Densitometer


Densitometer
Not to be confused with hydrometer which measures mass density of liquids.
Heiland Densitometer TRDZ 1

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. The densitometer is basically a light source aimed at a photoelectric cell. It determines the density of a sample placed between the light source and the photoelectric cell from differences in the readings. Modern densitometers have the same components, but also have electronic integrated circuitry for better reading. There are two types:

  • Transmission densitometers that measure transparent materials
  • Reflection densitometers that measure light reflected from a surface.

Some modern types of German manufacture are capable of both types of measurements selectable by a switch. They are used in film photography to measure densities of negatives with the switch in the "T" (Transmission) position and the saturation of a resulting print in the "R" position. Such measurements enable the photographer to choose the right photo paper and the correct exposure, obviating experiments with test strips. Once the papers and darkroom have been calibrated, the first print from a previously measured negative is a success at once.

Densitometers are used for measuring color saturation by print professionals, and calibrating printing equipment. They are also used for making adjustments so outputs are consistent with the colors desired in the finished products.

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Look at other dictionaries:

  • densitometer — n. 1. an instrument for determining optical or photographic density. A variety capable of measuring optical density of a sample at a number of different wavelengths, is called a {spectrophotometer}. [WordNet 1.5] 2. same as {densimeter}. [PJC] …   The Collaborative International Dictionary of English

  • densitometer — [den΄sə täm′ət ər] n. [< DENSITY + METER] 1. a device for measuring optical density, as of a photographic negative 2. DENSIMETER …   English World dictionary

  • Densitometer — Durchsicht Densitometer Aufsicht Densitometer …   Deutsch Wikipedia

  • Densitometer — densitometras statusas T sritis Standartizacija ir metrologija apibrėžtis Išryškinto fotografinio sluoksnio arba ant tam tikro pagrindo sudaryto vaizdo dažų sluoksnio optinio tankio matuoklis. atitikmenys: angl. densitometer; opacimeter vok.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • densitometer — densitometras statusas T sritis Standartizacija ir metrologija apibrėžtis Išryškinto fotografinio sluoksnio arba ant tam tikro pagrindo sudaryto vaizdo dažų sluoksnio optinio tankio matuoklis. atitikmenys: angl. densitometer; opacimeter vok.… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • Densitometer — densitometras statusas T sritis fizika atitikmenys: angl. densitometer; opacimeter vok. Densitometer, n; Densometer, n; Schwärzungsmesser, m rus. денситометр, m pranc. densitomètre, m …   Fizikos terminų žodynas

  • densitometer — densitometras statusas T sritis fizika atitikmenys: angl. densitometer; opacimeter vok. Densitometer, n; Densometer, n; Schwärzungsmesser, m rus. денситометр, m pranc. densitomètre, m …   Fizikos terminų žodynas

  • densitometer — noun Date: 1901 an instrument for determining optical, photographic, or mass density < diagnose osteoporosis using an X ray bone densitometer > • densitometric adjective • densitometry noun …   New Collegiate Dictionary

  • densitometer — 1. An instrument for measuring the density of a fluid. SYN: densimeter. 2. An instrument for measuring, by virtue of relative turbidity, the growth of bacteria in broth; useful in microbiologic assay of nutrients and antibiotics, phage …   Medical dictionary

  • Densitometer — Den|si|to|me|ter 〈n. 13〉 Instrument zum Messen der Schwärze (Dichte) fotografischer Schichten * * * Den|si|to|me|ter [lat. densitas = Dichte; ↑ meter], das; s, ; Syn.: Densometer: photoelektr. arbeitendes Gerät zur Messung der ↑ …   Universal-Lexikon


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