Abstract: The invention relates to a method and a device for quantitive determination of a number and size of particulate components contained in a medium flowing along a flow channel. Ultrasonic waves are coupled into the flowing medium, which are reflected at least partially by the particulate components and reflected ultrasonic wave portions which are detected in a ultrasonic time signals, on which the quantitive determination is based. Amplitude values associated with the individual ultrasonic time signals, are detected which are each greater than an amplitude threshold value established for each ultrasonic time signal: The detected amplitude values are assigned to values describing the size and the number of the particulate components.

Abstract: The invention relates to a method and a device for quantitively determining a number and size of particulate components contained in a medium flowing along a flow channel. Ultrasonic waves are coupled into the flowing medium, which are reflected at least partially by the particulate components and reflected ultrasonic wave portions which are detected in a ultrasonic time signals, on which the quantitive determination is based.

Abstract: The invention is a device for coupling ultrasonic waves into a medium via a boundary surface, including at least one ultrasonic-wave transducer unit, which couples ultrasonic waves into the medium via a coupling medium provided between the ultrasonic-wave-generating unit and the boundary surface. The ultrasonic waves generated by the ultrasonic transducer unit are directed into a closed volume, which is provided with at least a first opening and a second opening. A flow of gas, ensures an overpressure inside the closed volume and simultaneously is the coupling medium. The flow of gas is directed into the interior of the volume through the first opening and exits the second opening which directly faces the boundary surface.