4m Victor Blanco telescope reflectometry data
* August 98: before washing and after realuminizing (note: the mirror had not been cleaned since early 1997).
* REGULAR CO2 CLEANING
We are looking into the variations of the data (note: the sampling, after rejecting abnormal/unexplained data, was too low in some opportunities), possibly due to local non-uniformity of the coating cleanliness or the way the reflectometer is operated (since Oct 29th, the reflectometer operator has changed).
In parenthesis (last column) is the number of points sampled on the mirror for each result. Each point on the mirror is sampled 3 times (averaged by the reflectometer). On some dates (like 23Dec98), we also indicate the variations (+/-) in the data. For the first row , replace "before/after CO2 cleaning" by "before/after Al". The case "before Al" means the mirror was CO2 dusted and measured just before realuminizing.
|
DATE |
% Reflectivity before CO2 cleaning |
% Reflectivity after CO2 cleaning |
% Scattering before CO2 cleaning |
% Scattering after CO2 cleaning |
Elapsed time (week) between new Al and CO2 |
||||
|
400nm |
700nm |
400nm |
700nm |
400nm |
700nm |
400nm |
700nm |
||
|
7-Aug-98 |
90.0 |
87.31 |
94.46 |
89.93 |
8.32 |
8.75 |
0.58 |
0.33 |
new aluminium |
|
25-Aug-98 |
93.3 |
89.44 |
93.55 |
89.71 |
0.70 |
0.61 |
0.73 |
0.55 |
2 (1) |
|
10-Sep-98 |
92.9 |
89.28 |
93.61 |
89.61 |
0.91 |
0.73 |
0.73 |
0.56 |
4 (1) |
|
30-Sep-98 |
93.45 |
89.39 |
93.26 |
89.37 |
1.12 |
0.86 |
0.92 |
0.73 |
7 (1) |
|
14-Oct-98 |
94.52 |
89.53 |
94.61 |
89.34 |
0.93 |
0.82 |
0.78 |
0.66 |
9 (1) |
|
29-Oct-98 |
88.99 |
86.17 |
91.91 |
88.92 |
0.69 |
0.61 |
0.94 |
0.70 |
11 (1) |
|
12-Nov-98 |
92.05 |
89.01 |
91.57 |
88.79 |
1.09 |
0.95 |
1.12 |
0.83 |
13 (1) |
|
26-Nov-98 |
92.59 |
88.96 |
91.95 |
88.38 |
1.40 |
1.21 |
1.55 |
1.07 |
15 (2) |
|
12-Dic-98 |
92.81 |
88.90 |
92.38 |
88.79 |
1.94 |
1.45 |
1.1 |
0.92 |
17 (3) |
|
23-Dic-98 +/- |
93.87 0.51 |
89.52 0.30 |
93.89 0.78 |
89.51 0.39 |
1.30 0.19 |
1.19 0.09 |
1.20 0.25 |
1.00 0.21 |
19 (4) |
|
10-Jan-99 +/- |
92.61 1.83 |
88.76 1.19 |
93.14 1.02 |
89.25 0.40 |
1.83 0.60 |
1.56 0.19 |
1.56 0.20 |
1.29 0.14 |
21 (4) |
|
23-Jan-99 |
93.09 |
89.06 |
92.99 |
89.07 |
2.29 |
2.03 |
2.04 |
1.52 |
23 (3) |
|
5-Feb-99 |
93.03 |
89.23 |
93.43 |
89.31 |
1.92 |
1.64 |
2.02 |
1.55 |
25 (3) |
|
19-Feb-99 |
92.80 |
89.01 |
92.98 |
89.02 |
2.86 |
2.59 |
2.68 |
2.35 |
27 (3) |
|
6-Mar-99 |
92.49 |
88.74 |
93.00 |
89.06 |
2.98 |
2.42 |
3.18 |
2.45 |
29 (3) |
|
19-Mar-99 |
93.00 |
89.13 |
93.16 |
89.16 |
2.75 |
2.19 |
2.68 |
2.12 |
31 (3) |
|
3-Apr-99 +/- |
93.24 1.03 |
89.13 0.45 |
93.46 0.77 |
89.28 0.23 |
3.62 0.81 |
2.9 0.39 |
3.15 0.07 |
2.77 0.10 |
33 (3) |
