The Ronchi grating is applied to measure the large-aperture aspheric surfaces in a quantitative way on the basis of self-made software which includes Ronchi null grating design, collection of Ronchi graph. and data processing. The measured concave parabolic mirror has a diameter of 630 mm and all F number of 1.34. The measurement result is approximately the same as that of the ZYGO interferometer. This analysis software and test method establish a good foundation for the quantitative measurement of the big error about the large-aperture aspheric surfaces of the next generation telescope.
1.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Yantai Univ, Inst Sci & Technol Optoelect Informat, Yantai 264005, Peoples R China
Lei, Baiping,Wu, Fan,Zhou, Chenbo. Quantitative measurement of Phi 630 mm F/1.34 parabolic surfaces with Ronchi grating test method[J]. CHINESE OPTICS LETTERS,2009,7(7):590-592.