Thermocouples, dissimilar metals?

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SUMMARY

Thermocouples require the use of two dissimilar metals to generate a voltage that correlates with temperature differences. The choice of metals is crucial, as it involves understanding their work functions, resistivity, thermal coefficients, and conductivity. Common types of thermocouples, such as Type T and Type K, are recommended for optimal performance. Selecting the right combination of metals directly impacts the accuracy and efficiency of the thermopile being constructed.

PREREQUISITES
  • Understanding of thermoelectric principles
  • Familiarity with thermocouple types, specifically Type T and Type K
  • Knowledge of metal properties, including work functions and thermal coefficients
  • Basic concepts of electrical conductivity and resistivity
NEXT STEPS
  • Research the specific properties of metals used in thermocouples, focusing on work functions
  • Explore the differences between Type T and Type K thermocouples
  • Learn about the construction and application of thermopiles
  • Investigate the impact of thermal coefficients on thermocouple performance
USEFUL FOR

Engineers, physicists, and hobbyists interested in thermocouple design and thermopile applications will benefit from this discussion.

microG
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Thermocouples, dissimilar metals??

Hello everyone, this is my first post so go easy on me.

Looking into making a thermopile and trying to decide what two metals to use, everywhere I look for thermocouple theory it says two dissimilar metals.

My question is in what respect do they have to be dissimilar? resistivity, thermal coefficients, conductivity?

Cheers, Graham.
 
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http://en.wikipedia.org/wiki/Thermocouple

There are well-known choices that tend to give the best results which are designated by a "type" such as Type T or K (probably the most common) or other types listed in the ilke above. It has to do with metal work functions which are an intrinsic parameter of a metal.
 

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