Abstract
Laser tracking systems are widely used in large-scale metrology of geometric quantities. Their importance is confirmed by the fact that one of the parts of the ISO 10360 series of standards has been devoted to the issue of assessing their accuracy (ISO 10360-10). A laser tracker is a device whose final measurement result is calculated using indications from various subsystems included in it, such as devices for measuring length and angle. The analysis of these individual impacts can be useful in creating simulation models of accuracy which, in regard to the Industry 4.0 concept, seem to be the most justified in terms of speed of operation and ease of use. For this reason, it may be particularly important to undertake research on the accuracy of this component in isolation from other factors affecting the measurement of the coordinates of the point. The article describes a method that allows separation of the length measurement error from the other components. The method uses a high-accuracy interferometer which is treated as a reference system that allows for the comparison of indications obtained using the tested distance measurement system. Thanks to the proposed method, it is possible to minimize errors from the optical system and other measuring systems. The use of a precise linear guide allows the reduction of errors related to the implementation of linear motion. The article presents the test method and the results obtained from performed experiments, as well as formulates conclusions and the directions of further development.
Highlights
In accordance with the assumptions of the Industry 4.0 concept, increasing production efficiency is to take place, e.g., by optimizing the quality control process [1]
When analyzing the presented results, it should be noted that there is no significant difference in the nature of the error distribution between the errors obtained with active and inactive motors
Comparing the standard deviations (Figure 3) and the ranges (Figure 5), it can be seen that the activation of the motors caused greater values of both parameters, and large values occur at the beginning of the measuring range. It is most likely caused by the beam tracking system, which has the greatest impact on the result at short distances
Summary
In accordance with the assumptions of the Industry 4.0 concept, increasing production efficiency is to take place, e.g., by optimizing the quality control process [1]. Metrology of geometrical values follows this trend by improving both the methods and technology. Part of the geometric values of metrology is coordinate metrology, which has been developing very dynamically since the end of the 20th century. A specific part of this field of science is large-scale metrology, which is used where standard coordinate systems are not able to meet the requirements set for them. Devices with the largest measurement area use laser interferometers in their operation. Skillful use of the phenomenon of wave interferometry, through observation and counting of the interference fringes, allows for performing length measurements in the measurement space of up to several dozen meters
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