Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asmd.conf..163a&link_type=abstract
In NASA. Goddard Space Flight Center Astron. Microdensitometry Conf. p 163-173 (SEE N84-28020 18-35)
Astronomy and Astrophysics
Astronomy
Amplifiers, Astronomy, Circuits, Logarithmic Receivers, Microdensitometers, Optical Density, Circuit Boards, Imaging Techniques, Modulation Transfer Function, Photometers, Stellar Spectra
Scientific paper
A 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.
Anderson Martha C.
Michalski Donald E.
Slovak Mark H.
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