Description

Page : 1809

Sondrestrom Lidar Operation Log

Operator(s) : Christian, Have, Pedersen, Christian Have Pedersen
Purpose : Data acquisition on IR,Rayleigh,Na and Raman. Na and Raman data bundled in one file.
Date(s) : 070322 - 070323
File(s) : L20070305_001 - L20070323_001
Comments : The acq. of Raman + Na data in 1profile/file was carried out with some succes.
Both profiles shows up on display. However, it was not possible to "catch" sodium
layer when converging Na laser, this may be because a lot of adjustments to the IR
RX path have affected the Na RX path.
The noise level very late in the Na+Raman combined file may be an issue ?
The IR profile is weak and peaks at very low alt.
Logfile : l2303070.log

Setup:0

Page : 1810
[0]
front end Iris=2.5mm
Rayleigh System=On
Rayleigh Field stop=0.5mm
Rayleigh path attenuation=0dB
Dye System=On
Sodium Field stop=0.5mm
Etalon=Out
Daystar=Out
Polarizer=In
HalfWave Plates=Out
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

Page : 1811

Sondrestrom Lidar Operation Log

Log Sheet 1 of 2
Operators : Christian Have Pedersen
Date(s) : 070322 - 070323
File(s) : L20070305_001 - L20070323_001

Files	Time [UT]	Comments	Cnt	S	Ope
L20070305_001	23:15:40	Start of experiment	135	0	cp
L20070322_000	23:23:47	Profiles shows that choppers needs adjustment.	11	0	cp
		Sodium laser not up yet.
L20070322_000	23:30:54	Stopping sodium acq. errors in setup file		0	cp
L20070322_000	23:39:24	Difuser on frontend removed !!!		0	cp
L20070322_000	23:49:29	Restarting IR app.		0	cp
L20070322_000	00:00:35	Restarting Main app. Using new setup for SR430		0	cp
L20070322_000	00:14:23	Up again. Had to use some time on adjusting wavemeter.		0	cp
L20070323_000	00:16:43	Going to be dificult converging the Na+Ra using combined		0	cp
		profile, but here goes.
L20070323_000	01:23:11	Verifying Na chopper position with respect to 10 Hz Na	366	0	cp
		laser firing, so other PMTs are blocked.
L20070323_000	02:18:34	Converging Na profile using 10Hz trigger on scope.		0	cp
		Na profile should be as usual, but I am not able to get a decent return.
		Wavelength okay. Chopper open at 10Hz trigger point in			chopper
		combined profile has been verified as well. The 2.7 ms
		separation between 30Hz trig and 10Hz trig should be enough
		for a decent Raman profile in start of combined profile
		Na profile starts at 405 km and in the profile display a
		very noisy version of the sodium profile is seen and no
		sodium layer is present.
L20070323_000	02:31:43	Incremented filename for half an hour undisturbed dataacq.	472	0	cp
L20070323_001	02:33:29	Working on IR profile. Expecting peak at 10 km, but getting		0	cp
		peak at 0km alt.

Logsheet:1

Page : 1812

Sondrestrom Lidar Operation Log

Log Sheet 2 of 2
Operators : Christian Have Pedersen
Date(s) : 070323 - 070323
File(s) : L20070323_001 - L20070323_001

Files	Time [UT]	Comments	Cnt	S	Ope
L20070323_001	02:44:16	Now adjusting IR chopper	450	0	cp
L20070323_001	02:45:32	Note on Na+Raman profile: Noise floor level seems to be		0	cp
		at a higher level in the very end of the combined profile.
		Also chopper noise still present.
L20070323_001	02:53:59	Restart IR app.		0	cp
L20070323_001	03:05:01	IR profile is weak and peaks at very low alt. Chopper is open		0	cp
		Converging is easy enough, but optimizing return to a decent
		level is not posible. More effort into aligning IR RX path ?
L20070323_001	03:10:53	End of experiment	424	0	cp