基于条纹投影的复杂曲面测量技术

如何快速、高精度地测量复杂曲面的三维轮廓是目前的一个热点研究方向。与现有的测量方法相比,条纹投影轮廓测量技术具有非接触测量、测量速度快和重构点云密集等优点,在逆向工程等领域得到了广泛的应用。本文搭建了基于条纹投影轮廓测量技术的复杂曲面测量装置,并且对相位误差标定及补偿、投影仪精确标定、高阶系统模型简化以及有效点云快速识别等条纹投影轮廓测量的关键技术进行了深入地研究。最后使用该装置进行了叶片表面轮廓测量实验,实验结果表明,本文设计装置的测量偏差最大值不超过0.05 mm。

Measurement Technique of Complex Curved-profile Based on Fringe Projection Profilometry

It is a hot research direction at present to measure the three-dimensional (3D) profile of complex curved-surface rapidly and accurately. Compared with the existing measurement methods, the fringe projection profilometry (FPP) has extensive applications for its advantages, such as non-contact measurement, fast speed and dense reconstruction point cloud. It has been widely applied in reverse engineering. In this paper, a FPP system was built to measuring the complex curved-profiles. To improve the measurement accuracy, key technologies of fringe projection contour measurement such as phase error calibration and compensation, precise projector calibration, simplification of high-order calibration model and quick identification of valid points are thoroughly studied. Finally, the profile of an aero-engine blade is measured using the system. Experimental result shows that the maximum measurement deviation is not greater than 0.05mm.