Description


Page : 26

Sondrestrom Lidar Operation Log


Operator(s) : E.Gudmundsson
Purpose : Routine data collection
Date(s) : 980403 - 980403
File(s) : L9804030 - L9804032
Comments : 2mm Iris on Rayleigh channel at startup,removed later on in the run.
A varible (two different delays) timing fault was observed. Timing shifted in
middle of of a run to 15microsecs (dye output pulse to SR430 busy). Shifted back
again later on to 203ns.

The first shift happend about 10-20 min before the obervation was made at 02:31
on dye sum ratio (Johns display). At that time the timing error before was not
known. When the timing shifted back later on at 04:04 the error was measured as
203ns.

This timing shift is clearly visible on the profile at low altitudes. A timing error of
203ns produces a profile starting at fewer counts for the first bin with a low
altitude
peek reachinng higher than when 15micros. delay is present.
Logfile : L9804030.log

Setup:0


Page : 27
[Variables]
Dye Power=65mJ
Rayleigh Power=590mJ

[0]
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=Out
HalfWave Plates=Out

Logsheet:0


Page : 28

Sondrestrom Lidar Operation Log


Log Sheet 1 of 2
Operators : E.Gudmundsson
Date(s) : 980403 - 980403
File(s) : L9804030 - L9804031
FilesTime [UT]CommentsCntSOpe
L980403001:01:29Start of experiment0EG
L980403001:06:57Dye system tuned to 589.157 Convergence mirror adjusted0EG
L980403001:16:19I'm having some problems with the Rayleigh system0EG
L980403001:18:28Convergence mirror adjusted Rayleigh1290EG
L980403001:19:32Heavy haze now380EG
L980403001:29:45Tuned Dye to 589.1581360EG
L980403001:40:34Opened receiver to check filter setting, shone some light in!1310EG
L980403001:41:23Rayleigh Convergence mirror adjusted1830EG
L980403001:46:01Turned 90% PMT buttom fixture one turn ( Lowered the0EG
PMT)
L980403002:00:14Rayleigh HG tweeked1940EG
L980403002:02:4490% PMT dropped "one thread" further1910EG
L980403002:06:17Adjusted Rayleigh convergence mirror1710EG
L980403002:10:10Adjusted Rayleigh convergence mirror1330EG
L980403002:31:18!!! Noticed a Jump in sodium ratio on Johns display , this jump 0EG
can only be explaned by a jump in the lower sum number (the
sodium counts remained fairly constant. Perhaps the timing
has shifted! going to check that out now >still 15 microsecs!
L980403003:14:0790% PMT in original position1310EG
L980403003:15:17Convergence mirror adjusted Rayleigh1570EG
L980403103:28:23Paused1500EG
L980403103:31:58!! Iris removed from system resumed1450EG
L980403104:04:09I've been monitorin the timing, The sr430 Busy swithed0EG
to about 200ns just now

Logsheet:1


Page : 29

Sondrestrom Lidar Operation Log


Log Sheet 2 of 2
Operators : E.Gudmundsson
Date(s) : 980403 - 980403
File(s) : L9804032 - L9804032
FilesTime [UT]CommentsCntSOpe
L980403208:03:49End of experiment7480EG