200.log

Setup:0


Page : 1041
[Variables]
Dye Power=63mJ
Rayleigh Power=515mJ

[0]
Iris=0.6mm
Rayleigh System=On
Dye System=On
Etalon=Out
Daystar=Out
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

[1]
Iris=0.6mm
Rayleigh System=On
Dye System=On
Etalon=Out
Daystar=In
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0


Page : 1042

Sondrestrom Lidar Operation Log


Log Sheet 1 of 2
Operators : J.Jørgensen, E.Guðmundsson
Date(s) : 020820 - 020821
File(s) : L20020820_000 - L20020820_004
FilesTime [UT]CommentsCntSOpe
L20020820_00012:09:01Start of experiment1JJ
12:12:29counts at 30km25311JJ
L20020820_00400:08:18removing daystar29061EG
00:09:49Done removing daystar, running with setup 0, increment0EG
00:10:22crash of the lidar program0EG
00:11:49resumed0EG
00:12:56counts116960EG
01:13:35The skies have been clear all day and it's a beutiful clear 0EG
night. Going to test out the daytime path
01:38:26After tuning trough the entire range of the controller0EG
(0-12V) two similar maxima were found at voltage 4.565V
and 8.990V and the counts @200km were dissapointing
789 and 722. Note this is with the unseeded laser.
Started the seeding and proceeding with the same scan
to see if there is a difference.
02:02:37Laser seeding now doin a voltage sweep0EG
02:14:12Done sweeping in seeded mode. Even though the energy of0EG
the laser has fallen from 505mJ to 420mJ when seeding
was turned off the result of the tuning was that a slightly
stronger signal was found at set voltage 4.280-4.430 with
counts at 30km 847 and 834 (for two scans). Also, when
tuning with the seeded laser there was a bigger difference
from a low in the signal and to the hign. or as much a 50%
drop in signal in lowest signal accheived compared to the

Logsheet:1


Page : 1043

Sondrestrom Lidar Operation Log


Log Sheet 2 of 2
Operators : E.Guðmundsson
Date(s) : 020821 - 020821
File(s) : L20020821_001 - L20020821_003
FilesTime [UT]CommentsCntSOpe
highest signal achived. This was not very noticable during
the unseeded sweep.
L20020821_00102:20:46Attempting to tweek the finess screws using the signal 0EG
with the controller set at 4.280V using the seeded laser.
L20020821_00202:57:29Tweeking the finsesse screws did nothing to improve things0EG
caused only loss of signal, dispited tuning in between tweeks.
02:58:46configuring receiver for the normal nigthtime path.0EG
03:17:04turning off the seeding.106000EG
03:18:15counts124000EG
L20020821_00305:30:38End of experiment0EG