A new device for the study of water vapour condensation and gaseous deposition to plant surfaces and particle samples

This note describes the construction and application possibilities of newly developed surface wetness sensors. At the present state of sensor development the absolute values are not reproducible. However, even the relative conductance measurements allow the detection of non-visible water films on samples in the laboratory as well as in the open field. Applications to spruce needles and to aerosol samples deposited on artificial collecting surfaces are presented. Using special experimental conditions, the sensors are also suited for the determination of gas deposition to surfaces.