Description

Page : 1915

Sondrestrom Lidar Operation Log

Operator(s) : Christian, Have, Pedersen, Christian, Have, Pedersen, Christian, Have, Pedersen, Christian, Have, Pedersen, Christian Have Pedersen
Purpose : Daq. on 532 and 607nm
Date(s) : 080228 - 080229
File(s) : L20080221_001 - L20080229_000
Comments : RX HW plate motor not working. Work on how chopper position affects profile.
No flipping in this experiment.
Logfile : l0802280.log

Setup:0

Page : 1916
[Variables]
Chopper delay=51
Rayleigh Power=530mJ

[0]
front end Iris=1.5mm
Rayleigh System=On
Rayleigh Field stop=0.5mm
Rayleigh path attenuation=0dB
Dye System=Off
Sodium Field stop=0.5mm
Etalon=Out
Daystar=Out
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

Page : 1917

Sondrestrom Lidar Operation Log

Log Sheet 1 of 5
Operators : Christian Have Pedersen
Date(s) : 080228 - 080228
File(s) : L20080221_001 - L20080228_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080221_001	21:47:44	Start of experiment		0	cp
L20080221_001	21:47:45	Tweaking with open cabinet. Will be checking if the HW		0	cp
		plates are flipping. Chopper is positioned with focal point
		nearest to the rotation axis.
L20080228_000	21:48:54	Right now there are after pulsing.	417	0	cp
L20080228_000	22:01:58	RX HW plate motor not responding.		0	cp
L20080228_000	22:03:49	Switching to manual tracking without flipping plates		0	cp
		It its/was only the TX HW plate motor that was flipping
		RX HW motor needs to be repaired. Maybe loose connection.
L20080228_000	22:19:52	Tweaked and put on cabinet door now. Just to see the afterpulsing	185	0	cp
		if any shows ?
L20080228_000	22:22:16	Pretty close to acceptable profile on the 532 now		0	cp
L20080228_000	22:25:23	Will try and converge a bit more on the 532, also the chopper		0	cp
		can be pushed up a bit ?
L20080228_000	22:27:03	Chopper settings: 4D -> 4E now		0	cp
L20080228_000	22:29:43	This profile looks okay in terms of afterpulsing.	153	0	cp
		Profile peaks around 20 km alt. Is this okay?
		And max. alt. is around 80 km.
L20080228_000	22:31:53	With this setup it would be interesting to see the result of the		0	cp
		focal point in the chopper blade plane farthest from the
		rotation axis.
L20080228_000	22:33:32	But first the chopper will be pushed up a notch more. Not sure		0	cp
		but it looks a little like afterpulsing are still present.

Logsheet:1

Page : 1918

Sondrestrom Lidar Operation Log

Log Sheet 2 of 5
Operators : Christian Have Pedersen
Date(s) : 080228 - 080228
File(s) : L20080228_000 - L20080228_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080228_000	22:36:27	Pushed up 532 chopper from 4E -> 4F.		0	cp
L20080228_000	22:38:10		166	0	cp
L20080228_000	22:40:25	Profile looks good now.	175	0	cp
L20080228_000	22:43:43	Will now go and slide the chopper, so that the focal point		0	cp
		is farthest away from rotation axis.
L20080228_000	22:49:21	Hmmm that is a tough call, when using only the scope profile,		0	cp
		as a reference. Need to make some markings on the breadboard to			cp
		indicate where the extremus points are. But now the focal point
		should be farthest away from the rotation axis of the chopper
		blade.
L20080228_000	22:52:24	By the way, the cabinet door is closed again.	166	0	cp
L20080228_000	22:53:42	The only thing changed is the chopper position !	167	0	cp
L20080228_000	23:02:03	Now at least 10 profiles has been recorded with the chopper	168	0	cp
		in this position. Will now try and push the chopper, so that
		the focal point is close to the rotation axis.
L20080228_000	23:06:57	Thats done. Cabinet door closed now. Have only changed the		0	cp
		position of the chopper, nothing else.
L20080228_000	23:08:12	Not sure if this comparison can be made without adjusting		0	cp
		convergence and iris. Anyway, afterpulsing is present now.	123
		Will record 10 records with this setting as well.
L20080228_000	23:12:06	Do not think 10 records are needed to see this profile is		0	cp
		not useful. Will do some convergence on this chopper setting

Logsheet:2

Page : 1919

Sondrestrom Lidar Operation Log

Log Sheet 3 of 5
Operators : Christian Have Pedersen
Date(s) : 080228 - 080229
File(s) : L20080228_000 - L20080228_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080228_000	23:16:19	Convergence is on the spot. Will now try to push up chopper.		0	cp
L20080228_000	23:19:01	Chopper setting: 4F -> 51		0	cp
L20080228_000	23:20:23		126	0	cp
L20080228_000	23:21:05	Starting to look like a profile without nearfield annoyance ?	123	0	cp
L20080228_000	23:21:56	Little low in max alt. This may be solved with some tweaking		0	cp
		of the iris ?
L20080228_000	23:22:57	Will push up chopper a notch more...	127	0	cp
L20080228_000	23:23:55	Chopper setting: 51 -> 52.		0	cp
L20080228_000	23:31:47	With the chopper in this setting, the iris and convergence		0	cp
		will now be tweaked to provide a little more height on the
		profile. It also seems that there is still room to increase the
		chopper height.	124
L20080228_000	23:36:49	Interesting. Iris opening has no effect on the profile		0	cp
		shape now. Maybe the focal point is too close to the
		inner egde of the chopper blade ? Will try and move chopper
		a little bit.
L20080228_000	23:55:46	Adjusted chopper position a little, so that the focal is a bit		0	cp
		further away from rotation axis of the chopper blade.
		This gave back the iris control of the profile shape.
		I guess the chopper blade was too close to the focal point.	268
L20080228_000	00:06:41	Closed cabinet door now.		0	cp
L20080228_000	00:09:01		265	0	cp
L20080228_000	00:12:56		254	0	cp

Logsheet:3

Page : 1920

Sondrestrom Lidar Operation Log

Log Sheet 4 of 5
Operators : Christian Have Pedersen
Date(s) : 080229 - 080229
File(s) : L20080228_000 - L20080229_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080228_000	00:13:02	Status: RX HW Plate motor needs some troubleshooting.		0	cp
		It is not responding at all. HW plates are now on manual
		tracking. Troughput has been maximized at start of exp.
		When the focal point is close to the rotation axis of the
		chopper blade it is easier to minimized nearfield attribute and
		eliminate afterpulsing. When the focal point is farthest from
		the rotation axis, this seems more difficult. Not sure if it is
		me getting more experienced or if this in fact is explainable.
		The IR RX path is aligned and it should be possible to get
		some reaction from the IR PMT. Will now try and converge
		IR beam and adjust IR chopper. Will not be opening the
		cabinet door, so the data acquired on 532 and 607 are going
		to be valid.	260
L20080229_000	00:22:27		257	0	cp
L20080229_000	00:41:27	No more adjusting. Was not succesful in getting a response		0	cp
		from IR PMT. Will be operating the RADAR for the next
		6 hours. So will only be converging the LIDAR once in a
		while.
L20080229_000	00:42:47		276	0	cp
L20080229_000	01:09:33		195	0	cp
L20080229_000	01:15:19	Looking at the LASER beam outside, indicates a rather		0	cp
		dense haze layer. This is degrading the profile.	122
L20080229_000	01:18:46		109	0	cp

Logsheet:4

Page : 1921

Sondrestrom Lidar Operation Log

Log Sheet 5 of 5
Operators : Christian Have Pedersen
Date(s) : 080229 - 080229
File(s) : L20080229_000 - L20080229_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080229_000	01:22:06		83	0	cp
L20080229_000	01:32:06		65	0	cp
L20080229_000	02:00:39		63	0	cp
L20080229_000	02:07:10		50	0	cp
L20080229_000	02:08:08	Well. I think this experiment is comming to an end.		0	cp
		Not haze layer anymore, but clouds. Cannot see stars anymore.
L20080229_000	02:09:13	Looking to see if conditions are improving in the next half		0	cp
		hour.	37
L20080229_000	02:11:46		26	0	cp
L20080229_000	02:19:05		6	0	cp
L20080229_000	02:23:16	Thats it. Shutting down this experiment.		0	cp
L20080229_000	02:23:16	End of experiment		0	cp