A detection assembly for detecting a wear status of a chopping knife assembly (9a..b) of a chopping device provided for processing a flow of material , wherein the chopping device has a rotary chopping drum receiving the chopping knife assembly (9a..b) as well as at least one counter cutter which cooperates with the chopping knives , wherein the detection assembly comprises at least one sensor assembly (23a..b) which has a magnetic excitation assembly and a flux conducting device magnetically coupled thereto, wherein the sensor assembly (23a..b) provides a pole assembly which forms at least one magnetic pole with a pole surface for conducting magnetic flux out, wherein, during a rotation of the chopping drum , at least a portion of the chopping knife passes the pole assembly , wherein each chopping knife passing the pole assembly forms an air gap assembly with at least one air gap towards the pole assembly , and at least one magnetic circuit excited by the excitation assembly is accordingly closed via the respective chopping knife , wherein the detection assembly has a measuring assembly and an evaluation unit , wherein the measuring assembly detects at least one measured magnetic variable relating to the magnetic flux in at least one magnetic circuit which is excited by the excitation assembly and the evaluation unit determines the wear status of the respective chopping knife from the at least one detected measured magnetic variable , wherein the voltage (38a..e) induced when a chopping knife assembly (9a..b) sweeps over the sensor assembly (23a..b) forms the measured magnetic variable and the detection assembly determines the induced voltage (38a..e) and records it as a voltage signal (49a..e), characterized in that the voltage signal (49a..e) is resolved into its frequency components in the evaluation unit by means of frequency analysis , the frequency components are separated into frequency components of a fundamental oscillation and into frequency components of an superimposed oscillation which cause distortions in the signal, wherein the separated frequency components of the superimposed oscillation which cause a distortion in the signal are inverse transformed in the time domain, and a measure of the wear status and/or the cutting sharpness of a chopping knife is derived from the inverse transformed frequency components of the superimposed oscillation . the voltage (38a..e) induced when a chopping knife assembly (9a..b) sweeps over the sensor assembly (23a..b) forms the measured magnetic variable and the detection assembly determines the induced voltage (38a..e) and records it as a voltage signal (49a..e), characterized in that the voltage signal (49a..e) is resolved into its frequency components in the evaluation unit by means of frequency analysis , the frequency components are separated into frequency components of a fundamental oscillation and into frequency components of an superimposed oscillation which cause distortions in the signal, wherein the separated frequency components of the superimposed oscillation which cause a distortion in the signal are inverse transformed in the time domain, and a measure of the wear status and/or the cutting sharpness of a chopping knife is derived from the inverse transformed frequency components of the superimposed oscillation . <EOS>