Bending the CFHT Cassegrain secondary for optical figure improvement

Details Bending the CFHT Cassegrain secondary for optical figure improvement Bending the CFHT Cassegrain secondary for optical figure improvement

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..444..253b&link_type=abstract

IN: Advanced technology optical telescopes II; Proceedings of the Meeting, London, England, September 5, 6, 1983 (A85-25230 10-8

Physics

Optics

Bending, Cassegrain Optics, Mirrors, Optical Correction Procedure, Reflecting Telescopes, Aberration, Loading Rate, Performance Tests

Scientific paper

The bending of the Cassegrain secondary of the CFHT telescope is discussed. Bending forces are generated by pneumatic pressure and a vacuum. In order to float the mirror in its cell and avoid support reaction, their resultant is kept equal to zero. Tests of the deformed mirror in which one-dimensional Hartmann plates, knife-edge photographs, and Foucaultgrams are used, indicate the disappearance of all spherical aberration. The one-dimensional data indicates peak to peak mirror surface errors of less than lambda/8 and a weighted residual mirror surface error of about 0.04 lambda, both of which are close to the predicted values.

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