Robin E Bentley 2000 Meas. Sci. Technol. 11 538 doi:10.1088/0957-0233/11/5/314
A thermoelectric scanning facility for the study of elemental thermocouples
Robin E Bentley
Show affiliationsA scanning facility for studying the thermoelectric behaviour of the metals used in elemental thermocouples (Au, Pt and Pd) is described. The facility effectively measured changes in Seebeck coefficient along a 560 mm length of each of three wires, relative to a fourth, by moving them through a 50 mm long, EMF-producing zone into a uniform-temperature region at 250 °C. The uniform region was stable to within 0.7 mK and EMF measurements were made to 10 nV (equivalent to about 1 mK). Accordingly, the facility is able to detect changes of ~10 ppm in Seebeck coefficient. The precautions necessary to work at this accuracy are detailed and preliminary data on the changes that occur at temperatures up to 1000 °C are reported. For example, the measured Seebeck coefficient of Pd decreased at temperatures in the range 550 to 850 °C, a change opposite in sign to that previously reported.
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Issue 5 (May 2000)
Received 19 January 2000, accepted for publication 10 March 2000, in final form 10 March 2000
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A thermoelectric scanning facility for the study of elemental thermocouples
Robin E Bentley 2000 Meas. Sci. Technol. 11 538
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