Multi target automatic recognition and measurement for efficient application of laser tracker

Measurement and application of Laser Tracker

Laser tracker is a large-scale spatial coordinate measurement equipment. It has been widely used in the measurement and detection links of high-end manufacturing fields all over the world. It plays an irreplaceable role in the fields of high-precision measurement of static points, dynamic trajectory monitoring, splicing alignment, assembly positioning and so on.

In the traditional measurement mode, the operator usually holds the target ball (SMR) with built-in prism, leads the laser tracker that locks the laser beam to the center of the target ball to the position of the target to be measured, and uses the target ball to touch the position to be measured. The laser tracker then measures the three-dimensional data of the measurement position and feeds back and records it in the software for later comparative analysis or digital modeling.

In addition to the target ball, the laser tracker is usually equipped with hidden point probe, laser line scanning probe and other functional expansion accessories to expand the data acquisition range of the tracker and improve the data acquisition efficiency, providing a high-quality guarantee for industrial and laboratory precision measurement.

As the inventor of the laser tracker, API not only provides high-quality hardware guarantee for the laser tracker, but also develops many practical functions, software and methods for the application of the laser tracker, further expands the application field of the tracker, realizes many measurement and detection operations that are difficult to realize and difficult to guarantee the accuracy, and takes into account accuracy and efficiency.

Multi target automatic measurement of laser tracker

Multi target automatic measurement is a representative practical measurement function of laser tracker developed by API.

This function uses the ivision artificial intelligence active vision system of radian pro, the flagship model of API laser tracker, which provides a feasible way to realize accurate and automatic measurement for tasks that are not convenient for personnel to contact the position to be measured in the actual measurement operation.

The Radian Pro Laser Tracker is integrated with an active vision system, which can observe multiple targets (target balls) at the same time within the field of view. It can be automatically executed under the instruction of the operator or pre programming, and identify and measure the selected targets according to the planned time point or sequence. (as shown in Figure 1)


Measurement case

Research topic of a unit: it is necessary to load weights of different weights at different positions of the workpiece, realize balance, and monitor the change of six degrees of freedom of the workpiece.


According to the measurement requirements of this subject, using the laser tracker, under the traditional measurement mode, different targets on the workpiece can be measured manually, and the change information of six degrees of freedom of the workpiece can be calculated; However, using the traditional mode takes a long time. The actual measurement of a single weight takes more than 3 minutes, and hundreds of groups of data are required for the whole operation. If the traditional mode is used, it will be difficult to ensure the efficient implementation of the whole operation.

The application of multi-target automatic identification and measurement function of radian Pro laser tracker not only ensures the high precision of the whole measurement operation, but also takes into account the high efficiency of operation implementation.

During the operation, the laser tracker and the set points are placed (as shown in Figure 2). By using the ivision active vision system of radian Pro laser tracker and the multi SMR multi-target ball recognition function, combined with the SDK development package jointly developed with the application unit, it is realized that when the weight loading is completed, Trigger the multi-target ball recognition function of the laser tracker to automatically measure the points arranged on the workpiece one by one, and calculate the change of six degrees of freedom through the matrix algorithm for subsequent analysis and compensation.

Practical effect: using the characteristics of the equipment, 90% of the measurement time is saved, and the influence of man-made holding the target ball on the measurement results is effectively avoided.

Finally, through comparison, the angle accuracy is controlled within 0.01 ° and the spatial position accuracy is controlled within 0.03mm, which realizes the research purpose of this subject.

conclusion

The radian Pro laser tracker integrated with ADM / IFM dual lasers, supported by the artificial intelligence application of ivision active vision system, provides a perfect scheme for the application requirements of workpiece multi position automatic identification and measurement.

In addition to multi-target automatic identification and measurement, API has also developed many practical high-level application functions or accessories for its laser tracker, such as "accurate measurement of high-speed moving targets", "linkage Networking Measurement of multiple laser trackers", "extreme high-precision measurement of multiple laser trackers at a single position" and "STS sensor 6DOF dynamic measurement" (as shown in Figure 3). Please contact API local offices for details.