PWS100 Present Weather Sensor - Campbell Scientific
PWS100 Present Weather Sensor - Campbell Scientific
PWS100 Present Weather Sensor - Campbell Scientific
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Appendix D. Software Flowchart<br />
G<br />
Polycrystalline processing<br />
Filter FFT<br />
Channel 1<br />
Autocorrelation<br />
and DC removal<br />
Inverse FFT and<br />
select real<br />
component<br />
Find correlation<br />
peak position<br />
Select data width<br />
and clip vales<br />
(limit range)<br />
Shifted and mixed<br />
multi-point data<br />
interpolation<br />
(polynomial fit)<br />
Determine particle<br />
velocity<br />
Retrieve stored<br />
pedestal width<br />
data<br />
Check autocorrelation<br />
velocities with wide range<br />
are within tolerance?<br />
N<br />
Determine particle<br />
velocity from<br />
pedestal width<br />
channel 1<br />
Determine particle<br />
velocity from<br />
pedestal width<br />
channel 2<br />
Store average<br />
correlation<br />
velocity value<br />
Y<br />
Take the minimum<br />
velocity<br />
I<br />
Check pedestal width<br />
velocities with wide range<br />
are within tolerance?<br />
N<br />
End processing<br />
Y<br />
Determine size<br />
from signal<br />
amplitude<br />
J<br />
D-4
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