Segment alignment for the Keck Telescope primary mirror

Details Segment alignment for the Keck Telescope primary mirror Segment alignment for the Keck Telescope primary mirror

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..628..466c&link_type=abstract

IN: Advanced technology optical telescopes III; Proceedings of the Meeting, Tucson, AZ, Mar. 3-6, 1986 (A87-35201 15-89). Bellin

Physics

Optics

Alignment, Cameras, Cassegrain Optics, Mirrors, Reflecting Telescopes, Charge Coupled Devices, Crosstalk, Diffraction Patterns, Stellar Luminosity

Scientific paper

A Shack-Hartmann camera is presently used to align and phase the thirty-six segments of the ten-meter primary mirror of the Keck Telescope. Tilt errors are determined by employing the Shack-Hartmann device in a manner exactly analogous to that used in mirror testing and in adaptive optics. Piston errors are determined (with the same device) by exploiting diffraction effects near the inter-segment edges. These two tests are shown to have sensitivities that are comparable to each other and that are sufficient to achieve the design goals of the telescope. The tilt test can be extended to give information both about the individual segment figures and about the global mirror parameters. Some of the complications and potential systematic effects associated with these tests are discussed.

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