一种适用于无特征空间曲面毛坯件的激光测量系统

A Laser Inspection System for Blanks of Anonymous Space Surface

提出一种适用于无特征空间曲面毛坯件的激光测量系统及其检测方法。受3D扫描技术的限制,成形后的毛坯件须进行多次扫描,获得在不同坐标系下的多组点云数据,随后通过拼接算法完成拼接。通过将毛坯件理论数模与点云数据对齐,可对关键尺寸数据进行分析比较,也可全面分析毛坯件的尺寸精度,并据此分析质量问题原因。利用柔性支架对不同毛坯进行了吸附定位,可将系统用于多种不同毛坯件的测量和定位工作。实现了测量和定位匹配过程的数字化、自动化;还具备高柔性的特点,能够适用于不同毛坯件的测量和定位。再者,有效消除了由于人工测量带来的偏差,无需定制每个毛坯件的"靠模",降低了成本。

A laser scanning inspection system and related methods are proposed in this paper. The system is suitable for inspecting blanks of anonymous space surface that has no salient features. Due to limitations of 3D scanning technology, typically multiple datasets must be captured from different viewpoints by laser scanning, each is associated with a different coordinate system, then all the 3D point data must be registered into a common coordinate system. After registration, partly critical dimensions, or all dimensions can be inspected, even the reason for the dimension deviation can also be analyzed by aligning the complete point cloud with the CAD model. Different kinds of similar blanks can be inspected through utilizing flexible vacuum fixture. Compared to the currently existing manual inspection methods whose outputs are qualitative, the proposed inspection system is not only automatic and flexible, but outputs quantitative results. Furthermore, it avoids man-made errors and cuts costs by saving particular facilities, especially expensive inspection fixtures.