Normal spectrum
Spectrum Spec"trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster]

2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed or studied either as spread out on a screen, by direct vision, by photography, or otherwise. See Illust. of {Light}, and {Spectroscope}. (b) A luminous appearance, or an image seen after the eye has been exposed to an intense light or a strongly illuminated object. When the object is colored, the image appears of the complementary color, as a green image seen after viewing a red wafer lying on white paper. Called also {ocular spectrum}. [1913 Webster]

{Absorption spectrum}, the spectrum of light which has passed through a medium capable of absorbing a portion of the rays. It is characterized by dark spaces, bands, or lines.

{Chemical spectrum}, a spectrum of rays considered solely with reference to their chemical effects, as in photography. These, in the usual photogrophic methods, have their maximum influence at and beyond the violet rays, but are not limited to this region.

{Chromatic spectrum}, the visible colored rays of the solar spectrum, exhibiting the seven principal colors in their order, and covering the central and larger portion of the space of the whole spectrum.

{Continous spectrum}, a spectrum not broken by bands or lines, but having the colors shaded into each other continously, as that from an incandescent solid or liquid, or a gas under high pressure.

{Diffraction spectrum}, a spectrum produced by diffraction, as by a grating.

{Gaseous spectrum}, the spectrum of an incandesoent gas or vapor, under moderate, or especially under very low, pressure. It is characterized by bright bands or lines.

{Normal spectrum}, a representation of a spectrum arranged upon conventional plan adopted as standard, especially a spectrum in which the colors are spaced proportionally to their wave lengths, as when formed by a diffraction grating.

{Ocular spectrum}. See {Spectrum}, 2 (b), above.

{Prismatic spectrum}, a spectrum produced by means of a prism.

{Solar spectrum}, the spectrum of solar light, especially as thrown upon a screen in a darkened room. It is characterized by numerous dark lines called Fraunhofer lines.

{Spectrum analysis}, chemical analysis effected by comparison of the different relative positions and qualities of the fixed lines of spectra produced by flames in which different substances are burned or evaporated, each substance having its own characteristic system of lines.

{Thermal spectrum}, a spectrum of rays considered solely with reference to their heating effect, especially of those rays which produce no luminous phenomena. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • normal spectrum — gardelinis spektras statusas T sritis fizika atitikmenys: angl. grating spectrum; normal spectrum vok. Gitterspektrum, n; Normalspektrum, n rus. дифракционный спектр, m; нормальный дифракционный спектр, m pranc. spectre de réseau, m; spectre… …   Fizikos terminų žodynas

  • normal spectrum — normalusis spektras statusas T sritis fizika atitikmenys: angl. grating spectrum; normal spectrum vok. Gitterspektrum, n; Normalspektrum, n rus. нормальный спектр, m pranc. spectre normal, m …   Fizikos terminų žodynas

  • Spectrum — Spec trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster] 2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and observed… …   The Collaborative International Dictionary of English

  • Spectrum analysis — Spectrum Spec trum, n.; pl. {Spectra}. [L. See {Specter}.] 1. An apparition; a specter. [Obs.] [1913 Webster] 2. (Opt.) (a) The several colored and other rays of which light is composed, separated by the refraction of a prism or other means, and… …   The Collaborative International Dictionary of English

  • Normal People Scare Me — Cover of DVD Directed by Keri Bowers, Taylor Cross Produced by Joey Travolta …   Wikipedia

  • Spectrum (functional analysis) — In functional analysis, the concept of the spectrum of a bounded operator is a generalisation of the concept of eigenvalues for matrices. Specifically, a complex number λ is said to be in the spectrum of a bounded linear operator T if… …   Wikipedia

  • Spectrum analyzer — A spectrum analyzer Spectrum analyzer display A spectrum analyzer measures the magnitude of an input signal versus frequency with …   Wikipedia

  • Normal matrix — A complex square matrix A is a normal matrix if where A* is the conjugate transpose of A. That is, a matrix is normal if it commutes with its conjugate transpose. If A is a real matrix, then A*=AT. Hence, the matrix is normal if ATA = AAT.… …   Wikipedia

  • Normal mode — For other types of mode, see Mode (disambiguation). Vibration of a single normal mode of a circular disc with a pinned boundary condition along the entire outer edge. See other modes. A normal mode of an oscillating system is a pattern of motio …   Wikipedia

  • normal — 1. (normal) (833↑, 144↓) A word made up by this corrupt society so they could single out and attack those who are different Normal is nothing but a word made up by society Author: Bill http://normal.urbanup.com/1470557 2. (normal) (517↑, 89↓) a… …   Urban English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”