Densitometer
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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 A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon.
. It determines the density of a sample placed between the light source and the
photoelectric cell A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical and chemical phenomenon.
from differences in the readings. Modern densitometers have the same components, but also have
electronic Electronic may refer to: *Electronics, the science of how to control electric energy in semiconductor * ''Electronics'' (magazine), a defunct American trade journal *Electronic storage, the storage of data using an electronic device *Electronic co ...
integrated
circuitry An electronic circuit is composed of individual electronic components, such as resistors, transistors, capacitors, inductors and diodes, connected by conductive wires or traces through which electric current can flow. It is a type of electrical ...
for better reading.


Types

*Transmission densitometers that measure transparent materials *A transmission densitometer used to measure transparent surfaces measure color transparencies. Film & transparent substrates are some examples of common transparent surface measures. *Reflection densitometers that measure
light Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 te ...
reflected from a surface of any state.


Photography applications

Some 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.


Uses

*Densitometers are used for measuring color saturation by print professionals *Calibration of printing equipment *It serves as one of the
Molecular tools for gene study Nucleic acid methods are the techniques used to study nucleic acids: DNA and RNA. Purification *DNA extraction *Phenol–chloroform extraction *Minicolumn purification *RNA extraction * Boom method * Synchronous coefficient of drag alteration ( ...
, to quantify the radioactivity of a compound such as radiolabeled DNA. *They are also used for making adjustments so that outputs are consistent with the colors desired in the finished products. *They are used in industrial radiography to ensure x-ray films are within code-required density ranges. They are also used to compare relative material thicknesses. *Densitometers are used for process control of density dot gain, dot area & ink trapping. *Densitometer readings will be different for different types of printing process & substrates. *to find density of water * to find knowledge


See also

*
Density Meter A density meter, also known as a densimeter, is a device that measures the density. Density is usually abbreviated as either \rho or D . Typically, density either has the units of '' kg/m^3 '' or '' lb/ft^3 ''. The most basic principle of how d ...
*
Densitometry Densitometry is the quantitative measurement of optical density in light-sensitive materials, such as photographic paper or photographic film, due to exposure to light. Overview Optical density is a result of the darkness of a developed picture ...
*
Density meter A density meter, also known as a densimeter, is a device that measures the density. Density is usually abbreviated as either \rho or D . Typically, density either has the units of '' kg/m^3 '' or '' lb/ft^3 ''. The most basic principle of how d ...
*
Microdensitometer A microdensitometer is an optical instrument used to measure optical densities in the microscopic domain. J. C. Dainty and R. Shaw, ''Image Science'' (Academic, New york, 1974).T. H. James, ''The Theory of the Photographic Process'' (Eastman Kodak ...
* Spectrophotometer *
Molecular tools for gene study Nucleic acid methods are the techniques used to study nucleic acids: DNA and RNA. Purification *DNA extraction *Phenol–chloroform extraction *Minicolumn purification *RNA extraction * Boom method * Synchronous coefficient of drag alteration ( ...


References

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External links


In depth article explaining densitometers
Measuring instruments