Wagemann E U, Schönleber M, Tiziani H J
Opt Lett. 1998 Oct 15;23(20):1621-3. doi: 10.1364/ol.23.001621.
A new method of fringe projection for shape measurement is presented. We use a combination of object-adapted fringes and holographic grazing projection to determine shape deviations of a turbine blade. If the shape of a test object is correct, a fringe grid with constant period is detected by the camera. The object-adapted fringes are projected coherently onto the master object, and a hologram is taken. If the hologram is reconstructed, grazing incidence of object-adapted fringes can be realized. Grazing holographic projection allows for higher triangulation angles and therefore increased sensitivity. Even small shape deviations can be detected and quantitatively evaluated with fast algorithms. The method can be extended to multiple exposed holograms to examine deep objects.
提出了一种用于形状测量的条纹投影新方法。我们使用自适应条纹和全息掠射投影相结合的方式来确定涡轮叶片的形状偏差。如果测试物体的形状正确，相机将检测到具有恒定周期的条纹网格。将自适应条纹相干地投影到主物体上，并拍摄全息图。如果重建全息图，就可以实现自适应条纹的掠射入射。掠射全息投影允许更高的三角测量角度，从而提高灵敏度。即使是很小的形状偏差也可以通过快速算法检测并进行定量评估。该方法可以扩展到多个曝光全息图，以检测深物体。
