polarization

(redirected from polarisation)
Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

polarization

, polarisation
Physics the process or phenomenon in which the waves of light or other electromagnetic radiation are restricted to certain directions of vibration, usually specified in terms of the electric field vector

polarization

(poh-lă-ri-zay -shŏn) The degree to which the orientation of the electric or magnetic vector in electromagnetic radiation is predictable over time. In a partially polarized wave, the vector thus shows a less random orientation in the plane perpendicular to the direction of wave motion than occurs in an unpolarized (normal) wave. Waves in which the electric vectors are entirely vertical or horizontal with respect to the direction of motion are described as vertically or horizontally plane (or linearly) polarized. In general, both polarizations are present with a relative phase difference and the wave is then elliptically polarized in the right-handed or left-handed sense accordingly as the resultant vector rotates clockwise or counterclockwise when viewed along the direction of motion of the wave; in the case where the resultant vector rotates and its magnitude remains constant, the wave is circularly polarized.

Polarization is a measure of the way in which light or other electromagnetic radiation from a celestial body is affected by factors such as scattering due to cosmic dust or strong stellar or interstellar magnetic fields, or reflection from a surface. Radio emissions from celestial sources are usually partially polarized, i.e. the waves can be considered to be composed of a completely unpolarized component plus a small polarized component. Synchrotron emission, however, may be strongly polarized. The general situation is described by the four Stokes parameters (I, Q, U, and V ), which are defined in such a manner that specifying their four values uniquely describes the state of polarization: I is a measure of the total power in the wave, Q and U define the degree of linear polarization, and V that of circular polarization. All four have dimensions of flux density. See also Faraday rotation; interstellar polarization.

polarization

[‚pō·lə·rə′zā·shən]
(electricity)
The process of producing a relative displacement of positive and negative bound charges in a body by applying an electric field.
A vector quantity equal to the electric dipole moment per unit volume of a material. Also known as dielectric polarization; electric polarization.
A chemical change occurring in dry cells during use, increasing the internal resistance of the cell and shortening its useful life.
(physics)
Phenomenon exhibited by certain electromagnetic waves and other transverse waves in which the direction of the electric field or the displacement direction of the vibrations is constant or varies in some definite way. Also known as wave polarization.
The direction of the electric field or the displacement vector of a wave exhibiting polarization (first definition).
The process of bringing about polarization (first definition) in a transverse wave.
Property of a collection of particles with spin, in which the majority have spin components pointing in one direction, rather than at random.
References in periodicals archive ?
Professor Min Gu, Director of the Centre for Micro-Photonics at Swinburne, who was also involved in the research, said: "We have created a new recording device that can respond to different colour and different polarisation.
In their paper, the researchers were able to record three layers of information, using three different wavelengths and two polarisations.
The polarisation refers to the situation when the middle class gets clustered towards the poles or in other words the incomes of any income distribution get closer to one or both extremes.
To measure the extent of polarisation in Pakistan, its rural and urban segment, its provinces and rural urban segments of each province at micro level during the period 1992-93 to 2001-02.
To compare the trends in polarisation and income inequality in Pakistan, its rural and urban segment at micro level during the period 1992-93 to 2001-02.
Section 2 presents the framework of analysis covering the methodological issues in the measurement of polarisation.
In this section we will cover the methodological issues like data selection, choice of income unit and selection of polarisation measure.
Per-adult equivalent will provide the accurate and true picture of polarisation by incorporating household size, while household as the income unit will give good picture of polarisation among aggregate household incomes.
The company's key patented invention is the Polarisation Activated Microlens that enables a polarization switch to be used to switch between normal 2D and auto stereoscopic 3D viewing modes.
Polarisation Activated Microlens is a trademark of Ocuity Limited.