How do you convert temperature to voltage?

This is in a sense the reciprocal or converse function of the equation for converting voltage to temperature:

For all types of thermocouples (except K at t>0°C), we have:

$$ V(mV) = \mathop \sum \limits_{i = 0}^n {\left( {{t_{90}}} \right)^i} $$

For type K thermocouples at temperatures above 0°C, we have:

$$ T\left( {^\circ C} \right) = {T_{inf}}\left( {^\circ C} \right) + \frac{{V – {V_{inf}}}}{{{V_{sup}} – {V_{inf}}}} $$

Ci = Coefficients from C0 to Cn

t90 = Temperature of the thermocouple in °C

a0 to a2 = Specific coefficients of exponentiation only for type K thermocouples and temperatures above 0 °C

e= natural logarithm constant: 2.71828…

VOLTAGE OF DIFFERENT THERMOCOUPLES FOR A TEMPERATURE OF 350 °C