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Turbulent Moisture Measurements aboard Instrumented Aircraft with a Capacitive Sensor

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  • 1 Laboratoire d'Aérologic, (URA CNRS 354) Université Paul Sabatier, Toulouse, France
  • | 2 CNRAD, Météo-France, Toulouse France
  • | 3 Laboratoire d'Aérologie, (URA CNRS 354) Université Paul Sabatier, Toulouse, France
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Abstract

The authors show how a capacitive device measuring moisture can be used aboard instrumented atmospheric aircraft as an alternate sensor for turbulence measurement. Using a calibrated Lyman-α sensor as a reference, the time response of the capacitive device can be improved in such a way that turbulent latent heat flux and moisture variance can be calculated with a good level of accuracy. This improvement is done by correction of the amplitude as well of the phase of the signal. These corrections are determined from in-flight measurements therefore, they take into account the time response of the sensor itself, as well as its airborne installation.

Abstract

The authors show how a capacitive device measuring moisture can be used aboard instrumented atmospheric aircraft as an alternate sensor for turbulence measurement. Using a calibrated Lyman-α sensor as a reference, the time response of the capacitive device can be improved in such a way that turbulent latent heat flux and moisture variance can be calculated with a good level of accuracy. This improvement is done by correction of the amplitude as well of the phase of the signal. These corrections are determined from in-flight measurements therefore, they take into account the time response of the sensor itself, as well as its airborne installation.

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