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. In the Physical sciences Quality assurance, and Engineering, Measurement is the activity of obtaining and comparing physical quantities In Optics, density is a unitless measure of the Transmittance of an optical element for a given length at a given Wavelength λ: 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. A solar cell or photovoltaic cell is a device that converts Solar energy into Electricity by the photovoltaic effect. A solar cell or photovoltaic cell is a device that converts Solar energy into Electricity by the photovoltaic effect. Modern densitometers have the same components, but also have electronic integrated circuitry for better reading. Electronics refers to the flow of charge (moving Electrons through Nonmetal conductors (mainly Semiconductors, whereas electrical An electronic circuit is a closed path formed by the interconnection of Electronic components through which an Electric current can flow There are two types:
- Transmission densitometers that measure transparent materials
- Reflection densitometers that measure light reflected from a surface. Light, or visible light, is Electromagnetic radiation of a Wavelength that is visible to the Human eye (about 400–700
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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Dictionary
densitometer
-noun
- A device that measures the optical density of a material.
- A device that measures the specific gravity of a substance; a densimeter.
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