Alignment and calibration of the W.M. Keck Telescope segmented primary mirror

Details Alignment and calibration of the W.M. Keck Telescope segmented primary mirror Alignment and calibration of the W.M. Keck Telescope segmented primary mirror

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236.1052w&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89

Astronomy and Astrophysics

Astronomy

Active Control, Actuators, Alignment, Computer Techniques, Mirrors, Telescopes, Control Systems Design, Image Analysis, Vax Computers

Scientific paper

The camera, algorithms, and software used to coalign (star stack) the 36 segments of the Keck Telescope primary are described. The camera and software also calibrate the sensors and actuators used for primary-mirror control and optimize the secondary-mirror position. Data resulting from these activities are used by the primary-mirror active control system to stabilize the primary segments and by the telescope drive and control system to adjust the secondary. The camera must collect data at various telescope temperatures and zenith angles. The data acquisition and analysis are automated to improve the accuracy and repeatability of the results and to reduce the demands on the operator. Under the operator's guidance, a DEC VAXstation II computer analyzes star images, issues commands to move the optical elements and telescope structure, acquires settings from the telescope and primary control systems and stores the measurement results in a database.

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