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Method and device for measuring three-dimensional topography of surface of moving object

A technology of moving objects and measurement methods, applied in the direction of measuring devices, optical devices, instruments, etc., to achieve high precision, eliminate measurement errors, and prevent distortion

Inactive Publication Date: 2009-12-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can only be used to measure the three-dimensional shape of an object moving at a uniform speed, and can only accurately obtain the three-dimensional information of the object surface on the line array light strip, which is not a real full-field measurement

Method used

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  • Method and device for measuring three-dimensional topography of surface of moving object
  • Method and device for measuring three-dimensional topography of surface of moving object
  • Method and device for measuring three-dimensional topography of surface of moving object

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Embodiment Construction

[0012] figure 1 It is a structural schematic diagram of an embodiment of a three-dimensional measuring device for the surface topography of a moving object in the present invention. The measuring device is composed of an optical projector 1, a lens 2, a line scan camera 3, an image acquisition card 4, a rotational speed encoder 5 and a computer 6.

[0013] The digital cosine light emitted by the projector 1 enters the lens 2, and the parallel digital cosine grating emerges from the lens 2 to reach the surface of the object 7 to be measured, and the projection angle is 30 degrees. The line scan CCD camera 3 is used to take pictures of deformed fringe patterns, and its optical axis is perpendicular to the surface of the object 7 to be measured. When the object moves relative to the measuring system, a rolling wheel is installed on the shaft of the encoder 5, and the rotational speed of the rolling wheel is guaranteed to be the same as the moving speed of the object through frict...

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Abstract

The invention discloses a method and a device for measuring three-dimensional topography of the surface of a moving object; the method is as follows: cosine grating is projected to the surface of the moving object to be measured; a line-scanning camera is adopted for shooting a deforming stripe map of the surface of the object; the three-dimensional information of the surface of the object is calculated according to phase position variable quantity of the deforming stripe map; the scanning frequency of the line-scanning camera is regulated in real time according to the speed of the moving object. The device realizing the method puts a speed coder on the surface of the object to be measured; the speed coder transmits collected speed to a computer; the scanning frequency of the line-scanning camera is controlled by the computer. The invention adjusts the scanning frequency of the camera in real time so as to realize the matching between the scanning frequency and the moving speed, thus effectively eliminating measuring errors caused by the variation of the moving speed in a dynamic measuring process, realizing the full-field topography measurement of the surface of the variable speed moving object. The invention has the advantages of fast measuring speed, high precision and image seamless connection.

Description

technical field [0001] The invention relates to the technical field of non-contact optical three-dimensional shape measurement, in particular to a full-field measurement method and device for three-dimensional shape of the surface of a moving object. Background technique [0002] Non-contact optical three-dimensional shape measurement technology has broad application prospects in industry and engineering. At present, it is mainly used in the measurement of surface topography of static objects, see Chinese patent documents CN101113894, CN1051975, CN1256414, CN1508514, CN1888817, etc. However, in the process of industrial inspection, it is often required to realize online detection of the three-dimensional surface topography of moving objects. This case is characterized by relative motion between the object and the measuring system, with varying speeds of motion. For example, on-line detection of steel plate surface defects in iron and steel enterprises, health status detecti...

Claims

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Application Information

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IPC IPC(8): G01B11/25
Inventor 何玉明胡而已
Owner HUAZHONG UNIV OF SCI & TECH
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