Description


Page : 457

Sondrestrom Lidar Operation Log


Operator(s) : E.Gudmundsson
Purpose : Collection of background data to indicate chopper closed to chopper open transition altitudes on both channels.
Date(s) : 000225 - 000225
File(s) : L2250 - L2251
Comments : As an atempt to solve the signal induced noise caused by a to high low altitude
signal on the sodium channel (due to the new receivers high sensitivity) the
following was done:

A controllable digital delay inserted in the timing path of the Sodium laser. This
was done to make it possible to utilize the chopper for the sodium system as well.
The delay is adjusted in such a way that sodium laser fire time is at an closed to
opening transition position of the chopper wheel.

Only the sodium laser is running to provide the nessecary timing.

Logfile : l0002250.log

Setup:0


Page : 458
[Variables]
Dye Power=85mJ

[0]
Iris=1.7mm
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=Out
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)

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

Logsheet:0


Page : 459

Sondrestrom Lidar Operation Log


Log Sheet 1 of 1
Operators : E.Gudmundsson
Date(s) : 000225 - 000225
File(s) : L2250 - L2251
FilesTime [UT]CommentsCntSOpe
L225016:49:36Start of experiment161750EG
L225016:57:40Note, John just started the radar TX console161710EG
L225017:11:21Closed the telescope iris to the minimum opening151291EG
L225017:42:01incremented filenumber, taking sodium data to chec if its 1EG
possible. Very overcast now SZA=79.6
L225117:54:49To many clouds to see anything closing down1EG
L225117:57:09End of experiment165811EG