Introduction to Thermoelectricity by H. Julian Goldsmid

Author:H. Julian Goldsmid
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

We shall discuss the determination of the thermal conductivity by measuring the figure of merit later and we shall also devote a section to thermal diffusivity measurements. However, we shall now discuss a method that has come into prominence in recent years and that is useful in work on thin specimens of poor heat conductors. This is the 3ω technique [15], so called because the heat input varies with time at an angular frequency ω and the analysis is based on the observation of an electrical signal at the frequency 3ω. Radial flow methods are useful in reducing losses by thermal radiation but they often need large samples to be available. The 3ω system is suitable for use on small specimens. The essential features of the experimental arrangement sample are shown in Fig. 8.11.

Fig. 8.11Arrangement of the metal strip and side arms on the sample in the 3ω method

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