Linear laser three-dimensional measuring device calibration and error compensation method
A technology of three-dimensional measurement and error compensation, which is applied in the direction of measuring devices, optical devices, instruments, etc., to achieve the effects of improving accuracy, simple calibration and error compensation methods, and reducing measurement errors
Active Publication Date: 2018-01-09
SOUTH CHINA UNIV OF TECH +1
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[0004] The purpose of the present invention is to provide a calibration and error compensation method for a line laser three-dimensional measuring device, aiming at solving the problems of calibration of the motion direction in the line laser three-dimensional measuring device and compensation of measurement errors by using the calibration results
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[0031] A calibration and error compensation method for a line laser three-dimensional measuring device, comprising the following steps:
[0032] S1, such as figure 1 As shown, the line laser scanner 3 is installed on the slider of the linear motion module 1, and the linear motion direction 2 is roughly parallel to the normal direction 4 of the measurement plane of the line laser scanner. There is a target ball 5 within the measurement range of the line laser scanner, and the measurement plane of the line laser scanner 3 intersects with the surface of the target ball to obtain a set of arc discrete point data D 0 , and record the initial position L of the current line laser scanner 3 on the linear motion module 1 0 . Drive the linear motion module 1 to drive the line laser scanner 3 to move a certain distance along the linear motion direction 2, and the measurement plane of the line laser scanner 3 always keeps intersecting with the surface of the target ball 5. In each meas...
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The invention discloses a linear laser three-dimensional measuring device calibration and error compensation method which includes the following steps: acquiring multiple sets of arc data of the surface of a target ball scanned by a linear laser scanner and the linear motion distance of each set of arcs relative to an initial arc; getting a plurality of centers through fitting according to the multiple sets of arc data; calculating the unit direction vectors of the connecting lines between the center corresponding to the initial arc and the other centers; averaging the unit direction vectors to get a linear motion direction vector as a calibration result; and making compensation for the measurement error of a laser three-dimensional measuring device according to the calibration result. Themeasurement error of the three-dimensional measuring device caused by parts manufacture and installation error is reduced, and the accuracy of the measurement result is improved. Moreover, the calibration and error compensation method is simple, and is suitable for calibration and measurement in a processing site.
Description
technical field [0001] The invention relates to a calibration and error compensation method for a line laser three-dimensional measurement device, in particular to a measurement direction calibration method for a line laser three-dimensional measurement device and a measurement error compensation method based on the calibration result. Background technique [0002] With the development of science and technology, NURBS-based geometric modeling tools and high-precision CNC machining technology have realized the design and manufacture of complex special-shaped surface workpieces. However, due to the lack of accurate and referenceable measurement benchmarks for special-shaped surface workpieces, the traditional size comparison measurement mode It is difficult to implement in the manufacturing error evaluation of workpieces with special-shaped surfaces. Line laser three-dimensional measurement has been widely used in online measurement of workpieces with special-shaped surfaces d...
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IPC IPC(8): G01B11/24
Inventor 张铁
Owner SOUTH CHINA UNIV OF TECH