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Temperature range -100 up to 500°C, RT up to 800°C and
RT up to 1100°C. The Thermal power,
thermoelectric power, or Seebeck coefficient of a material measures the
magnitude of an induced thermoelectric voltage in response to a temperature
difference across that material. The thermal power has units of (V/K).
In recent years
much interest has been shown in various methods of direct conversion of heat
into electricity. Waste heat from hot engines and combustion systems could save
billions of dollars if it could be captured and converted into electricity via
thermoelectric devices For this
challenging application Linseis has developed a characteristic evaluating
instrument for these materials and devices; the LSR -3 “Linseis - Seebeck &
Electric Resistivity Unit”.
Features
The LSR - 3 can
simultaneous measure both Seebeck coefficient and electric resistance
(Resistivity).
- Prism and cylindrical samples
with a length between 6 to 22mm can be analyzed
- Wires and Foils can be analyzed
with a unique measurement adapter
- Three different exchangeable
furnaces cover the temperature range from -100 up to 1100°C
- The design of the sample holder
guarantees highest measurement reproducibility
- State of the art 32-Bit
software enables automatic measurement procedures
- Measurement Data can be easily
exported
Principles of
Measurement A sample of
cylindrical or prism shape is vertically positioned between two electrodes. The
lower electrode block contains a heater, whilst the entire measuring arrangement
is located in a furnace.
The furnace surrounding the measuring arrangement
heats the sample to a specified temperature. At this temperature the secondary
heater in the lower electrode block creates a set temperature gradient. Two
contacting thermocouples then measure the temperature gradient T1 and T2. A
unique thermocouple contact mechanism permits highest accuracy measurements of
the electromotive force dE at one wire of each of the two thermocouples.
The dc
four-terminal method is used to measure the Electric Resistance. By applying a
constant current (I) at both ends of the sample and measuring the change in
voltage dV between one wires at each of the two thermocouple pares.
Specifications
Temperature
range* |
- 100 to
500°C, RT up to 800°C, RT up to 1100°C |
Specimen
holder |
Sandwiched
between two electrodes |
Measurement
method |
Seebeck
coefficient: Static dc method
Electric resistance: Four-terminal
method |
Atmosphere |
inert, oxid.,
red., vac. |
Sample
size |
2 to 4 mm
square or diameter x 6 to 23 mm long (maximum) |
Lead
interval |
4,6,8
mm |
Cooling water
requirements |
required |
* different furnaces available