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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 ?
- To analyze and forecast the market size of global atomic absorption spectrophotometer market.
The subject positioned his/her bare right forearm next to the sample port of the integrating sphere of the spectrophotometer (see Fig.
The combined Ceram-CyberChrome test provides documentation which can be used to validate the performance of spectrophotometers for colour compliance programmes and/or international standards conformance.
One of the advantages is that no lid is needed for the spectrophotometer to take an accurate reading.
As a metric for the evaluation of the measurement precision of a spectrophotometer a pooled standard deviation is used.
This acquisition gives Harvard a low cost diode array spectrophotometer to fit with its other scientific instrument products.
The new Minolta CM-2600d portable spectrophotometer for color measurement is another in Minolta's expanding lines of Enhanced Performance Technology instruments.
Intended for fabric and garment manufacturers, large clothing retailers and testing agencies, Solascreen consists of a Cary 50 UV-Vis spectrophotometer with an accessory that enables fast, easy measurement of a fabric or garment for UV filtration effectiveness.
To perform their experiment, Zapol's group had to ensure that they could find the seals to retrieve the spectrophotometer measurements between dives.
Biochrom' has added two products to its WPA Visible Spectrophotometer Range--the WPA S800+ and S1200+ spectrophotometers.
The Datacolor 800 family is the next generation of the "market's only true close-tolerance spectrophotometer that ensures color can be communicated digitally," the company says.