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Calibration method for measuring head center position in light pen-type portable three-coordinate measuring system

A technology of three-coordinate measurement and calibration method, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of limited probe calibration data and no valuable reference materials

Inactive Publication Date: 2012-07-18
TIANJIN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Although there are relatively mature products abroad, the information on probe calibration is very limited. Since the research on the light pen three-coordinate measurement system in China is still in its infancy, there are almost no valuable reference materials.

Method used

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  • Calibration method for measuring head center position in light pen-type portable three-coordinate measuring system
  • Calibration method for measuring head center position in light pen-type portable three-coordinate measuring system
  • Calibration method for measuring head center position in light pen-type portable three-coordinate measuring system

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Embodiment Construction

[0045] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0046] This scheme can realize the calibration of the center position of the light pen probe in the light pen portable three-coordinate measuring system, among which figure 1 The light pen type portable three-coordinate measuring system shown in the figure is composed of the light pen, CCD camera and computer shown in the figure. The camera is a Basler industrial black and white camera, and the camera has been calibrated before the probe calibration.

[0047] The specific implementation process is:

[0048] (1) According to figure 1 As shown, set up the system and fix the relative position of the camera and the standard cone, place the light pen probe in the vertebral hole of the standard cone, light up the LED light target control point, and prepare to start the calibration work.

[0049] (2) if figure 2 As shown, the light pen is manually op...

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Abstract

The invention discloses a calibration method for a measuring head center position in a light pen-type portable three-coordinate measuring system. In the method, a light pen measuring head is put into a standard cone; a light pen is rotated slowly; after images are captured by a charge coupled device (CCD) camera and are transmitted to a computer for processing, a rotation translation matrix of a light pen coordinate system and a camera coordinate system is obtained; and because the standard cone and the CCD camera are fixed relatively, and moreover, the light pen per se is a rigid object, the coordinates of the measuring head center in the light pen coordinate system are solved by an algorithm according to the position invariance of the measuring head center in the light pen coordinate system and the camera coordinate system. By the method, the calibration of the measuring head center position in the light pen-type portable three-coordinate measuring system can be realized rapidly and accurately on the measurement scene.

Description

technical field [0001] The invention relates to the field of contact-type visual three-coordinate measurement, in particular to a method for calibrating the center position of a measuring head in a light-pen type portable three-coordinate measurement system. Background technique [0002] Three-coordinate measurement technology plays a very important role in industrial production, mainly divided into two types: contact type and non-contact type. Contact measurement is to obtain the shape information of the measured surface by contacting the probe with the surface of the measured object. The representative measurement tool is the three-coordinate measuring machine. This measurement method has high precision, but the efficiency is relatively low, and the measurement range is also limited. Relatively small. Non-contact measurement mainly uses laser equipment or CCD camera to detect the surface of the measured object, combined with image processing technology to obtain the shape...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
Inventor 刘书桂汤莎亮董英华
Owner TIANJIN UNIV
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