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Energy-Recording Microdensitometer

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Abstract

An inverse densitometric circuit is described which employs the technique of voltage-transfer curve translation to provide a direct linear measure to photographic-energy profiles. An antilog D scale (reciprocal-transmittance scale) linear to ±0.05 antilog D units over a basic antilog D range of 12 is obtained. Neutral-density filters are used to compound the basic sensitivity increment and obtain a total light-level range in excess of 1 to 103. An optical system is described which provides an instrument resolving power of 500 lines/mm.

© 1961 Optical Society of America

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