Plane normal vector measurement method based on laser tracker

A technology of a laser tracker and a measurement method, applied in the field of digital measurement, can solve problems such as low measurement accuracy, and achieve the effect of improving measurement accuracy

Active Publication Date: 2018-07-31
TSINGHUA UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for measuring plane normal vectors based on laser trackers. Aiming at the problem that the measurement accuracy of laser trackers for plane normal vectors is low when the measurement distance is relatively long, the existing measurement methods are improved to improve the measurement accuracy. precision

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  • Plane normal vector measurement method based on laser tracker

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Embodiment Construction

[0028] The method for measuring a plane normal vector based on a laser tracker proposed in the present invention includes the following steps:

[0029] (1) Place the measured plane within the measurement range of the laser tracker, adjust the posture of the measured plane by visual inspection, so that the normal vector direction of the measured plane is nearly parallel to the measurement light direction of the laser tracker, and turn on the laser tracker;

[0030] According to the model of the laser tracker, the measurement range is different, generally: the horizontal angle of the measured plane: 180°-180°, the elevation angle of the measured plane -45°-45°, the distance between the laser tracker and the measured plane Distance 0-80m;

[0031] (2) Set three measuring points on the measured plane, fix the measuring target ball on the first measuring point, make the laser tracker measure light trace to the measuring target ball, click the "measure" button of the laser tracker to start...

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Abstract

The invention relates to a plane normal vector measurement method based on a laser tracker, and belongs to the technical field of digital measurement. The object of the invention is to improve the measurement accuracy of the prior art, and to provide a method for measuring a plane normal vector at high precision. The laser tracker is a high-precision and large-scale measuring instrument, operatesin a spherical coordinate system with a tracking head as the origin, and measures the position and posture of a measured object in cooperation with a target ball. The plane normal vector measurement method can be applied to the fields of positioning and installation of large components, machine tool calibration and the like. In combination with a characteristic that the laser tracker has high measurement precision along a light direction and the characteristic that the vertical plane direction error in the plane normal vector fitting has the greatest influence on the plane normal vector fitting precision, a laser tracker measurement light is close to be parallel with the plane normal vector direction by visual adjustment before the measurement, which improves the measurement accuracy of the plane normal vector.

Description

Technical field [0001] The invention relates to a plane normal vector measurement method based on a laser tracker, which belongs to the technical field of digital measurement. Background technique [0002] Laser tracker is a high-precision, large-scale measuring instrument, which is widely used in fields such as precision measurement of large parts and components, installation and calibration. The laser tracker works in the spherical coordinate system, and measures the position and posture of the measured object through cooperation with the target ball. In the measurement, the distance of the target ball is measured by the principle of laser interference, and the pitch and horizontal angle of the target ball are measured by two angle encoders. [0003] In the fields of machine tool calibration, installation and positioning of large parts, plane positioning is often used, and the plane normal vector needs to be measured. However, for large parts, the space size is relatively large...

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/00G01B11/002
Inventor 徐静陈恳万安吴丹王国磊张继文宋立滨
Owner TSINGHUA UNIV
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