High Resolution Position And Velocity Measurement With Incremental Encoders

U. Beckmann; R. Bardenheuer

doi:10.1117/12.937968

3 November 1983 High Resolution Position And Velocity Measurement With Incremental Encoders

U. Beckmann, R. Bardenheuer

Proceedings Volume 0444, Advanced Technology Optical Telescopes II; (1983) https://doi.org/10.1117/12.937968
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

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. This accuracy can only be achieved when the antenna position (angle) and velocity as well as the motor position and velocity are measured. 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. The installation of the measurement electronics at the 30 meter MRT is finished, and tests have been started. These show that the required accuracy can be achieved.

Citation Download Citation

U. Beckmann and R. Bardenheuer "High Resolution Position And Velocity Measurement With Incremental Encoders", Proc. SPIE 0444, Advanced Technology Optical Telescopes II, (3 November 1983); https://doi.org/10.1117/12.937968

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