LSR -3 Linseis - Seebeck Coefficient & Electric Resistivity Unit
Seebeck Coefficient / Electric Resistance measurements from -100 up to 1500°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”.
- The LSR - 3 can simultaneous measure both Seebeck coefficient and electric resistance (resistivity measurement).
- Prism and cylindrical samples with a length between 5 to 23 mm 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 1500°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, while the entire measuring arrangement is located in a furnace. The furnace surrounding the measuring arrangement heats the sample to a specifi ed 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 temperature 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 Resi- stance. 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 pairs.
|Temperature range*:||-100°C up to 500°C|
|RT up to 800/1100/1500°C|
|Measurement method:||Seebeck coefficient: Static DC method|
|Electric resistance: Four-terminal method|
|Atmosphere:||inert, red., oxid., vac.|
|Sample size (cylindrical or bar shape):||2 to 4 mm in width and depth or 5 in diameter and up to 23 mm in height (other dimensions on request)|
|Sample size round (disc shaped):||10, 12.7, 25.4 mm|
|Lead interval:||4, 6, 8 mm|
* different exchangeable furnaces
All LINSEIS thermo analytical instruments are PC controlled. The individual software modules exclusively run under Microsoft® Windows® operating systems. The complete software consists of 3 modules: temperature control, data acquisition and data evaluation. The 32 bit software incorporates all essential features for measurement preparation, execution, and evaluation of a LSR-3 measurement. Thanks to our specialists and application experts, LINSEIS was able to develop comprehensive easy to understand user friendly application software.
- Program capable of text editing
- Repetition measurements with minimum parameter input
- Evaluation of current measurement
- Curve comparison up to 32 curves
- Curve subtraction
- Multi-methods analysis (DSC TG, TMA, DIL, etc.)
- Zoom function
- 1. and 2. Derivative
- Complex peak evaluation
- Multipoint calibration for sample temperature
- Multipoint calibration for change of enthalpy
- Cp calibration for heat flow
- Storage and export of evaluations
- Export and import of data ASCII
- Data export to MS Excel
- Signal-steered measuring procedures
- Zoom in function
Semiconductors, Metals & Alloys
Automotive / Aviation / Aerospace, Research, Development and Academia, Semiconducting industries / Sensors / Thermoelectric Generators / Cooling devices
A typical thermoelectric material from the telluride family has tested in the temperature range from RT up to 200°C. You can see the electric resistivity and Seebeck coefficient over the temperature.
Different Accessories are available for the Linseis LSR-3:
- Four different furnaces:
- -100°C up to 500°C
- RT up to 800°C
- RT up to 1100°C
- RT up to 1500°C
- Different sample geometries can be measured
- Cylindric or rectangle sample
- With the new adapter flat discs can be measured, so you can do a complete ZT (figure of merit) determination at one sample using Linseis LSR-3 and Linseis LaserFlash LFA 1000 or XenonFlash XFA 300/600
- ../../fileadmin/user_upload/LINSEIS_Thermal_electrics_v2.pdf (2.0 M Bytes)
- ../../fileadmin/user_upload/LINSEIS_LSR_v5.pdf (2.5 M Bytes)