Method for ultrasonic determination of the porosity of a workpiece

The Invention relates to a method for determining the porosity of a workpiece (2), in particular a workpiece (2) from a fiber composite material, wherein the workpiece (2) Ultrasound signal and coupled out of the workpiece, an ultrasonic echo signal is received and in which the variation of the amplitude (A) of the ultrasonic echo signal against the depth (t) as a measure of the porosity in the respective depth (t) is used.