Description

Page : 1441

Sondrestrom Lidar Operation Log

Operator(s) : E.Guðmundsson, Claus Johannsen
Purpose : Taking noise data
Date(s) : 040428 - 040429
File(s) : L20040427_001 - L20040429_001
Comments : Checking for variability in signal (interferance) of aproxx 6 min periode
Logfile : l0404280.log

Setup:0

Page : 1442
[Variables]
Rayleigh Power=430mJ

[0]
front end Iris=3.0mm
Rayleigh System=On
Rayleigh Field stop=1.0mm
Rayleigh path attenuation=3dB
Dye System=Off
Sodium Field stop=2.0mm
Etalon=Out
Daystar=Out
Polarizer=In
HalfWave Plates=In
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

Page : 1443

Sondrestrom Lidar Operation Log

Log Sheet 1 of 2
Operators : E.Guðmundsson
Date(s) : 040428 - 040428
File(s) : L20040427_001 - L20040428_002

Files	Time [UT]	Comments	Cnt	S	Ope
L20040427_001	18:13:41	Start of experiment		0	EG
L20040428_000	18:16:25	Chopper moved down		0	EG
L20040428_000	18:18:24	Background a bit to strong putting an ND filter in the path		0	EG
L20040428_000	18:20:15	Done putting 3dB attenuator in the path.		0	EG
L20040428_000	18:22:37	Note, the radar is running, skies clear above right now		0	EG
		but scattered clouds arround, hoping to get enough data
		without cloud interuptions to see if there is variability in the
		data.
L20040428_000	18:33:27	Note. laser running normally firing into a beam dump		0	EG
L20040428_000	18:54:03	Have been watching the energy monitor for the past few		0	EG
		nutes and energy is stable at 420mJ, short term variability
		observed at +-5mJ. No dips in energy observed over the
		10min interval.
L20040428_000	18:55:54	Noise data looks stable - indicates that the detect threshold		0	EG
		is not beeeing modified over time and or the PMT dc base level
L20040428_000	19:35:10	Still looking stable and so is the energy on the energy monitor		0	EG
L20040428_000	20:38:32	Stopped taking noise data		0	EG
L20040428_000	20:43:12	Taking data with laser in the air note the 3dB is still in the		0	EG
		path and the rayleigh iris is at minimum blocking signal	313
L20040428_001	20:51:25	some haze and clouds up there.		0	EG
L20040428_001	21:35:18	more clouds	210	0	EG
L20040428_001	22:08:46	opened the iris to 2mm, get a lot of noise		0	EG
L20040428_002	22:10:53	closed iris again, still to much background	488	0	EG
L20040428_002	22:13:12	reconverged	488	0	EG

Logsheet:1

Page : 1444

Sondrestrom Lidar Operation Log

Log Sheet 2 of 2
Operators : E.Guðmundsson, Claus Johannsen
Date(s) : 040428 - 040429
File(s) : L20040428_002 - L20040429_001

Files	Time [UT]	Comments	Cnt	S	Ope
L20040428_002	22:36:01	clouds going through beam	204	0	EG
L20040428_002	00:08:01	removing attenuator		0	EG
L20040428_002	00:10:34	done removing attenuator	1082	0	EG
L20040428_002	00:12:06	counts	1214	0	EG
L20040428_002	00:27:50	Still some noise but looks like the profile is better	1251	0	EG
L20040428_002	00:28:16	Thick clouds all arround - hoping the hole lasts to deterimine	1178	0	EG
		if the lidar is operational again.
L20040428_002	00:30:36	pushing chopper up by 50us (7.5km)	1141	0	EG
L20040428_002	00:32:30	done moving chopper	1200	0	EG
L20040429_000	00:42:27	Claus taking over - collecting data without any intervention	1271	0	EG
L20040429_001	03:40:58	counts	1238	0	CJ
L20040429_001	04:33:58	countsEnd of experiment	-1	0	CJ