Steve Oncley and I are reviewing the measurement of sensor heights with the goal of perhaps reconciling ambiguities in the sensor heights.
The horizontal arrays sonic heights were measured relative to the mean of the heights agl of the reference marks for both the upwind (1.534 m) and downwind (1.53 m) arrays. The profile heights appear to have been measured relative to the height of the reference mark on the profile towere (1.52 m).
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.
The reference mark height for configuration 3 was not measured agl, but was measured to be 15.2 cm below the reference mark for configuration 2 or 1.76m-0.15m = 1.61 m. The heights of the downwind array sonic booms above the reference mark were measured to be
5b |
6t(?) |
6b |
12b |
---|---|---|---|
3.254m |
3.252m (?) |
3.250m |
3.275m |
These heights were measured again on Aug 4 :
1b |
3.263 |
5b |
3.262 |
5t |
4.260 |
7b |
3.261 |
7t |
4.264 |
11b |
3.262 |
11t |
4.264 |
for a mean sonic heights of 3.26m+1.61m+0.05m = 4.92 m and 5.92 m agl. The heights of the upwind sonics appear to be 3.254m+0.05m+1.61m = 4.91 m agl.
The profile sonic (?) heights were measured on Aug 3 :
|
8/3/08 boom hts |
+1.61m+0.05m |
---|---|---|
8m |
6.468m |
8.13m |
7m |
5.544m |
7.20m |
5.8m |
4.256m |
5.92m |
4.8m |
3.316m |
4.98m |
3.3m |
2.110m |
3.77m |
1.5m |
-0.026m |
1.63m |