A Method of Plane Normal Vector Measurement Based on Laser Tracker

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 method for measuring a plane normal vector based on a laser tracker, belonging 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 precision measurement, installation and calibration of large parts and components. The laser tracker works in the spherical coordinate system, and measures the position, attitude and other characteristics of the measured object by cooperating with the target ball. In the measurement, the distance of the target ball is measured by the principle of laser interferometry, and the pitch angle 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, etc., plane positioning is often used, and the normal vector of the plane needs to be measured. However, for large parts, th...

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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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