METHOD AND SENSOR FOR OPTICAL MEASUREMENT OF VELOCITIES ACCORDING TO THE SPATIAL FREQUENCY FILTERING METHOD

摘要

The invention relates to a method for measuring a velocity of an object surface (O) relative to a sensor (1) with at least one light-sensitive element (2) according to the spatial frequency filtering method, wherein the light-sensitive element (2) is read at time intervals, and wherein the spatial frequency filter is designed as at least one masking grating having a variable grating constant. The method according to the invention is characterized in that the relative velocity is first measured using a first grating constant k1 having a large period length and/or over a short observation time period t1 (rough measurement) and then the measurement of the relative velocity is repeated for a more exact determination using a second grating constant k2 having a small period length and/or over a long observation time period t2 (fine measurement). The invention further relates to a sensor for velocity measurement.