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A thermocouple needs two different metals (Seebeck-effect). No, this is wrong! What you need is: two metal stripes or wires with different thermal diffusion voltages.

Aluminum is not well suited.But pure iron is well. The thermovoltage of a pure iron thermocouple is in the range of 1...3µV/°K (similar to Pt-Pd-thermocouple). Advantages of this pure iron thermocouple: it still needs some research for this new type of thermocouple.

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