Line-shaped laser vertical rotation type three-dimensional appearance measuring apparatus and method thereof

Abstract

The invention relates to a device and a method for measuring a horizontal laser vertically rotary three-dimensional shape, and belongs to the technical field of computer vision measurement. The device comprises a base, a camera, a horizontal laser, a motor, a rotational axis, an angle measuring element, a driving circuit, a switching circuit and a controller, wherein the camera and the horizontal laser are fixedly connected with the rotational axis of which a central line is positioned in a laser plane of the horizontal laser; the included angle between an observation plane formed by the central line of the rotational axis and a focal center of a lens and the laser plane is between 80 and 100 DEG; and the included angle between the central line of the rotational axis and an optical axis of the lens is between 40 and 50 DEG. The device can detect edge information in various directions, realize high-precision measurement of the three-dimensional shape of object surfaces, and avoid the inconvenience caused by rotation of objects in the prior method, has a simple structure, low cost and high measurement precision, and is suitable for surface detection of the objects with various dimensions.

Description

technical field [0001] The invention relates to a measuring device and method for a three-dimensional shape of an object, in particular to a three-dimensional shape measuring device and a method thereof with a laser vertical rotation. The invention belongs to the technical field of computer vision measurement. Background technique [0002] The three-dimensional shape measurement technology of the object is very important. In the process of manufacturing or maintenance, for some products with irregular curved surfaces, especially some products that are not convenient for contact measurement or direct manual measurement, three-dimensional shape measurement is required. The shape measurement device realized by a line laser and a camera not only has the advantages of fast, accurate, high resolution, and good anti-interference, but also has a simple structure, economy, and easy implementation, and has been used in practice. [0003] Most of the traditional line-structured light ...

AI Technical Summary

Problems solved by technology

The parallel scanning measurement method implemented by this method has serious shortcomings: the measurement accuracy of the fringe with a fixed direction is poor for the edge information close to this direction, and the measurement accuracy gradually deteriorates as the angle between the measured edge and the laser fringe decreases. Almost undetectable for stepped edges parallel to the stripe direction

The device rotates on a straight line approximately parallel to the surface of the object to realize the parallel scanning of the linear laser stripes. This device is still a parallel scanning method similar to the aforementioned linear moving scanning measurement method, and has the same shortcomings. : For edge information close to the stripe direction, a large error will be generated, or even not detected

The disadvantage of this device is that the device must place the object to be measured on the CNC rotary table, and the CNC rotary table drives the object to rotate, so as to realize the measurement of different angles and directions on the surface of the object. This measurement method is not suitable for large-scale Object measurement: On the one hand, it is very expensive to manufacture a CNC rotary table that can withstand heavy loads and large-sized objects, and it is inconvenient to hoist; on the other hand, the device cannot be placed inside a large-sized object for measurement

The disadvantages of this device are: the raster scanning head used in the device has a complex structure and high cost; the mechanical arm with multi-rotation joints has a complex structure and high cost, and at the same time, due to many moving parts, large measurement errors are introduced, making it difficult to ensure Accuracy; the cost of the binocular camera used is high

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