Position control of the mirror figure control actuator for the Keck Observatory ten meter primary mirror.

Details Position control of the mirror figure control actuator for the Keck Observatory ten meter primary mirror. Position control of the mirror figure control actuator for the Keck Observatory ten meter primary mirror.

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1114..266m&link_type=abstract

Conference on Active Telescope Systems, p. 266 - 274

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1

Telescopes: Alignment

Scientific paper

Each of the 108 hydraulic actuators on the Keck ten meter primary mirror lengthens or shortens under electronic control in steps of about four nanometers. The authors discuss observed stictional and other mechanical phenomena associated with very short bi-directional actuator length changes and trace the impact of the various constraints on actuator controller design and implementation. They present some results of tests with an actuator controller driving an actuator which in turn drives a displacement sensor.

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