Description

Page : 804

Sondrestrom Lidar Operation Log

Operator(s) : E.Guðmundsson, J.Jørgensen
Purpose : Run Coordinated with the IS Radar Craig Heinselman
Date(s) : 010518 - 010519
File(s) : L105180 - L105191
Comments : 04062001EG, Note the comment from 00:32. After the comment was made I
went into the Laser room to see if we were having some signal integrity problem.
The following observation/remedy was made:

The seed scope was hooked up to the photodiode for seeding observations and the
scope was triggered by the laser Q-SW out. The photodiode signal was teed off
from the scope and into the Rayleigh SR430 for trigger puposes. This bad way
of
connecting things effectively connected the ground of the laser to the ground of
the RX system, enabling the laser ground bounce to couple into the receiver.

I did remove the seed laser scope hookup at the time but failed to mention it in
the
logsheet. This eliminated the strange profile.

The seed scope setup must be an isolated setup (or the current config
disconnected)
during ops.
Logfile : l0105180.log

Setup:0

Page : 805
[Variables]
Rayleigh Power=530
Dye Power=105mJ

[0]
Iris=1.5mm
Rayleigh System=Off
Dye System=On
Etalon=Out
Polarizer=Out
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

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

Logsheet:0

Page : 806

Sondrestrom Lidar Operation Log

Log Sheet 1 of 1
Operators : E.Guðmundsson, J.Jørgensen
Date(s) : 010518 - 010519
File(s) : L105180 - L105191

Files	Time [UT]	Comments	Cnt	S	Ope
L105180	19:18:31	Start of experiment		1
		Something is wron on the sodium channel, the counts are
		way down from what they should be! working on it
L105180	20:36:59	Incremented	140	0	EG
L105181	21:24:23	Starting the Rayleigh system, aligning Halfwaveplates	1287	0	EG
L105181	21:34:33	No improvement		0	EG
L105181	21:36:23	Running with Rayleigh system now	1249	1	EG
L105181	21:46:43	Incremented	1236	1	EG
L105182	23:36:32	Tweeked the sodium convergence, having a tough time		1	EG
		finding the sodium layer
L105182	23:46:17	Opened the iris a tad to see if I get any sodium		1	EG
L105182	00:32:16	There is a strange bump on the Rayleigh profile!!		1	EG
L105182	02:40:25	I can't seem to get good sodium couts!!	1361	1	EG
L105190	06:04:12	Filenumber incremented	1259	1	JJ
L105190	08:39:15	Still seeing a hint of sodium in the integrated profile	1342	1	JJ
L105191	10:15:20	Filenumber incremented. Sodium still visible when integrating		1	JJ
		20 profiles...	1278
L105191	11:58:56	Sodium lost in the background.		1	JJ
L105191	11:59:27	End of experiment		1	JJ