Description

Page : 63

Sondrestrom Lidar Operation Log

Operator(s) : E.Gudmundsson
Purpose : Routine data collection
Date(s) : 980604 - 980604
File(s) : L9806040 - L9806041
Comments : Sodium was seen using (noise subtracted) 10 to 20 integrations and 192m bin
width.

Had problems with the halfwave plates so the Rayleigh data is probably not worth
much. I used the chance and tried diffent settups.

When we were aproaching midnight I noticed the background counts were on
there
way up when background should have been decreasing. This indicates perhaps bad
tracking of the halfwave plates.
Logfile : l9806040.log

Setup:0

Page : 64
[Variables]
Dye Power=55mJ
Rayleigh Power=610mJ

[0]
90% PMT Iris=not_installed
Rayleigh System=On
Dye System=On
Daystar=In
Polerizer=In
HalfWave Plates=Tracking

[1]
90% PMT Iris=not_installed
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In
HalfWave Plates=Tracking

[2]
90% PMT Iris=not_installed
Rayleigh System=On
Dye System=On
Daystar=In
Polerizer=Out
HalfWave Plates=Tracking

[3]
90% PMT Iris=not_installed
Rayleigh System=On
Dye System=On
Daystar=Out
Polerizer=In

Setup:1

Page : 65
HalfWave Plates=In

Logsheet:0

Page : 66

Sondrestrom Lidar Operation Log

Log Sheet 1 of 2
Operators : E.Gudmundsson
Date(s) : 980604 - 980604
File(s) : L9806040 - L9806041

Files	Time [UT]	Comments	Cnt	S	Ope
L9806040	00:13:46	Start of experiment	731	0	EG
L9806040	00:25:07	Rayleigh and sodium convergence mirrors tweaked	581	0	EG
		Dye laser HG adjusted, Rayleigh HG adjusted
L9806040	00:50:50	Tweaked Rayleigh convergence	756	0	EG
L9806040	00:50:40	Counts	919	0	EG
		It's getting a bit difficult to converge the Rayleigh channel
		because of high room bacground illumination (the brightness
		of the converging scope is very low)!
L9806040	01:06:08	Counts (background around 70 counts)	866	0	EG
L9806040	01:16:54	SZA=87.55deg changing to setup 1 at SZA~88deg	816	0	EG
L9806040	01:22:16	I belive the sodium layer is visible now on 20scan integration	742	0	EG
		using noise subtracktion and 192m bin width (Johns display)
L9806040	01:34:53	Pausing data collection changing setup	767	0	EG
L9806040	01:38:36	Resuming Data collection using Setup 1	3083	1	EG
L9806040	01:45:21	Clouds visible to the NNW	3094	1	EG
L9806040	01:48:10	Tweaked Rayleigh convergence mirror	3192	1	EG
L9806040	01:49:38	I'm vandering about the Signal@30km/noise count ratio.	3253	1	EG
		Before the mode change it was around 800/40 but now I see		1
		3200/1100 , did I change the setup to soon (SZA wize)		1
L9806040	01:56:31	Sodium clearly visible on the 20scan integeration (same	3325	1	EG
		display setup as described before)
L9806040	01:59:24	Rayleigh background is increasing !! checking halfwave plates	3407	1	EG
L9806040	02:11:45	Done adjusting halfwave plates S/N ratio ~3000/700	3028	1	EG
L9806041	02:32:04	HG and convergence tweaked on both systems tuned to .158	2929	1	EG

Logsheet:1

Page : 67

Sondrestrom Lidar Operation Log

Log Sheet 2 of 2
Operators : E.Gudmundsson
Date(s) : 980604 - 980604
File(s) : L9806041 - L9806041

Files	Time [UT]	Comments	Cnt	S	Ope
L9806041	02:47:17	Had some problems adjusting the halfwave plates it still looks		1	EG
		to me like the background increases when it should be going
		down!!
L9806041	02:49:23	Changing to setup 2		1	EG
L9806041	02:52:05	Done changing running with setup 2		2	EG
L9806041	02:56:58	Changed to setup 3		2	EG
L9806041	03:22:10	adjusted		2	EG
L9806041	03:23:28	Changed setup tried to adjust Halfwaveplates manually	2387	3	EG
		background around 400
L9806041	04:25:04	Going to get the Halfwave plates going again		3	EG
L9806041	04:39:44	Running again using setup 1		1	EG
L9806041	04:44:44	Changing setup again		1	EG
L9806041	04:46:26	runing with setup 0		0	EG
L9806041	05:02:04	End of experiment		0	EG