https://www.selleckchem.com/pr....oducts/isa-2011b.htm
The measurement of aspheric surfaces is very difficult and challenging. An optical system with a single coated lens is proposed for measuring large-aperture aspheric convex/concave surfaces. In this system, the first surface of the compensator is used as an auto-collimation surface, which can realize high-precision null compensation. Based on the third-order aberration theory, the initial design parameters of the system are obtained by analytical calculation, and the parameters are then optimized numerically. An oblate spheroid with a
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