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An improved logarithmic amplifier circuit for PDS microdensitometersA high speed logarithmic amplifier circuit for the Perkin-Elmer PDS microdensitometer is discussed. The circuit is designed around an Analog Devices 757p log-amp module. The amplifier produces undistorted profiles of rapidly changing, dense ( 4) images over the available range of scanning speeds. The circuit board was designed to replace directly the manufacturer supplied unit; neither electrical nor mechanical modifications of the basic PDS are required. The performance of the circuit is illustrated through its effects on the overall modulation transfer function of the instrument and by scans of a well exposed stellar image. Circuit diagrams and parts lists a mechanism for obtaining either circuit board layout art work or finished circuit boards are presented.
Document ID
19840019965
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Anderson, C. M. (Wisconsin Univ. Madison, WI, United States)
Slovak, M. H. (Wisconsin Univ. Madison, WI, United States)
Michalski, D. E. (Wisconsin Univ. Madison, WI, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1984
Publication Information
Publication: NASA. Goddard Space Flight Center Astron. Microdensitometry Conf.
Subject Category
Electronics And Electrical Engineering
Accession Number
84N28034
Funding Number(s)
CONTRACT_GRANT: NAS5-2677
CONTRACT_GRANT: NSF AST-79-00894
CONTRACT_GRANT: NSF AST-81-21099
CONTRACT_GRANT: NSF AST-80-11445
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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IDRelationTitle19840019951Collected WorksAstronomical Microdensitometry Conference
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