Large mirror figuring and testing

Details Large mirror figuring and testing Large mirror figuring and testing

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.160..207b&link_type=abstract

(Group of Optical and Infrared Astronomers in Japan, Astronomical Society of Japan, Inamori Foundation, et al., International Sy

Astronomy and Astrophysics

Astrophysics

1

Asphericity, Mirrors, Surface Geometry, Telescopes, Dynamic Pressure, Infrared Interferometers, Lens Design, Manufacturing

Scientific paper

A method for figuring and testing large aspheric mirrors using a rectangular, flexible lap (the so-called 'membrane tool') and a vibration stabilized interferometer is described. The rear side of the lap is covered with computer controlled dynamic pressure actuators which determine the amount of material to be removed for surface error correction. This method has been developed in the laboratory and tested to some extent by figuring the f/2.2 primary of the 3.6-m ESO-NTT. The ongoing developments and the manufacturing plan for 8-m-class mirrors are described.

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