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instrument for measuring and comparing the intensities of common spectral lines in the spectra of two different sources of light. See photometryphotometry
, branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light such a source may cast on a surface area.
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; spectroscopespectroscope,
optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it emits light that is characteristic of the atomic makeup of the material.
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; spectrumspectrum,
arrangement or display of light or other form of radiation separated according to wavelength, frequency, energy, or some other property. Beams of charged particles can be separated into a spectrum according to mass in a mass spectrometer (see mass spectrograph).
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(spek-troh-foh-tom -ĕ-ter) An instrument designed to measure the intensity of a particular spectral line or a series of spectral lines in an absorption or emission spectrum.



a spectroscopic instrument by means of which photometric measurements are carried out. In spectrophotometers, the light flux being measured is compared with a standard, or reference, flux for a continuous or discrete series of radiation wavelengths. The results of the comparison may be read manually or be recorded automatically on a chart where the abscissa is the wavelength and the ordinate is the result of the photometric measurement at this wavelength.

Also classed as spectrophotometers are analytical instruments that, instead of measuring spectra, determine the concentration of elements in a sample on the basis of the absorption or emission lines of atoms in a flame (absorption or flame spectrophotometers) or determine the concentration of components in mixtures of substances on the basis of characteristic absorption bands (double-beam infrared spectrophotometers or analyzing spectrophotometers).

The principal types of spectrophotometers are described in SPECTROSCOPIC INSTRUMENTS.


An instrument that consists of a radiant-energy source, monochromator, sample holder, and detector, used for measurement of radiant flux as a function of wavelength and for measurement of absorption spectra.


An instrument for measuring the reflectance and transmittance of surfaces and media as a function of wavelength.
References in periodicals archive ?
While not as accurate as high-end on-line spectrophotometers (such as HunterLab's Spectra-Probe unit) that sell for over $50,000, this is said to be a cost-effective option for color-difference QC monitoring.
Hunterlab featured its Spectra-Probe on-line spectrophotometer, which allows for continuous color monitoring during production of extruded pellets and films, as well as opaque and translucent sheets.
will introduce a miniature spectrophotometer for color measurement on-line or of remote, hard-to-reach parts or surfaces.
Today's portable colorimeters cost in the range of $4000-6000, down from $6000-8000 five years ago, handheld spectrophotometers can now be had for as little as $6500-7000, although higher-end instruments run $10,000-12,000.
Through our commitment to provide customers with the highest quality colour measurement instruments, we developed the Datacolor 850 and 550 spectrophotometers to give customers enhanced ease-of-use and unrivaled performance," said Diane Geisler, Global Director of Product Management, Datacolor.
The Datacolor 800 family is the next generation of the market's only true close-tolerance spectrophotometer that ensures color can be communicated digitally.
In 2014, the spectrophotometers segment accounted for the largest share of the market.
The Cary 7000 UMS is an advanced spectrophotometer for measuring the reflection and transmission properties of a material as a function of wavelength.
com)-- Ceram's Colour Standards and CyberChrome's OnColor Instrument Performance software enables the verification, monitoring, optimisation and certification of spectrophotometers, and hence assurance of accurate colour matches.
Detailing Jenway's extensive range of analytical instrumentation the new catalogue is a 'go to' resource for detail and expert advice on colorimeters, conductivity meters, dissolved oxygen meters, flame photometers, fluorimeters, ion meters, pH meters and spectrophotometers.
KMSA) has launched its newest bench-top spectrophotometers, the CM-3600A and CM-3610A.