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Proceedings Paper

Laser measurement for slight deformation of a large-scale structure
Author(s): Yaxing Yi; Zhongke Li; Xinshe Li; Fanglin Deng
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Paper Abstract

This article is to introduce the outline of our newly developed method of laser measurement for slight deformation of large-scale building or structure, which we call the automatic inspection for the six-degree-of-freedom movement-deformation of distributed interconnected measure-points. The basic principle is described as below: A certain number of measure-points are settle on the building that is waiting for inspection. In all measure-points, we select one as a datum point. For every two connected measure- points, we measure their relative displacement of six-degree-of- freedom, then, we calculate out the relative displacement of six- degree-of-freedom for every measure-point to datum point. By this way, we can know the deformation of the building. The measuring method of relative displacement for every two connected measure-points is presented as below: An indium steel pipe, which acts as a length rod and a displacement sensor, are used to inspect the distance of the two measure-point. A collimating laser beam and a two-dimensional PSD are used to inspect the other two dimensional linear displacement. A collimating laser beam, a reflector and a one-dimensional PSD are used to inspect the relative rotation in horizontal plane. A high precision photoelectric tiltmeter which is especially developed for this purpose is used to inspect the other two dimensional angular displacement. All those measurement are controlled by a central computer, and full automatic.

Paper Details

Date Published: 9 October 2000
PDF: 4 pages
Proc. SPIE 4221, Optical Measurement and Nondestructive Testing: Techniques and Applications, (9 October 2000); doi: 10.1117/12.402629
Show Author Affiliations
Yaxing Yi, Second Artillery Engineering College (China)
Zhongke Li, Second Artillery Engineering College (China)
Xinshe Li, Second Artillery Engineering College (China)
Fanglin Deng, Second Artillery Engineering College (China)


Published in SPIE Proceedings Vol. 4221:
Optical Measurement and Nondestructive Testing: Techniques and Applications
FeiJun Song; Frank Chen; Michael Y.Y. Hung; H.M. Shang, Editor(s)

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