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Thermocouples, dissimilar metals?

  1. Oct 23, 2011 #1
    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.
     
  2. jcsd
  3. Dec 2, 2011 #2
    Re: Thermocouples, dissimilar metals??

    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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