Description

Page : 1008

Sondrestrom Lidar Operation Log

Operator(s) : E.Guðmundsson
Purpose : Test of TX plate flipping
Date(s) : 020627 - 020627
File(s) : L20020627_001 - L20020627_003
Comments : Running with the daystar and a 30db attenuator.

Results were dissapointing as the maximum attenuation of the Rayleigh profile was
arround 10 or so. Tweeking the TX offset to test orthagonality of the plates
yeilded only the result that the original offsets are the most orthagonal ones.

As the this test was done with low clouds and with heavy wind it can not be ruled
out that the poor result is due to dust in the air. This test has to be repeated in
better weather and with much less cloud cover. Preferably thin cirrus or even no
clouds at all.
Logfile : L0206270.log

Setup:0

Page : 1009
[Variables]
Rayleigh Power=510mJ

[0]
Iris=0.6mm
Rayleigh System=On
Dye System=Off
Etalon=Out
Daystar=In
Polarizer=In
HalfWave Plates=Tracking
Rayleigh Filter=2:532(.5nm)
Rayleigh seeding=off

Logsheet:0

Page : 1010

Sondrestrom Lidar Operation Log

Log Sheet 1 of 1
Operators : E.Guðmundsson
Date(s) : 020627 - 020627
File(s) : L20020627_001 - L20020627_003

Files	Time [UT]	Comments	S	Ope
L20020627_001	15:50:18	Start of experiment	0	EG
	15:59:11	added 10db attenuation	0	EG
L20020627_002	21:01:44	It appears as if the attenuation of the Rayleigh signal is	0	EG
		only about a factor of 10 or so with the TX offset that has
		been running uptil now (56)
	21:02:58	changing TX offset from 56 to 57	0	EG
	21:06:24	changing TX offset form 57 to 58	0	EG
	21:09:43	changing TX offset form 58 to 59	0	EG
	21:11:50	changing TX offset from 59 to 56	0	EG
	21:16:06	changing TX offset form 56 to 55	0	EG
	21:19:49	changing TX offset from 55 to 54	0	EG
	21:24:49	changing TX offset from 54 to 53	0	EG
	21:28:59	changing Tx offset from 53 to 52	0	EG
	21:35:23	changing tx offset from 52 to 50	0	EG
	21:39:31	changing TX offset from 50 to 48	0	EG
	21:42:31	From the tweeking of the TX offset it can be seen that the	0	EG
		optimum offsets are the ones found originally with the
		hwp optimization software.
	21:44:10	changed tx offset from 48 to 56	0	EG
	21:50:43	changing from flipping mode to normal sun tracking	0	EG
L20020627_003	21:56:33	End of experiment	0	EG