Abstract
We report on an experimental setup for the simultaneous measurement of the thermoelectric power (TEP) of two samples in the temperature range from 77 K to 500 K using optimum electronic instruments. The setup consists of two rectangular copper bars in a bridge arrangement for sample mounting, two surface mount (SM) chip resistors for creating alternate temperature gradient, and a type E thermocouple in differential geometry for gradient temperature (Delta T) measurement across the samples. In addition, a diode arrangement has been made for the alternate heating of SM resistors using only one DC current source. The measurement accuracy of Delta T increases with the differential thermocouple arrangement. For the calibration of the setup, measurements of TEP on a high purity (99.99%) platinum wire and type K thermocouple wires Chromel and Alumel have been performed from 77 K to 500 K with respect to copper lead wires. Additionally, this setup can be utilized to calibrate an unknown sample against a sample of known absolute TEP. (C) 2014 AIP Publishing LLC.
| Original language | English |
|---|---|
| Article number | 085115 |
| Number of pages | 7 |
| Journal | Review of Scientific Instruments |
| Volume | 85 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - Aug 2014 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- MAGNETIC-FIELDS
- THERMOPOWER