Abstract: In order to detect subcooled liquid precipitation, a temperature of an object having a precipitation impingement surface is measured, and an occurrence of precipitation onto the precipitation impingement surface is determined. The temperature of the object and the occurrence of the precipitation are analyzed, and a subcooled liquid precipitation warning is output, if there is an increase in the temperature of the object below 0° C. because of the occurrence of the precipitation.

Abstract: An airborne sound transducer comprises an electromechanical transducer, an air impedance matching layer arranged on an acoustically active surface of the electromechanical transducer, and a cover arranged on the air impedance matching layer, an outer surface of the cover forming an exposed acoustic area of the airborne sound transducer. The outer surface is hydrophilic such that a contact angle of water on the outer surface is less than 60°.

Abstract: The invention relates to an ultrasound transducer in particular for application in ultrasound anemometry, comprising an electromechanical transducer (1) with an acoustically active surface, an acoustic matching layer (3) arranged between the acoustic surfaces of the converter and the exposed acoustic surfaces, and an electrical heating element (2). The heating element (2) is arranged between the acoustically active surfaces of the transducer (1) and the matching layer (3).

Abstract: The invention relates to an ultrasound transducer in particular for application in ultrasound anemometry, comprising an electromechanical transducer (1) with an acoustically active surface, an acoustic matching layer (3) arranged between the acoustic surfaces of the converter and the exposed acoustic surfaces, and an electrical heating element (2). The heating element (2) is arranged between the acoustically active surfaces of the transducer (1) and the matching layer (3).

Abstract: First a liquid volume is comminuted into individual droplets in order to measure the volume of liquid droplets, then an electric potential different from that of the ambience is applied to the droplets, said potential determining the droplet charge as a function of its capacitance to its ambience. Finally, after charge to voltage conversion and measuring this capacitance-dependent value, the capacitance and the volume of such a drop can be determined. A liquid drop collecting vessel (2, 40) is provided for that purpose and comprises a droplet dripper (4, 42) to deliver individual droplets, further a device to charge the individual droplets formed by the drippers (4, 42). A measurement device (8, 44) is mounted underneath the liquid droplet collector vessel (2, 42) and is connected to a droplet collector electrode (16, 46) to determine the droplet capacitance by means of a voltage jump or a derivative test value.

Abstract: First a liquid volume is comminuted into individual droplets in order to measure the volume of liquid droplets, then an electric potential different from that of the ambience is applied to the droplets, said potential determining the droplet charge as a function of its capacitance to its ambience. Finally, after charge to voltage conversion and measuring this capacitance-dependent value, the capacitance and the volume of such a drop can be determined. A liquid drop collecting vessel (2, 40) is provided for that purpose and comprises a droplet dripper (4, 42) to deliver individual droplets, further a device to charge the individual droplets formed by the drippers (4, 42). A measurement device (8, 44) is mounted underneath the liquid droplet collector vessel (2, 42) and is connected to a droplet collector electrode (16, 46) to determine the droplet capacitance by means of a voltage jump or a derivative test value.