Chenning and Tom finished measuring the array dimensions this morning, July 1, from around 9:30 until 10:20 am.
Downwind sonic heights
Position* |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
reference mark height (m agl) |
1.50 |
1.495 |
1.51 |
1.58 |
1.55 |
1.55 |
1.57 |
1.51 |
1.51 |
1.53 |
1.525 |
1.54 |
1.52 |
top of lower sonic boom (m above ref) |
1.67 |
1.67 |
1.665 |
1.655 |
1.655 |
1.66 |
1.67 |
1.66 |
1.67 |
1.66 |
1.66 |
1.66 |
1.67 |
top of upper sonic boom (m above ref) |
|
|
2.675 |
2.67 |
2.665 |
2.66 |
2.66 |
2.66 |
2.67 |
2.66 |
2.66 |
|
|
*Note positions are numbered from NE to SW
mean downwind reference height = 1.53 m, mean lower sonic height above reference = 1.663+0.053 m (total mean height = 3.25 m)
mean upper sonic height = 2.664+0.053 m (total mean height = 4.25 m)
3/17/09, TWH: Why did I use 5.5 cm rather than 5 cm as the height of the sonic above its boom?
12/14/09, TWH answer: To account for thickness of saddle on sonic boom; perhaps 5.3 cm would be better
Upwind sonic heights
Position |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
|---|---|---|---|---|---|---|---|---|---|
reference mark height (m agl) |
1.48 |
1.55 |
1.53 |
1.52 |
1.55 |
1.54 |
1.575 |
1.57 |
1.49 |
top of sonic boom (m above ref) |
2.17 |
2.17 |
2.165 |
2.17 |
2.17 |
2.17 |
2.17 |
2.17 |
2.17 |
mean upwind reference height = 1.534 m; mean sonic height above ref= 2.169+0.053 m (total mean height = 3.76 m)
From 12:17 until 12:55, July 1, Gordon and Tom lowered the upwind sonics by 0.5 m to match the height of the lower downwind array.
Sonic spacing
Position |
1-2 |
2-3 |
3-4 |
4-5 |
5-6 |
6-7 |
7-8 |
8-9 |
9-10 |
10-11 |
11-12 |
12-13 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Downwind (m) |
4.04 |
3.97 |
4.00 |
3.99 |
3.99 |
4.00 |
3.98 |
4.01 |
3.97 |
4.02 |
4.01 |
3.98 |
Upwind (m) |
|
|
3.98 |
4.00 |
4.02 |
3.99 |
3.96 |
4.01 |
4.01 |
3.99 |
|
|
Mean downwind sonic spacing = 3.997 m
Mean upwind sonic spacing = 3.995 m
Array spacing
Position |
3 |
7 |
11 |
|---|---|---|---|
Separation (m) |
16.07 |
16.07 |
16.09 |
Upwind check dam
The sonic 7u (upwind array) is 40m downwind of the check dam along azimuth 131 deg magnetic.
The check dam is parallel to azimuth 258.1 deg magnetic.
The sonics on the profile tower are 35m downwind of the check dam.
Profile tower
Reference height agl = 1.52 m
Sonics are 5.3 cm above top of boom; SHT inlets are 37 cm below top of boom
Note that often we could not place sonic and SHT boom mounts at the ideal heights
nominal height |
1.5 |
3 |
4 |
5.5 |
7 |
8 |
|---|---|---|---|---|---|---|
top of sonic boom above ref (m) |
-0.02 |
1.725 |
2.665 |
3.955 |
5.505 |
6.475 |
sonic height agl (+ 1.573 m) |
1.55 |
3.30 |
4.24 |
5.53 |
7.08 |
8.05 |
top of SHT boom above ref (m) |
0.355 |
2.105 |
3.08 |
4.315 |
5.855 |
6.855 |
TRH height agl (+1.15 m) |
1.505 |
3.255 |
4.23 |
5.465 |
7.005 |
8.005 |