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Single-shaft translation table and structural light 3D sensor combined measurement calibration method

A calibration method and sensor technology, applied in the field of visual measurement, can solve problems such as the inability to guarantee high-precision measurement

Active Publication Date: 2019-11-15
DALIAN UNIV OF TECH
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Problems solved by technology

This method does not guarantee high precision measurements

Method used

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  • Single-shaft translation table and structural light 3D sensor combined measurement calibration method
  • Single-shaft translation table and structural light 3D sensor combined measurement calibration method
  • Single-shaft translation table and structural light 3D sensor combined measurement calibration method

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Embodiment Construction

[0040] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions.

[0041] In the embodiment, the structured light 3D sensor 1 translates with the single-axis translation platform 3, but there is an included angle between the movement direction of the single-axis translation platform 3 and the three coordinate axes of the measurement coordinate system. In high-precision measurement, this included angle It cannot be ignored, it must be considered. In the calibration method of single-axis translation stage and structured light 3D sensor, what needs to be solved is the cosine value of these three included angles.

[0042] The structured light 3D sensor 1 has high resolution in the X, Y, and Z directions, and the selected target ball is a matte ceramic standard target ball with moderate reflection effect, so the collected point cloud data usually has high precision and Reliability, ...

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Abstract

The invention relates to a single-shaft translation table and structural light 3D sensor combined measurement calibration method, belongs to the field of visual measurement and relates to the single-shaft translation table and structural light 3D sensor combined measurement calibration method. The method comprises the steps of translating a structural light 3D sensor to a designated position by asingle-shaft translation table to obtain translation distance; maintaining the structural light 3D sensor in static gesture under different positions, shooting a standard ceramic ball, and acquiring surface point cloud data of the ceramic ball; fitting spherical point cloud data to obtain three-dimensional space coordinate of a ball center of a target ball under a measurement coordinate system; completing high-accuracy calibration of the standard ceramic ball by a three-coordinate measurement machine; and deriving to obtain three calibration parameters to complete calibration according to ballcenter three-dimensional space coordinate obtained by calculation under at least three different positions and translation distance of the structural light 3D sensor. By the method, the application structure of the structural light 3D sensor is effectively expanded, the used calibration structure is simple and is low in cost, and the promotion of the method is convenient.

Description

technical field [0001] The invention belongs to the field of visual measurement, and relates to a joint measurement and calibration method of a standard ceramic ball-based single-axis translation platform and a structured light 3D sensor. Background technique [0002] The development of the industrial field has put forward higher and higher requirements for measurement technology, and high-precision scanning measurement of the surface of parts is an extremely important part of it. Various types of measurement problems such as surface profile, workpiece clearance, three-dimensional topography, and surface defects place high demands on the accuracy and convenience of the measurement method. Among the existing measurement technologies, structured light scanning measurement has the advantages of fast, high precision, flexible and convenient use, simple equipment structure, small size, light weight, non-contact and other measurement advantages, so it is gradually popularized in i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
CPCG01B11/005
Inventor 刘巍武琼周志龙张洋程习康马大智刘思彤贾振元
Owner DALIAN UNIV OF TECH
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