January 9, 2013
Following the SCP project, we tested each sonic in a zero-wind enclosure within the EOL temperature chamber, measuring wind component offsets and sonic temperature errors over the nominal range -30 C to 55 C.
The following table shows wind component offsets as okay if the u and v offsets are less than +/- 4 cm/s and the w offsets less than +/- 2 cm/s (between - 20 C and 30 C). If the zero wind offset exceed these thresholds, the table lists the temperature range of the over-limit offset and the largest amplitude of the offset. The plots of offsets versus temperature can then be examined to determine the sign of the offset and temperature at which it occurs.
The sonic temperature corrections are listed as the slope and offset of a linear fit (between -20 C and 30 C), Tc = offset + slope*tc.sonic, where Tc is calculated from temperature, relative humidity, and pressure measured in the zero-wind enclosure.
Location |
Sonic |
Cal date |
u |
v |
w |
tc offset |
tc slope |
|---|---|---|---|---|---|---|---|
Ah1 |
0923 |
15aug12 |
ok |
7-23 C; -7.7 cm/s |
ok |
0.10 |
1.0223 |
repeat calibration |
0923 |
|
ok |
7-23 C; -7.7 cm/s |
ok |
0.04 |
1.0204 |
Ah2 |
0833 |
29aug12 |
ok |
ok |
ok |
0.69 |
0.9971 |
repeat calibration |
0833 |
|
ok |
ok |
ok |
0.79 |
0.9938 |
Ah2 (after 10/19/12@10:15) |
0671 |
|
|
|
|
|
|
Aph3 |
0743 |
05jul12 |
|
|
|
|
|
A4 |
1120 |
19jul12 |
|
|
|
|
|
Ah5 |
0732 |
09jul12 |
|
|
|
|
|
Ah6 |
0800 |
08dec11 |
|
|
|
|
|
A7 |
0673 |
18jul12 |
|
|
|
|
|
Ap8 |
0176 |
22aug12 |
ok |
ok |
ok |
0.50 |
1.0272 |
Ap9 |
1121 |
08dec11 |
|
|
|
|
|
Ap10 |
0677 |
17jul12 |
|
|
|
|
|
Ars11 |
0674 |
13aug12 |
|
|
|
|
|
Ap12 |
0855 |
12sep12 |
|
|
|
|
|
A13 |
0745 |
09jul12 |
|
|
|
|
|
Ap14 |
1124 |
19jul12 |
|
|
|
|
|
A15 |
1122 |
08dec11 |
|
|
|
|
|
A16 |
0740 |
28aug12 |
|
|
|
|
|
A17 |
0856 |
31jan12 |
|
|
|
|
|
A18 |
0744 |
06jul12 |
|
|
|
|
|
A19 (broken joint;removed 9/22/12) |
0672 |
17jul12 |
NA |
NA |
NA |
NA |
NA |
A19 (installed 9/24/12) |
0178 |
9sep12 |
ok |
ok |
ok |
0.72 |
1.0001 |
C.1m |
0200 |
27jun12 |
ok |
ok |
ok |
-0.04 |
1.0192 |
C.2m |
0197 |
03jul12 |
ok |
ok |
ok |
0.74 |
0.9900 |
M.05m |
1455 |
|
|
|
|
|
|
M.1m |
1117 |
|
|
|
|
|
|
M.2m (until 9/27/12@15:03?) |
0538 |
|
|
|
|
|
|
M.2m |
0536 |
|
|
|
|
|
|
M.3m |
0540 |
|
|
|
|
|
|
M.4m |
0738 |
|
|
|
|
|
|
M.5m (until 9/27/12@15:03?) |
0671 |
|
|
|
|
|
|
M.5m |
0537 |
|
|
|
|
|
|
M.10m |
1119 |
|
|
|
|
|
|
M.20m |
0741 |
|
|
|
|
|
|