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Proceedings Paper

A Pulsed Photoelectric Scanning System For Angular Measurement In Astrometry
Author(s): P. Jones; E. Coyne; J. Davis; C. Watts
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Paper 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.

Paper Details

Date Published: 1 June 1973
PDF: 8 pages
Proc. SPIE 0038, Electro-Optics Principles and Applications, (1 June 1973); doi: 10.1117/12.953757
Show Author Affiliations
P. Jones, U. S. Naval Observatory (United States)
E. Coyne, U. S. Naval Observatory (United States)
J. Davis, U. S . Naval Observatory (United States)
C. Watts, Watts Prototype (United States)

Published in SPIE Proceedings Vol. 0038:
Electro-Optics Principles and Applications
John B. DeVelis; Brian J. Thompson, Editor(s)

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