A shaped aperture for two-dimensional microdensitometry

Details A shaped aperture for two-dimensional microdensitometry A shaped aperture for two-dimensional microdensitometry

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..123l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Jan. 1986, p. 123-127.

Astronomy and Astrophysics

Astronomy

1

Apertures, Astrometry, Astronomical Photography, Microdensitometers, Photometry, Approximation, Image Processing, Isophotes, Systems Engineering, Telescopes, Tradeoffs

Scientific paper

A study of microdensitometer configurations and the tradeoffs among them was conducted in connection with the development of the Guide Star Selection System (GSSS) for the Space Telescope (ST). GSSS operations are to be based on a new catalog, called the ST Guide Star Catalog (ST GSC). Microdensitometer scans of approximately 1500 plates obtained from the Palomar and the UK Schmidt telescopes are to provide the basic data for constructing the ST GSC. Attention is given to project-specific sampling requirements, the shaped-aperture configuration, an ad hoc implementation, and the isophotal approximation. Based on the project's need for an in-focus PDS scanning configuration with approximately isotropic response and small aliasing, the concept of the shaped aperture was developed.

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