Description


Page : 691

Sondrestrom Lidar Operation Log


Operator(s) : E.Guðmundsson
Purpose : Routine data collection
Date(s) : 001124 - 001125
File(s) : L11240 - L11252
Comments : Tuned for Max return on the dye laser. The magig number from the wavemter
was
589.158nm this time.

Performed tests to map the sodiim overlapp function, note. The test may no
work for altitudes lower than ~10 - 15km. Looked as the counters were
saturating.
Have to take a closer look. Will do this test again wiht a ND filter in the path.

Looks as if the rayleigh beam is diverging a bit as I loose counts when the iris is
stopped down to min apperture. This does not happen on the sodium channel!



Logfile : l0011240.log

Setup:0


Page : 692
[Variables]
Dye Power=79mj
Rayleigh Power=540mJ

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

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

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

Logsheet:0


Page : 693

Sondrestrom Lidar Operation Log


Log Sheet 1 of 2
Operators : E.Guðmundsson
Date(s) : 001124 - 001125
File(s) : L11240 - L11252
FilesTime [UT]CommentsCntSOpe
L1124021:11:24Start of experiment0
L1124021:14:04Tuning for max sodium counts (very clear)102040EG
L1124021:37:56MAx tuning seems to be at 589.158nm98230EG
L1124021:39:16Incremented97540EG
L1124121:55:32A very thin haze layer is present at ~7km, no impact to 87460EG
speek of on the counts
L1124122:20:16Tuned to 589.158nm94220EG
L1124100:57:11Incremented, doing a tune test (maximize return) on Na85300EG
L1125001:03:18Clouds starting to move in33760EG
L1125001:03:42Done tuning max seems to be between 589.157 589.15885810EG
Did this test because it seems as if the sodium density has
decreased since the start of the run, Sodium peek started at
the Rayleigh eq alt of arround 29 to 30km, but now I'm
Observing Rayleigh eq. altitudes of arrounf 32 to 33km
L1125001:16:23Incremented86840EG
L1125101:25:59Incremented85250EG
L1125201:28:28Opening Iris to fully open83981EG
L1125201:30:45Pushing down the Sodium Chopp altitudedown by 15km83071EG
L1125201:33:53This has caused saturation of the system plus signal induced82881EG
noise, reducing HV to 1650V
L1125201:35:31Done82581EG
L1125201:36:34Pusing chopper alt down by further 15km to make sure the 82281EG
chopper is fully open at laser fire instant.
L1125201:38:01Done lowering the chopper alt81931EG

Logsheet:1


Page : 694

Sondrestrom Lidar Operation Log


Log Sheet 2 of 2
Operators : E.Guðmundsson
Date(s) : 001125 - 001125
File(s) : L11252 - L11252
FilesTime [UT]CommentsCntSOpe
L1125201:39:08waiting a few integrations before closing iris to min. opening81371EG
L1125201:46:10Closing iris to minimum apperture82401EG
L1125201:48:17Done closing the iris down81022EG
L1125201:49:40Note: I lost some Rayleigh counts after stopping diwn61842EG
L1125201:51:21chopper further down in alt by 15km (100usec)62922EG
L1125201:53:19No chopper in effect from 0km60432EG
L1125201:53:41Reducing sodium HV to 1600V60432EG
L1125201:54:33done reducing HV61722EG
L1125202:05:17Reducing sodium HV to 1550V63362EG
L1125202:11:07Setting Sodium HV back to 1800V60322EG
L1125202:12:28Done Settign HV61592EG
L1125202:14:03Moved sodium chopper altitude up by 30 km (200us)61002EG
L1125202:21:25Moved Sodium chopper altitude up by 7.5km (50us)63592EG
L1125202:27:23Moved sodium chopper altitude up by 3km (20us)60872EG
L1125202:28:46Ups 3km the wrong way, corrected2EG
L1125202:32:47Moved sodium chopper altitude up by 3km (20us)60892EG
L1125202:35:37No sign of signal induced noise now! Leaving the sodium62552EG
Chopper deilay as is at 3910us from lamp fire signal
L1125202:36:54Starting to converge the Rayleigh channel to see if I can 61482EG
Max that (if I can't I'll have to take a look at the beam exp)
L1125202:44:54No gain in conts to speek of, The beam must be diverging62942EG
L1125202:51:18End of experiment63082EG