...
The reference mark height for all configuration 2 sensor heights was measured at the NE tower of the downwind horizontal array (goalposts) = 1.76m. Sonic 1b at the NE end of the array was 1.91m+0.05m = 1.96 m above the reference mark and sonic 12b at the SW end of the array was 1.92m+0.05m = 1.97 m above the reference. Sonic spacing was 1.29 m.
The mean heights above the reference mark of the upwind sonics was 1.92m+0.05m = 1.97 m. The heights agl of the upwind reference marks or the profile reference marks do not appear to have been measured. Assuming a reference height of 1.76m for the horizontal arrays, gives array heights of 1.76m+1.96m
Following are the new profile sensor heights.
nominal | sonic* | +1.76+0.053m | +1.68+0.053** | SHT* | +1.76-0.37m | +1.68-0.37 37m** |
|---|---|---|---|---|---|---|
3m | 1.96m | 3.77m | 3.69m | 2.36m | 3.75m | 3.67m |
4m | 2.90m | 4.71m | 4.63m | 3.33m | 4.72m | 4.64m |
5.5m | 3.99m | 5.80m | 5.72m | 4.43m | 5.82m | 5.74m |
* heights above configuration 2 reference mark
**corrected reference mark height implied by continuity of 3m profile sensors through configurations 2-4 (see Discussion at end).
...
These heights were measured again on Aug 4 :
1b | 5b | 5t | 7b | 7t | 11b | 11t | ||
|---|---|---|---|---|---|---|---|---|
3.263 | 5b | 3.262 5t | 4.260 | 7b | 3.261 | 4.264 | 3.262 | 4.264 |
for mean sonic heights of 3.26m262m+1.61m+0.05m 053m = 4.92 93 m and 5.92 93 m agl. The heights of the upwind sonics appear to be 3.254m+0.05m053m+1.61m = 4.91 92 m agl.
The profile sonic (?) heights were measured on Aug 3 :
| 8/3/08 boom hts* | +1.61m +0.05m | +1.51m +0.05m | +1.53m +0.05m |
|---|---|---|---|---|
8m | 6.468m | 8.13m | 8.03m | 8.05m |
7m | 5.544m | 7.20m | 7.10m | 7.12m |
5.8m | 4.256m | 5.92m | 5.82m | 5.84m |
4.8m | 3.316m | 4.98m | 4.88m | 4.90m |
3.3m | 2.110m | 3.77m | 3.66m | 3.68m |
1.5m | -0.026m | 1.63m | 1.53m | 1.55m |
...
- measured wrt the 1.5m sonic boom (at 1.50m agl )
Discussion
The 3m profile sensors were not moved through configurations 2-4, so that a discrepancy remains between the heights of the 3m profile sensors during configuration 2 (sonic:=3.77m and SHT=3.75m) and those for configurations 3 and 4 (sonic=3.69m and SHT=3.67m). This implies that the reference mark height for configuration 2, measured at the NE horizontal array tower to be 1.76m, did not apply at the profile tower, but should rather have been 1.68m.