Patent ID: 8064047
Filing Date: 2011-11-22
Classification: G01B

Abstract:
1. A method for contactless determination of the lateral offset relative to a straight-ahead direction when an object moves relative to an object with a stochastic surface structure with imaging of the surface structure on a photosensor, wherein: the surface structure is imaged on at least two similar sensor elements on the moving object arranged one behind the other at a defined separation in the straight-ahead direction, said sensor elements having a spatially resolving longitudinal extent transverse to the straight-ahead direction; a spatial frequency signal corresponding to the surface structure is generated by the sensor elements; the spatial frequency signal of a sensor element which is second in the movement direction is read, temporally shifted relative to the spatial frequency signal of the first sensor element such that the same, at least partially overlapping, surface structure is imaged on both sensor elements, and the spatial frequency signals of the first and second sensor elements are correlated with one another to determine a correlation coefficient, and the size of the lateral offset of the correlated spatial frequency signals from one another on the spatially resolving sensor elements is determined from the correlation coefficient.