Campos-García Manuel, Moreno-Oliva Víctor Iván, Díaz-Uribe Rufino, Granados-Agustín Fermín, Santiago-Alvarado Agustín
Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Apartado Postal 70-186, Mexico 04510, D.F. Mexico.
Appl Opt. 2011 Jul 1;50(19):3101-9. doi: 10.1364/AO.50.003101.
A method for testing fast aspheric convex surfaces with dynamic null screens using LCDs is shown. A flat null screen is designed and displayed on an LCD monitor with drop-shaped spots in such a way that the image, which is formed by reflection on the test surface, becomes an exactly square array of circular spots if the surface is perfect. Any departure from this geometry is indicative of defects on the surface. Here the whole surface is tested at once. The position of the spots on the LCD can be changed in a dynamic way, to perform point-shifting of the image spots. The proposed procedure improves the dynamic point-shifting method. As has been shown previously, this process reduces the numerical error during the integration procedure, thereby improving the sensitivity of the test. The positioning accuracy for the screen spots is related to the LCD's spatial resolution. Results of the evaluation of a parabolic convex surface with f/#=0.22 are shown.
展示了一种使用液晶显示器（LCD）通过动态零位屏幕测试快速非球面凸面的方法。设计了一个平面零位屏幕，并在LCD显示器上显示出液滴状斑点，使得由测试表面反射形成的图像在表面完美时成为圆形斑点的精确方形阵列。与这种几何形状的任何偏差都表明表面存在缺陷。这里整个表面是一次性测试的。LCD上斑点的位置可以动态改变，以执行图像斑点的点移动。所提出的程序改进了动态点移动方法。如前所示，这个过程减少了积分过程中的数值误差，从而提高了测试的灵敏度。屏幕斑点的定位精度与LCD的空间分辨率有关。展示了对f/#=0.22的抛物面凸面的评估结果。
