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Thermoelectrics

Heat waste recovery / Thermoelectric-Generators (TEG) / Peltier-Elements / Sensorics

Thermoelectricity describes the mutual influence of temperature and electricity in a material and is based on three basic effects: the Seebeck-effect, the Peltier-effect and the Thomson-effect. The Seebeck-effect was discovered in 1821 by Thomas J. Seebeck, a German physicist, and describes the occurrence of an electric field when applying a temperature gradient in an electrically insulated conductor. The Seebeck coefficient S is defined as the quotient of the negative thermal voltage and the temperature difference and is a purely material-specific variable, which is usually given in the unit μV / K.

Conversely, this effect, called the Peltier-effect, causes a temperature gradient when applying an external current to the conductor. This phenomenon is due to the different energy levels of the conduction bands of the materials involved. Thus, as they pass from one material to another, the charge carriers must either absorb energy in the form of heat, thereby cooling the pad, or they can release energy in the form of heat, thereby heating the pad.

With fossil fuels becoming increasingly scarce and recent global warming gains from rising carbon dioxide emissions, the field of thermoelectricity has returned to public interest because of its effective use of waste heat. The aim is to use the waste heat of heat engines, such as automobiles or conventional power plants, by thermoelectric generators (TEG) to increase their conversion efficiency. But also for cooling applications by means of the Peltier effect, such as the thermostatic temperature-critical components in lasers, efficient thermoelectric materials are of great interest.

The thermoelectric conversion efficiency of a material is usually compared on the basis of the dimensionless figure of merit ZT. It is calculated from the Thermal Conductivity , the Seebeck-Coefficient and the Electrical Conductivity.

To cope with this development, we have developed an instrument for simple and extremely precise material characterization. The Linseis LSR-3 can determine both, the Seebeck-Coefficient and the Electrical Resistivity of a sample in a temperature range from -100°C to +1500°C in a single measurement.

Thermoelectric Applications

Linseis Products for Thermoelectrics

Seebeck-Coefficient / Resistivity / TEG and Peltier Modules / Thin Films

LSR-3

LSR-3

Most advanced Seebeck Coefficient and Electric Resistivity (LSR) characterization of Bulk material and Thin-Films

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LZT-Meter

LZT-Meter

Combined LFA (Thermal Conductivity/Diffusivity) + LSR (Seebeck Effect and Electric Resistivity) for a complete ZT-Characterization

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TFA

Linseis TFA

TFA – Thin Film Analyzer – Latest generation Lab-on-a-Chip technique with complete figure of merit ZT-Characterization of Thin-Films from the nm to µm range from -170°C up to 280°C

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LFA 500

LFA-500

LFA 500 – LightFlash Analyzer – The robust workhorse. Thermal diffusivity measurements in the temperature range -100°C up to +1250°C.

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LFA 1000

LFA-1000

LFA 1000 – True LaserFlash Analyzer – The premium device. Thermal diffusivity measurements in the temperature range from -125°C up to +2800°C.

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L79 HCS

Linseis Hall L79 HCS

The L79/HCS System permits the characterization of semiconductor devices, it measures: mobility, resistivity, charge carrier concentration and Hall coefficient

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TF-LFA

Linseis TF-LFA

TF-LFA – Time Domain Thermoreflectance (TDTR) – Thermal Diffusivity of Thin Films in the temperature range from -100°C up to 500°C.

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Tel.: +49 (9287) 880-0
E-Mail: info@linseis.com

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Linseis Produktbroschüre Thermal Electrics

Thermoelectric Brochure
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Linseis Product Overview English

Overview Brochure
ENGLISCH (1Mb)

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