Data splicing technology for measuring flatness of super large plane

Abstract

The invention relates to a data splicing technology for measuring the flatness of a super large plane. Based on a laser alignment scanning method, a measured plane with an obstacle or the super large plane is partitioned into a plurality of sub areas with a common area and then the sub areas are measured, the measurement result is processed by using a data splicing method, the flatness error is evaluated according to the evaluation criteria and methods of the flatness error, and the flatness error value of the whole plane can be acquired, so that quick measurement of the super large plane and the plane with the obstacle is realized. The method comprises the following steps of: 1, dividing the measured plane into the plurality of sub areas with the common area; 2, measuring the sub areas by using the laser alignment scanning method respectively; and 3, after all the sub areas are measured, normalizing the measurement data. By the technology, the flatness measurement of the large plane and the plane with the obstacle is realized, the defects of long measurement time, incapability of measuring the flatness of an inclined plane and the like in a liquid level method are overcome, and the measurement speed is improved.

Description

Technical field [0001] The data splicing technology used for measuring the flatness of a super-large plane according to the present invention relates to a measurement technology, in particular to a flatness measurement technology of a super-large plane and a plane with obstacles. Background technique [0002] At present, in the manufacturing process of ships, it is necessary to measure the flatness of bases with large geometric dimensions (hundreds of meters) and obstacles. Liquid surface method and laser collimation scanning method are the most commonly used flatness measurement methods. The liquid level method mainly uses the liquid surface as the measurement reference surface, which can realize the flatness measurement of large planes and planes with obstacles. Two metal containers filled with liquid are used to form a connector, one of which is fixed in position, and the other is placed on each measuring point in the order of measurement to measure the height difference betwe...

AI Technical Summary

Problems solved by technology

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to research and design a new type of data splicing technology for measuring the flatness of super-large planes, so as to solve the problems of long measurement time, liquid temperature, etc. The influence of environmental factors is relatively large and the shortcomings of the inability to measure the flatness of inclined surfaces; and the laser collimation scanning method exists for large-scale planes with obstacles, because the laser beam cannot go around obstacles, and flatness measurement cannot be realized

For the flatness measurement of super-large planes, due to the limitation of use safety, the energy of the laser beam cannot be too large, and the laser cannot effectively scan the entire large plane, and the flatness of the entire large plane cannot be measured at one time.

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