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Abstract:

A scanning device was developed for the purpose of recording a frequency power spectrum in a sample area of a photographic film in the form of a direct read-out. A rotary scanner, using an optical spot sufficiently small to obtain good modulation from a 250 linemm target, was selected. The signal from the scanner was read out on a frequency analyzer which recorded the power spectrum as a chart trace. The wave form of the scanned film could also be studied in real-time as an oscilloscope trace for immediate analysis. Recorded frequency response at 500 linesmm was 6 db above background from a random target. Author

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