Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008pnaoc...5..307z&link_type=abstract
Astronomical Research and Technology. Publications of National Astronomical Observatories of China (ISSN 1672-7673), Vol. 5, No.
Astronomy and Astrophysics
Astronomy
Off-Axis, Aspheric, Paraxial Radius, Conic Constant, Lateral Displacement, Tilt Angles, Conjugate Direction Method
Scientific paper
To ensure the accuracy of conic surface in the fabrication of off-axis aspheric section, it is important to control the current surface parameters, such as the lateral displacement, tilt angle, the paraxial radius and the conic constant. From the normal equation for conic aspheric, new equation of conic aspheric was derived in new correlation system. Based on the new equation, the lateral displacement, tilt angle and the paraxial radius can be calculated with Conjugate Direction Method to minimize the RMS of deviation. The experimental result of the paraboloid and hyperboloid with different shapes are presented, the fitting accuracy arrived at 10nm rms. Thus, the deviation of the off-axis aspheric section can be controlled effectively.
Li Xin-Nan
Zhou Yanhua
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