Patent ID: 7584663

Claim:
A method of determining the content of a desired component in a stream of material including two or more types of component, comprising the steps of: causing the stream, comprising plural particles of material, to impact a sensor member located in a path of the material thereby inducing vibration of the sensor member; analysing vibrations of the sensor member and from the analysis determining whether individual impacts caused by the stream are one of any two or more types selected from three possible impact types, wherein the three impact types are grain impacts, straw impacts and straw tip impacts; and performing an operation based on the result of the analysis, wherein the step of performing an operation includes the steps of generating a grain loss signal indicative of the amount of grain in the stream and a MOG signal that is indicative of the amount of material other than grain (MOG) in the stream, and correcting the grain loss signal in dependence on the MOG signal.