Method for the continuous determination of the particle size distribution of granular material consisting of solid particles having different particle sizes comprising the steps: - transporting the solid particles in a delivery direction in a delivery flow, wherein solid particles collide with at least one impact body adapted as a waveguide and generate acoustic signals which propagate in each impact body as solid-borne sound waves, - recording the acoustic signals and converting into electrical signals with the aid of at least one vibration sensor, - recording the flow energy of the delivery flow and converting into electrical signals with the aid of at least one force sensor, wherein the flow energy is determined by the velocity and concentration or bulk density of the solid particles of the granular material, - signal processing of the electrical signals of each vibration sensor taking into account the electrical signals of each force sensor to determine the particle size distribution, wherein - before beginning the signal processing of the electrical signals to determine the particle size distribution, at least one normalizing function is created in which a relationship is determined between the electrical signals of each vibration sensor and the signals of the flow energy of the delivery flow recorded by means of the force sensor for different known flow energies, - before beginning the signal processing of the electrical signals to determine the particle size distribution, at least one calibrating function is created in which a correlation is determined between the electrical signals of each vibration sensor processed with the normalizing function and the particle size distribution of the granular material determined using a conventional method to determine the grain size distribution and - the signal processing of the electrical signals to determine the particle size distribution comprises the following steps: - normalizing the electrical signals recorded by the vibration sensor with the normalizing function as a function of the recorded electrical signals of the force sensor in order to eliminate the recorded electrical signals of the vibration sensor from the flow energy, - determining the particle size distribution by applying the calibrating function to the normalized electrical signals. - transporting the solid particles in a delivery direction in a delivery flow, wherein solid particles collide with at least one impact body adapted as a waveguide and generate acoustic signals which propagate in each impact body as solid-borne sound waves, - recording the acoustic signals and converting into electrical signals with the aid of at least one vibration sensor, - recording the flow energy of the delivery flow and converting into electrical signals with the aid of at least one force sensor, wherein the flow energy is determined by the velocity and concentration or bulk density of the solid particles of the granular material, - signal processing of the electrical signals of each vibration sensor taking into account the electrical signals of each force sensor to determine the particle size distribution, wherein - before beginning the signal processing of the electrical signals to determine the particle size distribution, at least one normalizing function is created in which a relationship is determined between the electrical signals of each vibration sensor and the signals of the flow energy of the delivery flow recorded by means of the force sensor for different known flow energies, - before beginning the signal processing of the electrical signals to determine the particle size distribution, at least one calibrating function is created in which a correlation is determined between the electrical signals of each vibration sensor processed with the normalizing function and the particle size distribution of the granular material determined using a conventional method to determine the grain size distribution and - the signal processing of the electrical signals to determine the particle size distribution comprises the following steps: - normalizing the electrical signals recorded by the vibration sensor with the normalizing function as a function of the recorded electrical signals of the force sensor in order to eliminate the recorded electrical signals of the vibration sensor from the flow energy, - determining the particle size distribution by applying the calibrating function to the normalized electrical signals.