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Densitometer - Wikipedia, the free encyclopedia
A densitometer is a device that measures the degree of darkness (the optical density) of a photographic or semitransparent material or of a reflecting surface.
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Densitometer

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Densitometer, device for determining the degree of darkening of photographic film or other semitransparent objects, or for measuring the thickness of a film deposited on a surface. Most densitometers make use of a photoelectric cell. In the simplest, a light source is aimed at a photosensitive cell, readings are taken with and without the sample in place, and the density of the sample is derived from the difference in the readings.

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