Abstract: An optical test has been devised to test and qualify null correctors that are used for measuring highly aspheric primary mirrors. The technique employs a rotationally symmetric computer- generated hologram (CGH) that tests the null corrector directly by synthesizing a wavefront that would be returned by a perfect primary mirror. A description of the test and summary of the error analysis are given. The error analysis includes hologram errors from pattern distortion, substrate flatness, and etch depth variations. It also includes the effects of errors in the wavelength and data analysis errors. This resulting analysis shows $POM 78 ppm accuracy for measuring the conic constant of null correctors built for measuring 3.5 -m f/1.75 primary mirrors. !26
展开▼
机译：摘要：已经设计出一种光学测试来测试和验证用于测量高度非球面主镜的零校正器。该技术采用旋转对称计算机生成的全息图（CGH），该全息图通过合成将由理想主镜返回的波前直接测试零校正器。给出了测试说明和错误分析摘要。误差分析包括来自图案变形，衬底平坦度和蚀刻深度变化的全息图误差。它还包括波长误差和数据分析误差的影响。该结果分析显示，对于测量用于测量3.5 -m f / 1.75主镜的零点校正器的圆锥常数，POM精度为78 ppm。 ！26
展开▼
