spectrophotometer

enUK

spectrophotometer,

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.
..... Click the link for more information. ; 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.
..... Click the link for more information. ; 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).
..... Click the link for more information. .

spectrophotometer

(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.

Spectrophotometer

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.

spectrophotometer

[¦spek·trō·fə′täm·əd·ər] (spectroscopy) 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.

spectrophotometer

An instrument for measuring the reflectance and transmittance of surfaces and media as a function of wavelength.

spectrophotometer

enUK

spectrophotometer

[spek″tro-fo-tom´ĕ-ter] 1. an apparatus for measuring light sense by means of a spectrum.2. an apparatus for determining the quantity of coloring matter in a solution by measurement of transmitted light. See also colorimeter.

spec·tro·pho·tom·e·ter

(spek'trō-fō-tom'ĕ-tĕr), An instrument for measuring the intensity of light of a definite wavelength transmitted by a substance or a solution, giving a quantitative measure of the amount of material in the solution absorbing the light; a colorimeter with a choice of wavelength and photometric measurement. [spectro- + photometer]

spec·tro·pho·tom·e·ter

(spek'trō-fŏ-tom'ĕ-tĕr) An instrument for measuring the intensity of light of a definite wavelength transmitted by a substance or solution, giving a quantitative measure of the amount of material in the solution absorbing the light; a colorimeter with a choice of wavelengths and photometric measurements.

spectrophotometer

An instrument for measuring the relative intensities of the spectrum, wavelength by wavelength. Specifically it measures the spectral transmission factor (i.e. the ratio of radiant flux transmitted through a medium to that incident on it) of a medium for a given wavelength. This factor is usually plotted as a graph against many wavelengths providing a spectral transmission curve. Ophthalmic lenses, contact lenses and any other substances (e.g. tear lipids) through which light may be passed can thus be analysed. See density.

spectrophotometer

spec·tro·pho·tom·e·ter

spectrophotometer

spec•tro•pho•tom•e•ter

spectrophotometer

spectrophotometer,

spectrophotometer

Spectrophotometer

spectrophotometer

spectrophotometer

spectrophotometer

spectrophotometer

spec·tro·pho·tom·e·ter

spec·tro·pho·tom·e·ter

spectrophotometer

spectrophotometer

Words related to spectrophotometer

noun a photometer for comparing two light radiations wavelength by wavelength

Related Words