LSR thermoelectrics

Advantages

The LSR can simultaneously measure both the Seebeck coefficient and the electrical resistance (thermal conductivity and ZT using the Harman method).

• Prismatic and cylindrical samples with a length between 6 and 23 mm can be analyzed (prismatic samples required for the Harman method)
• Wires and foils can be analyzed with a special measuring adapter
• Four different interchangeable ovens cover the temperature range from -100°C to 1500°C
• The design of the sample holder guarantees maximum reproducibility of the measurements
• State-of-the-art software enables automatic measurement sequences
• Harman option
  
  

Four different interchangeable ovens cover the temperature range from -100° to 1500°C.
In addition, the infrared ovens enable very high heating and cooling rates and the advantage of the most precise temperature control according to the set temperature profile.

Measuring principle

A cylindrical or prism-shaped sample is placed vertically between two electrodes.
The lower electrode block contains a heater, while the entire measuring arrangement is located in a furnace.
The furnace surrounding the measuring arrangement heats the sample to a certain temperature.
At this temperature, the secondary heater in the lower electrode block generates a specific temperature gradient.
Two contacting thermocouples then measure the temperature gradient T1 and T2.
A unique thermocouple contact mechanism enables measurements of the electromotive force dE on one wire of each of the two thermocouples with maximum temperature accuracy.
The DC quadripole method is used to measure the electrical resistance.
A constant current (I) is applied to both ends of the sample and the change in voltage (dV) between one wire on each of the two thermocouple pairs is measured.