Description

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Sondrestrom Lidar Operation Log

Operator(s) : Katelynn, Greer, Christian Have Pedersen
Purpose : Recording Noise Modulations with shorter intergration periods
Date(s) : 080725 - 080725
File(s) : L20080725_000 - L20080725_004
Comments : This was a series of experiments to try and determine the noise modulation and
track the source of the noise. As of yet, I haven't found the source of the noise.
The investigated sources were the 1/2 wave plate controller and the timing unit.
Neither of these items appear to be the source, but further post-analysis may be
done on it. When the timing unit was turned off, the lasers were turned off as
well as the choppers. The SR430 set up files were called NoiseTest.exp,
NoiseTest.cha, NoiseTestIR.exp and NoiseTestIR.cha The most significant
change to the running of the SR430 was the number of profiles integrated together
to produce one record: 100 instead of 1800. While the timing unit was turned off,
the SR430 was triggered from a function generator at 30 Hz.
Logfile : l0807250.log

Setup:0

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[0]
front end Iris=not_installed
Rayleigh System=On
Rayleigh Field stop=0.5mm
Rayleigh path attenuation=0dB
Dye System=Off
Sodium Field stop=0.5mm
Etalon=In
Daystar=4A_In
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

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Sondrestrom Lidar Operation Log

Log Sheet 1 of 1
Operators : Katelynn, Greer, Christian Have Pedersen
Date(s) : 080725 - 080725
File(s) : L20080725_000 - L20080725_004

Files	Time [UT]	Comments	S	Ope
L20080725_000	20:11:11	Start of experiment	0	cp
		SP Energy: 5350 mJ; Counts = 7273
		Sun Tracking
		Background Noise Only
	20:15:00	Stop run and record	0	cp
	20:29:01	Change listening time of 532 channel	0	cp
L20080725_001	20:31:59	Begin again	0	cp
	20:37:27	Finish the test run	0	cp
L20080725_002	20:50:08	Try turning off 1/2 wave plate controller	0	cp
	20:54:43	Finish test of 1/2 wave plate controller	0	cp
		Noise modulation still apparent
	21:05:06	Exploring possible source from timing unit	0	cp
	22:30:23	Timing Unit off	0	cp
		Begin Test
	22:31:50	End Test	0	cp
		Raman PMT kicked off
		Raman hv = 0.650
L20080725_004	22:34:04	Begin Test again	0	cp
		Raman PMT kicked off again, I will leave it be
	22:37:00	Finish Test	0	cp
	22:41:08	Noise Modulation Still evident on 532 channel	0	cp
L20080725_004	22:44:52	End of experiment	0	cp