Laser linear scanning three-dimensional measurement double liquid knife virtual grid mapping calibrating method and equipment

A technology of three-dimensional measurement and virtual grid, applied in the direction of measuring device, optical device, image data processing, etc., can solve problems such as inability to fit, relationship cannot be accurately determined, and the actual situation is complicated

Inactive Publication Date: 2002-06-19
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] 3) The calibration steps in the two directions of the above two methods are isolated, and the mathematical model used as the premise of calibration is ideal, but the actual situation is much more complicated
[0010] i) The relationship between the standard plane coordinate system and the measurement system coordinate system cannot be accurate

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  • Laser linear scanning three-dimensional measurement double liquid knife virtual grid mapping calibrating method and equipment
  • Laser linear scanning three-dimensional measurement double liquid knife virtual grid mapping calibrating method and equipment
  • Laser linear scanning three-dimensional measurement double liquid knife virtual grid mapping calibrating method and equipment

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Embodiment Construction

[0035] The structural principle, working principle and specific steps of calibration of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] see figure 1, the present invention includes a central processing unit 1, a controller 14, a test base 9, and the test base 9 is provided with a gantry type vertically distributed X-axis translation guide rail 2, a Y-axis translation guide rail 13 and a Z-axis translation guide rail 3, X, Both the Y and Z axes are equipped with drive positioners, such as stepper motors or servo motors, grating rulers or photoelectric encoder disks, etc.; the lower end of the Z-axis translation guide rail 3 is connected to the photoelectric measuring head 6, and the middle part of the photoelectric measuring head 6 An adjustment device 5 is fixed, and a measurement light knife generator 7 is fixed on the lower end of the adjustment device 5, and the measurement light knife generator 7 can be adjus...

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Abstract

The invnetion discloses a method and set for calibrating the mapping of virtual grid by using double light-knifes in three-dimension measure of laser line scanning. The set includes central processing unit, controller, measuring base stage, translating slide guides, photoelectric measuring head and standard flat plate. There are three slide guides along X, Y, Z, axes, and said measuring head is installed on the lower end of Z-axis. The standard flat plate is on the surface of base stage. The virtual grid builds up the relationship of mapping function between two-dimension imaging space and two-dimension physical space, so as to realize accurate calibration of measuring system. When measuring is carried on, the coordinate values of physical space that is relevant to each imaging point on measuring light-knifes can be measured. With scanning by the photoelectric measuring head going on, the information of three-dimension contour of surface of object measured can be obtained.

Description

1. Technical field [0001] The invention belongs to a method and device for three-dimensional profile measurement, in particular to a laser line scanning three-dimensional measurement double-light knife virtual grid mapping calibration method and device. 2. Background technology [0002] At present, in the laser line scanning three-dimensional contour measurement system, the measurement principle adopted is the triangulation method, that is, the three-dimensional information of each point of the contour of the measured object is determined through the triangular geometric relationship between the exit point, the projection point and the imaging point. . The measurement system generally adopts the method of laser vertical incidence and CCD vertical imaging. In the laser vertical incidence, the linear light source formed by the laser (hereinafter referred to as the light knife) is vertically incident on the base plane where the workpiece to be measured is placed. CCD vertical ...

Claims

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Application Information

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IPC IPC(8): G01B11/24G06T15/00
Inventor 蒋庄德李兵田世杰隋连升罗意平韩涛陈伟
Owner XI AN JIAOTONG UNIV
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