Seebeck effect


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Seebeck effect:

see thermoelectricitythermoelectricity,
direct conversion of heat into electric energy, or vice versa. The term is generally restricted to the irreversible conversion of electricity into heat described by the English physicist James P.
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Seebeck effect

The generation of a temperature-dependent electromotive force (emf) at the junction of two dissimilar metals. This phenomenon provides the physical basis for the thermocouple. In 1821, T. J. Seebeck discovered that near a closed circuit composed of two linear conductors of two different metals a magnetic needle would be deflected if, and only if, the two junctions were at different temperatures, and that if the temperatures of the two junctions were reversed the direction of deflection would also be reversed. He investigated 35 different metals and arranged them in a series such that at a hot junction, current flows from a metal earlier in the series to a later one. See Electromotive force (emf)

A thermocouple consists of a pair of wires of dissimilar metals, joined at the ends. One junction is kept at an accurately known cold temperature, usually that of melting ice, and the other is used for the measurement of an unknown temperature, by measuring the emf generated as a result of the Seebeck effect. See Thermocouple, Thermoelectricity

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.

Seebeck effect

[′zā‚bek i‚fekt]
(electronics)
The development of a voltage due to differences in temperature between two junctions of dissimilar metals in the same circuit.
(graphic arts)
A photographic emulsion that is exposed until a faint visible image appears, and is then exposed to colored light and takes on the color of the light to which it is exposed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The thermoelectric cooling phenomenon is physically based on the Peltier effect, which was discovered by Jean Peltier in 1834-13 years after the Seebeck effect was unveiled (10).
Thermoelectric [TE] devices harvest energy developed from temperature differences via the Seebeck effect, i.e., a temperature difference at the junction of two metals or semiconductors causes current to flow across the junction.
His life and work, particularily the discovery of the thermoelectric effect (the Seebeck effect), is described by Enn Velmre in the first paper of this issue.
Wireless Industrial Technologies, an Oakland, Calif., company cofounded by Wright, uses energy scavengers that take advantage of the Seebeck effect, in which certain metals develop voltages when one end is hotter than the other.
A: The technology being used is the Seebeck effect, using semiconductor devices that are not batteries but arrays of tiny elements that convert heat flow directly into electrical current.
The technique for finding open conductors is called Seebeck Effect Imaging.
The thermoelectric (TE) phenomena can provide the direct conversion of applied temperature gradient into electricity (the Seebeck effect) or electricity into temperature difference (the Peltier effect).
It may be that the magnetothermopower from polycrystalline [Sr.sub.2-x][La.x]FeMo[O.sub.6] and [Ba.sub.2]FeMo[O.sub.6] arises from a spin- dependent Seebeck effect. This type of magnetothermopower has been reported in magnetic tunneling junctions where one or more of the layers are ferromagnetically ordered and display electronic spin polarization [16, 17].
We call the first phenomenon the Seebeck effect, where electrical voltage is developed when there is a gradient of temperature between the terminals and was discovered by Seebeck in 1821 while the second is just converse effect of the first one and it was discovered by Peltier in 1834 [1].
All low-level signals are subject to thermally induced voltage offsets based on the Seebeck effect. A junction of dissimilar metals, such as found in reed relays, produces a small voltage when a temperature gradient exists along the length of the conductors.
Theoretical researches demonstrated that ultrafast photoresponse processes should be attributed to anisotropy diffusion and Seebeck effect. Researches also demonstrated that the concentrations of lanthanide of the samples could modulate the photoresponse signals in nanometer size domain tilted thin films, which indicate a new type nanometer scale photosensitive source.
Thermoelectric generators (TEGs) are used to harvest ambient heat energy and generate an electrical voltage through the Seebeck effect [1].