1 June 1973 A Pulsed Photoelectric Scanning System For Angular Measurement In Astrometry
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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.
© (1973) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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