Light pen tracking system

Abstract

The invention relates to a tracking system applied to a light pen type coordinate measuring machine, aims to solve the contradiction point of a measuring range and system precision in an existing light pen type coordinate measuring machine, and guarantees relatively high measuring precision and greatly increases the measuring range at the same time. The technical scheme that the tracking system adopts is that the light pen tracking system comprises a light pen, a mobile workstation and a digital camera, and a precise two-dimensional rotary table and a control system thereof are added. The precise two-dimensional rotary table includes horizontal and pitching precise transmission mechanisms which are mutually independent, and has a precise reading system which reaches a second level. The rotary table control system is arranged on the mobile workstation, the camera is mounted on the precise two-dimensional rotary table, and both adopt a cable mode to connect and communicate with the mobile workstation; and during measurement, the mobile workstation reads through the rotary table control system two-dimensional rotary table position information transmitted by the precise reading system and controls the two-dimensional rotary table to rotate, thereby enabling the camera to be aligned with the light pen at all times. The tracking system provided by the invention is mainly applied to application occasions of the light pen type coordinate measuring machine.

Description

technical field [0001] The invention relates to a tracking system applied to a light pen type coordinate measuring machine, that is, to a light pen tracking system. Background technique [0002] Three-coordinate measurement technology is an important supporting technology in industrial development and is widely used in manufacturing fields such as automobiles, ships, and aerospace. With the continuous progress of science and technology, modern manufacturing industry is developing towards high quality, high precision, high efficiency and wide range, which puts forward new requirements for measurement technology. It can realize on-line and in-situ measurement, has good portability, high precision, fast dynamic response, and low requirements on the measurement environment, which has become the main direction of the development of measurement technology. As a new type of coordinate measuring machine, the light pen coordinate measuring machine is based on the relevant principles...

AI Technical Summary

Problems solved by technology

However, when the existing light pen type coordinate measuring machine is measuring, because the position and attitude of the camera are fixed, the measurement range is limited within the field of view of the camera, and when the light pen is close to the edge of the field of view of the camera, the lens is distorted Large measurement errors will be introduced, which will seriously affect the system accuracy

Therefore, there is a problem in the actual engineering application of the current optical pen coordinate measurement system, that is, expanding the measurement range will inevitably reduce the system accuracy, and to improve the accuracy, a certain measurement range must be sacrificed

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