Dear All,

I am trying to calibrate my pyrometer (non-contact, infrared temp. meter).
Could anyone please suggest a function which would describe the following data set and later use it to interpolate the data within the given range of -7 to 600 deg. Obviously, I need R^2 as close to 1 as possible.

I just need a mathematical function which describes these values.

Measurement results:

Temp [deg. C] Output voltage [uV]
-7 20494
600 20755
700 20974
800 21285
900 21696
1000 22282
1100 22871
1200 23534
1300 24333
1400 25161
1500 26078
1600 27074
1680 28031
1700 28251



I cannot use polynomials.
Would prefer a power function, exponential growth function or any other function resembling Planck's Law.

Thank you very much in advance for any comments/suggestions/criticism/anything.

Peter Drawa