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A Pulsed Photoelectric Scanning System For Angular Measurement In Astrometry

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.