Methods for measuring and reducing slippage of friction rollers employed in off-axis couplings of position encoders to telescopes

Robert I. Kibrick; Steven L. Allen

doi:10.1117/12.19251

1 July 1990 Methods for measuring and reducing slippage of friction rollers employed in off-axis couplings of position encoders to telescopes

Robert I. Kibrick, Steven L. Allen

Author Affiliations +

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19251
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

Instrumentation and procedures developed for the study of friction-roller slippage in off-axis couplings of telescope position encoders are presented, and the designs of rollers and their mountings are examined with a view to the characterization of adjustment techniques yielding optimal alignment of the rollers to minimize slippage. Attention is given to the use of various types of fiducials, including GEO satellites and inexpensive optoelectronic sensors, to gather measures of both telescope-position encoder repeatability and telescope hysteresis which are independent of the telescope-pointing model.

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Robert I. Kibrick and Steven L. Allen "Methods for measuring and reducing slippage of friction rollers employed in off-axis couplings of position encoders to telescopes", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19251

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