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The Study on Three Coordinate Laser Measuring Technology

Author: JiangDong
Tutor: LinWenQiang
School: Northeastern University
Course: Mechanical Design and Theory
Keywords: Point cloud NURBS The laser measuring machine Non-linear compensation The controlling by surface of the object IGES
CLC: TH721
Type: Master's thesis
Year: 2005
Downloads: 452
Quote: 1
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Abstract


The three coordinate measuring machines, as a kind of measuring instrument, become an indispensable part and are more and more applied to manufacture, electron, automobile and spaceflight, etc. Since 1960s, the three coordinate measuring technologies have gradually grown up. Now, it trend toward the non-contact-type with high efficiency and high accuracy.The three coordinate laser measuring machine as the object of this article, it’s control system, measure modeling, sampling and dealing with data and data’s interchanging interface are mainly researched in this article. Some practical and feasible theories and methods based on practice are put forward in order to improve the measuring efficiency and precision.In respect of measure modeling, two modes are given and analyzed in this article, data point clouds and remodeling based on curve. Then it makes integral programming in the course of the whole measurementIn respect of the control system, in the light of the rotation-working-desk-type and non-contact laser measuring apparatus, This article puts forward to use the whole control scheme of location going to machine, and the scheme of compensating to error is also proposed in this article; Moreover, in order to further improve measuring efficiency and precision, it suggests the profile modeling follows the principle of controlling and implementation methods in controlling.In respect of the laser measuring machine’s characteristic, this article offers revision method of examining-data by experiment and dealing with some linearization, for the inherent nonlinearity of the laser measuring machine; and from the angle of experiment. It analyses and concludes the relation between the speed of scanning and the shape of examining-surface, for the dynamic characteristic in the course of measuring of the laser measuring machine.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Coordinates,computer tools,the counter > Coordinates and automatically coordinates
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