A method for the contactless measurement of the speed

摘要

A method for the contactless measurement of the speed between a radiation sensitive detector and a product being measured, wherein with the microstructure of the surface of the material to be measured in the hemispherical space above this surface, a rotating synchronously with the measured material moving three-dimensional radiating structure is produced, in that, on the surface of the material to be measured is directed coherent radiation, and the spatial radiating structure on a in this hemispherical space the radiation-sensitive detector as the interference pattern to the effect occurs, characterized in that a focusing element (10) into the beam path between the surface of the material to be measured (3) and the detector (7) is introduced, the detector (7) is neither in the combustion wide plane of the focusing element (10) is positioned in the plane, in which the surface of the material to be measured (3) by means of the focusing element (10) sharply on the detector (7) is imaged and that the measuring range for the speed by changing the distance between the detector (7) and of the fuel wide plane of the focusing element (10) with the conversion factor u..