Method for non-contact dynamic detection of solid contour

Abstract

The invention relates to a method for contactless dynamic detection of the profile of a solid body (1), wherein at least one light beam which is generated by a laser device (2) and is expanded to form at least one linear light band (3) is projected onto the moving surface of the solid body (1) and the light reflected from the surface of the solid body (1) is focused in an imaging device (5), the optical axis of which is at a fixed triangulation angle with respect to the projection direction of the laser device (2) and which is arranged at a fixed basic distance from the laser device (2), and is detected by means of an areal light recording element (6), after which, from signals emitted by the light recording element (6), in a manner dependent on the triangulation angle and the basic distance, in a data processing device,; by means of trigonometrical relationships and with combination with correction values determined according to the speed of movement of the solid body (1), the measured values of the profile are obtained and stored as a profilogram. It is proposed to perform a determination of initial conditions of the solid body (1) at an initial instant and then to determine a detection instant from the initial conditions.

Description

technical field [0001] The invention relates to a method for the contactless dynamic detection of solids, in particular the contours of moving solids, wherein a laser beam from a laser is projected onto an area of ​​the solid surface in the form of a linear band of light, and Light reflected from it is focused to an imaging device whose optical axis is at a fixed triangulation angle to the laser and placed at a fixed pedestal distance from the laser, and passed through a planar light-receiving element to communicate with the laser. The speed of motion of the solid is detected at a frequency that is high, so that the signal output by the light-receiving element is used in a data processing device as a function of the triangulation angle and the base distance, so that by geometric relationship to obtain measurements of the contour, which are stored as a contour map. Background technique [0002] It is known that detecting the contour of a solid body, that is to say obtaining ...

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Problems solved by technology

[0004] In practice, however, the problem that arises in this case is that the movement of the surface to be measured and the possible curvature cause distortion, which must be counteracted by a correction of the measured value, otherwise the measured value corresponding to the real situation will not be obtained

[0005] In this case, the moment of detection of the measured value also plays an important role, since an incorrect choice of this moment can lead to the measured value being no longer plausible even after correction

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