Noncontact methods for optical testing of convex aspheric mirrors for future large telescopes

Details Noncontact methods for optical testing of convex aspheric mirrors for future large telescopes Noncontact methods for optical testing of convex aspheric mirrors for future large telescopes

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7389e..43g&link_type=abstract

Optical Measurement Systems for Industrial Inspection VI. Edited by Lehmann, Peter H.. Proceedings of the SPIE, Volume 7389 (20

Computer Science

Scientific paper

Non-contact methods for testing of large rotationally symmetric convex aspheric mirrors are proposed. These methods are based on non-null testing with side illumination schemes, in which a narrow collimated beam is reflected from the meridional aspheric profile of a mirror. The figure error of the mirror is deduced from the intensity pattern from the reflected beam obtained on a screen, which is positioned in the tangential plane (containing the optical axis) and perpendicular to the incoming beam. Testing of the entire surface is carried out by rotating the mirror about its optical axis and registering the characteristics of the intensity pattern on the screen. The intensity pattern can be formed using three different techniques: modified Hartman test, interference and boundary curve test. All these techniques are well known but have not been used in the proposed side illumination scheme. Analytical expressions characterizing the shape and location of the intensity pattern on the screen or a CCD have been developed for all types of conic surfaces. The main advantage of these testing methods compared with existing methods (Hindle sphere, null lens, computer generated hologram) is that the reference system does not require large optical components.

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