Laser line scanning feeler geometric transformation calibration and curved face interpolation correcting method and apparatus

A technology of geometric transformation and scanning probe, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of complex relationship mapping, large difference in accuracy, and difficulty in guaranteeing interpolation accuracy.

Inactive Publication Date: 2008-12-31
XI AN JIAOTONG UNIV
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Problems solved by technology

The former is difficult to construct interpolation, and the calculation is more complicated. The key is that the interpolation accuracy is difficult to be guaranteed in the case of limited calibration points; the latter is difficult to expre

Method used

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  • Laser line scanning feeler geometric transformation calibration and curved face interpolation correcting method and apparatus
  • Laser line scanning feeler geometric transformation calibration and curved face interpolation correcting method and apparatus
  • Laser line scanning feeler geometric transformation calibration and curved face interpolation correcting method and apparatus

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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0041] see figure 1 , and the two figures respectively show the principle of laser line scanning geometric triangulation imaging in the XOY plane and YOZ plane when the laser is vertically incident. Such as figure 1 As shown in a, ideally, in the XOY plane, the image triangle and the object triangle form a similar triangle, and the corresponding side lengths are proportional, so the spatial displacement in the XOY plane of the measured point is proportional to the image displacement of the corresponding imaging point relation.

[0042] And in the YOZ plane, such as figure 1 As shown in b, there is a nonlinear relationship between spatial displacement and image displacement. According to the triangular sine principle, the relevant parameter relationship can be obtained as follows:

[0043] Δ ...

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Abstract

The invention discloses a method for the geometric transformation calibration and the curved surface interpolation modification of a laser line scanning probe, and a device; the noncontact measurement technology is adopted to be used for the accurate calibration and further modification of the probe of a laser line scanning three-dimensional profile measuring system; the method carries out calculation on the basis of the basic measuring principle of a probe system and completely eliminates calibration theory errors brought by the traditional calibration method (such as a polyfit calculation method, etc.). In the detailed parameter calculating process, the statistical analysis technologies of curve analysis and least squares, etc., are adopted by the algorithm; therefore, the requirement of multiscale calibration caused by the related factors of lens distortion, probe assembly and adjustment error, etc. to different calibration areas is fully considered on the basis that the basic principle is fully met, thus leading the probe to have excellent stability and operability.

Description

technical field [0001] The invention relates to a method and device for geometric transformation calibration and curved surface interpolation correction of a laser line scanning measuring head. Background technique [0002] The laser line scan probe adopts the mature optical triangulation principle to realize the three-dimensional contour scanning measurement of the measured object. The linear laser emits a laser plane, and the laser light hits the surface of the measured object, and the light formed on the surface of the measured object is reflected, and part of it is imaged on the imaging plane of the area array CCD through the CCD imaging lens, and the laser reflection image is captured by the computer through the image acquisition card. collection. As the height of the measured object changes, the collected images also change. That is to say, the laser reflection image collected by the CCD contains the height information of the measured object. [0003] At present, the...

Claims

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Application Information

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IPC IPC(8): G01B11/24
Inventor 蒋庄德丁建军李兵陈磊
Owner XI AN JIAOTONG UNIV
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