Description

Page : 1922

Sondrestrom Lidar Operation Log

Operator(s) : Christian, Have, Pedersen, Christian Have Pedersen
Purpose :
Date(s) : 080303 - 080304
File(s) : L20080229_000 - L20080304_001
Comments :
Logfile : l0803030.log

Setup:0

Page : 1923
[Variables]
Rayleigh Power=
Chopper delay=

[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 : 1924

Sondrestrom Lidar Operation Log

Log Sheet 1 of 2
Operators : Christian Have Pedersen
Date(s) : 080303 - 080304
File(s) : L20080229_000 - L20080304_000

Files	Time [UT]	Comments	Cnt	S	Ope
L20080229_000	23:20:45	Start of experiment		0	cp
L20080229_000	23:20:49	Will get the beam image various places in the RX path.		0	cp
		Therefore no data will be acquired the first 4 hrs.



L20080229_000	03:51:51	Starting daq. on rayleigh channel.		0	cp
L20080304_000	04:16:02	Will remove chopper for a second. Need to visualize beam		0	cp
		image in chopper plane.	412
L20080304_000	05:32:08	After a great deal of tweaking with Eggert. There will be		0	cp
		a couple of hours of uninterupted daq.
		Aligment of RX path was not optimized and time
		has been spent on getting the focal point right.
		The image of the laser beam through the chopper plane is
		clear and in focus, although rather small to see without
		a magnifying lens. The beam image being a "Triangle" with
		the tip (High alt.) pointing towards the breadboard and the
		bottom (Low alt.) pointing away from the breadboard.
		The chopper unfortunately is spinning ccw, so that it is
		cutting the beam in the same direction as the propagation
		of the LASER light. Need some real estate to swap the chopper
		Also tried to slide the chopper today with the improved
		focal point. However it not affect the PMT profile much and
		it did not have any affect on the low alt. return of the profile.

Logsheet:1

Page : 1925

Sondrestrom Lidar Operation Log

Log Sheet 2 of 2
Operators : Christian Have Pedersen
Date(s) : 080304 - 080304
File(s) : L20080304_000 - L20080304_001

Files	Time [UT]	Comments	Cnt	S	Ope
L20080304_000	05:51:47	So today it has been verified visually that the LASER beam image		0	cp
		is perpendicular to the radian from the rotation axis of the
		chopper blade to the focal point of the optical path.
		However, the low alt. "bump" in the 532nm profile is still
		there. Next experiment will be to see the effect of the
		chopper blade cutting through the image cw. That is flipping
		the chopper. That requires disassembly of part of the RX 607
		path.
L20080304_000	06:00:32	Looks like a haze layer.	192	0	cp
L20080304_000	06:01:25	Will take down the LASER for a power meassurement.	200	0	cp
L20080304_000	06:06:06	LASER is up again.	113	0	cp
L20080304_000	06:07:03	It is easy now to find a setup without afterpulsing.		0	cp
		The alignment work with Eggert is the reason.
L20080304_001	06:59:06	There is slow changing parameter in the RX path that		0	cp
		screws up the convergence (Alignment) Now it is almost
		impossible to reduce the low alt. return in the profile.
		Anyway it is getting late and the experiment will be ended
		now. Will have to look at it again tomorrow.
L20080304_001	07:01:38	End of experiment		0	cp