Abstract: A measurement method for early detection of damage to a blade of an impeller of a turbine is provided. During operation, in a rotational direction of the blade along a circumference which surrounds the impeller, at a plurality of points, in each case a plurality of magnetic fields are generated next to one another substantially in an oscillation direction of the blade, which magnetic fields are influenced by a tip of a turbine blade during transit. Positional values of the tip are detected by at the plurality of points. A positional profile of the turbine blade is then formed from the positional values and a frequency is determined from the positional profile. The frequency is compared with defined frequency values. An alarm event is recognized in case of a sudden and/or pronounced change in the frequency. In addition, a turbine is provided which is configured to carry out the method.

Abstract: An ultrasonic apparatus for cleaning component surfaces (40) by means of a transporting liquid in which ultrasonic waves can be transported, the apparatus including an inlet (6) mounted on a body for filling the transporting liquid into the body, an ultrasonic oscillator (3) in the body for producing ultrasonic waves, a feed in the body for guiding the transporting liquid from the inlet (6) directly to the ultrasonic oscillator (3), so that the ultrasonic waves can be introduced into the transporting liquid and the liquid can be transported, an outlet (7) connected to the feed for discharging the transporting liquid which transports the ultrasonic waves from the body, so that a directed cleaning jet is produced. In addition, a holding device for such an ultrasonic apparatus is provided.

Abstract: An ultrasonic apparatus for cleaning component surfaces (40) by means of a transporting liquid in which ultrasonic waves can be transported, the apparatus including an inlet (6) mounted on a body for filling the transporting liquid into the body, an ultrasonic oscillator (3) in the body for producing ultrasonic waves, a feed in the body for guiding the transporting liquid from the inlet (6) directly to the ultrasonic oscillator (3), so that the ultrasonic waves can be introduced into the transporting liquid and the liquid can be transported, an outlet (7) connected to the feed for discharging the transporting liquid which transports the ultrasonic waves from the body, so that a directed cleaning jet is produced. In addition, a holding device for such an ultrasonic apparatus is provided.

Abstract: A measurement method for early detection of damage to a blade of an impeller of a turbine is provided. During operation, in a rotational direction of the blade along a circumference which surrounds the impeller, at a plurality of points, in each case a plurality of magnetic fields are generated next to one another substantially in an oscillation direction of the blade, which magnetic fields are influenced by a tip of a turbine blade during transit. Positional values of the tip are detected by at the plurality of points. A positional profile of the turbine blade is then formed from the positional values and a frequency is determined from the positional profile. The frequency is compared with defined frequency values. An alarm event is recognized in case of a sudden and/or pronounced change in the frequency. In addition, a turbine is provided which is configured to carry out the method.