1 June 1973 A Pulsed Photoelectric Scanning System For Angular Measurement In Astrometry
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Abstract
A photoelectric scanning system has been constructed to determine line positions on the 65-centimeter diameter divided circle of a meridian circle telescope. The system consists of six scanning micrometers attached to microscopes which are aimed at different portions of the circle. Each micrometer has a field of view of 0.35 degrees. Six different quasi-linear segments on the circumference of the divided circle are scanned simultaneously. Profiles of divided circle lines and reference lines are obtained in digital form and analyzed by a data acquisition computer. On repeated scans (n=30) the system achieved a resolu-tion of 0.04 arcsec with a standard devia tion of 0.05 arcsec. The operational characteristics and reliability of the system indicate that it can be used as a real -time primary angular readout method for the accurate determination of the zenith distances of stars.
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P. Jones, P. Jones, E. Coyne, E. Coyne, J. Davis, J. Davis, C. Watts, C. Watts, "A Pulsed Photoelectric Scanning System For Angular Measurement In Astrometry", Proc. SPIE 0038, Electro-Optics Principles and Applications, (1 June 1973); doi: 10.1117/12.953757; https://doi.org/10.1117/12.953757
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