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Research on Combined Large-scalemetrology System

Author: ZhongKai
Tutor: WangCongJun
School: Huazhong University of Science and Technology
Course: Materials Processing Engineering
Keywords: Large-scale Metrology Indoor GPS Structure Light Multi-camera
CLC: TH711
Type: Master's thesis
Year: 2009
Downloads: 124
Quote: 4
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Abstract


Large-scale metrology plays a significant role in many fields, such as aerospace manufacture, ship-building and automobile manufacture. However, traditional Large-scale measurement technology is usually complex and time-consuming, sometimes expensive mechanical fixtures would also be employed, so it seriously reduces the production efficiency. To improve this, a new Large-scale measurement method, which combines structure light measurement system (SLMS) with large-scale electro-optical tracking system(LETS),is proposed in this paper. Many SLMSs are taken as measuring ends to obtain pieces of local data, at the same time LETS is used to track the positions and orientations of the SLMSs in the whole space. Then many pieces of local data can be transferred into a coherent coordinate to realize fast Large-scale metrology. As for LETS, this method offers two choices according to measurement scale. One is indoor GPS, the other is multi-camera position system.Indoor GPS gets very high precision in more than 10m measuring scale and the precision will not reduce as increase of measurement space. In this part, the components and basic principle of Indoor GPS was present. And then a comparison was made among many kinds of SLMS and their algorithm to determine which kind of SLMS is most fit to be large-scale measuring end. After that a detailed coordinate transfer process was given and sensors’coordinate value in SLMS coordinate calibration method was proposed.Multi-camera position system also has high-precise in 10m measuring scale but with much lower cost, and this choice has great potential in automobile manufacture. Here much concentration was paid on the multi-camera position principle and multi-camera calibration technology. Because calibration precise will determine the position precise. Then a smart multi-camera calibration method was used and its performance was demonstrated though the experiment.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Measuring instruments > Length measuring instruments
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