High resolution position and velocity measurement with incremental encoders.

Details High resolution position and velocity measurement with incremental encoders. High resolution position and velocity measurement with incremental encoders.

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984spie..444q.127b&link_type=abstract

Proc. SPIE Int. Soc. Opt. Eng., Vol. 444, p. 127 - 131

Astronomy and Astrophysics

Astronomy

Scientific paper

The use of optical telescopes for infrared and radioastronomy, where observations can also be made in daytime, requires reproducible positioning. Exceptionally good tracking is demanded particularly for radioastronomy, when the observation range extends to the millimeter- and submillimeter wavelengths. For radio telescopes with a small antenna beamwidth (below 1 arcmin) position errors should not exceed a few arcsec. The measurement of magnitudes in the arcsec region can be done with commercially available incremental encoders. For these encoders electronic circuits have been developed to guarantee the required resolution. The design of the electronic circuits also provide possibilities to correct encoder errors and interface to the host computer.

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