Microdensitometer errors: Their effect on photometric data reduction

Details Microdensitometer errors: Their effect on photometric data reduction Microdensitometer errors: Their effect on photometric data reduction

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984asmd.conf...45b&link_type=abstract

In NASA. Goddard Space Flight Center Astron. Microdensitometry Conf. p 45-58 (SEE N84-28020 18-35)

Computer Science

Performance

Astronomical Photometry, Data Reduction, Error Analysis, Microdensitometers, Optical Measurement, Performance Tests, Algorithms, Density Measurement, Digital Data, Imaging Techniques, Optical Scanners, Photographic Plates

Scientific paper

The performance of densitometers used for photometric data reduction of high dynamic range electrographic plate material is analyzed. Densitometer repeatability is tested by comparing two scans of one plate. Internal densitometer errors are examined by constructing histograms of digitized densities and finding inoperative bits and differential nonlinearity in the analog to digital converter. Such problems appear common to the four densitometers used in this investigation and introduce systematic algorithm dependent errors in the results. Strategies to improve densitometer performance are suggested.

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