Field acceptance test procedure of Present weather sensors

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Field acceptance test procedure of Present
weather sensors

• Fabrice Zanghi

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Method

• 8 PWD22 sensors to determine one single present
  weather (reference)

• Comparison with a spectro-pluviometer

• Visibility measurement

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Comparison with the Thies sensor (A single PWD22)
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Present weather, Dispersion of the diagnosis

• Inter sensors Comparison

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Visibility

• Sensors Comparison with the site references

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Visibility dispersion (average over 8 sensors)

• Dispersion of a PWD22 with regard to 7 identical
  sensors (median)

• The dispersion of a PWD22 with regard to the
  reference sensors of the site gives similar
  results .

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Thies sensor, experience, experimental assembly

• Installation and walked past of calibrated balls
  in front of optics

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Behavior with various diameters
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Behavior various speeds
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quantities of drops (glass balls) valuation
Number of balls deducts from their weight and
number of balls counted by Thies Prior, the
average weight of a balls is estimated. We divide
the mass of balls got back by the middle weight
of a ball. For optimise the accuracy, the
experiment is starteg again several times.
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Conclusion

• We observe a measurement dispersion between
  identical sensors

• A sensor considered as a reference is not realy
  completed

• The difficulty will be in the future to be able
  of estimating these sensors types. With the
  growth of complexity and data provided by such
  instrument, it will be more and more difficult to
  check them in the future.

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