densitometer

[den-si-tom-i-ter]
noun
1.
Photography. an instrument for measuring the density of negatives.
2.
a densimeter.

Origin:
1900–05; densit(y) + -o- + -meter

densitometric [den-si-tuh-me-trik] , adjective
densitometry, noun
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World English Dictionary
densitometer (ˌdɛnsɪˈtɒmɪtə)
 
n
an instrument for measuring the optical density of a material by directing a beam of light onto the specimen and measuring its transmission or reflection
 
densitometric
 
adj
 
densi'tometry
 
n

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American Heritage
Medical Dictionary

densitometer den·si·tom·e·ter (děn'sĭ-tŏm'ĭ-tər)
n.

  1. An apparatus for measuring the optical density of a material, such as a photographic negative.

  2. See densimeter.


den'si·tom'e·try (-ĭ-trē)
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

densitometer

device that measures the density, or the degree of darkening, of a photographic film or plate by recording photometrically its transparency (fraction of incident light transmitted). In visual methods, two beams of equal intensity are used. One is directed through the plate, while the intensity of the other is adjusted by an optical wedge, by an iris diaphragm, or by moving the source, until the two beams have equal intensity, judged by the eye or by a photoelectric cell. With proper calibration, the density can be read directly. Other methods employ photoelectric cells to measure the intensity of the same beam with and without film or plate inserted in the path, the difference in intensity being a measure of density.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The same reference standards are measured by densitometer.
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