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An inverse-modelling approach for frequency response correction of capacitive humidity sensors in ABL research with small remotely piloted aircraft (RPA)

An inverse-modelling approach for frequency response correction of capacitive humidity sensors in ABL research with small remotely piloted aircraft (RPA)Atmospheric Measurement Techniques, 7, 3059-3069, 2014Author(s): N. Wildmann, F. Kaufmann, and J. BangeThe measurement of water vapour concentration in the atmosphere is an ongoing
challenge in environmental research. Satisfactory solutions exist for
ground-based meteorological stations and measurements of mean values.
However, carrying out advanced research of thermodynamic processes aloft as well, above the
surface layer and especially in the atmospheric boundary layer (ABL),
requires the resolution of small-scale turbulence. Sophisticated optical
instruments are used in airborne meteorology with manned aircraft to achieve
the necessary fast-response measurements of the order of 10 Hz (e.g. LiCor
7500). Since these instruments are too large and heavy for the application on
small remotely piloted aircraft (RPA), a method is presented in this study that enhances small capacitive humidity sensors to be able to resolve
turbulent eddies of the order of 10 m. The sensor examined here is a
polymer-based sensor of the type P14-Rapid, by the Swiss company Innovative
Sensor Technologies (IST) AG, with a surface area of less than 10 mm2 and
a negligible weight. A physical and dynamical model of this sensor is
described and then inverted in order to restore original water vapour
fluctuations from sensor measurements. Examples of flight measurements show
how the method can be used to correct vertical profiles and resolve
turbulence spectra up to about 3 Hz. At an airspeed of 25 m s−1 this
corresponds to a spatial resolution of less than 10 m.

Atmospheric Measurement Techniques 2014/09/23 - 08:24 Czytaj