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To achieve accurate temperature measurement it is important to select the right sensor. For high temperatures, a thermocouple is often selected. The signal level from this sensor is very low and very nonlinear. For relative measurements, one must select a thermocouple that exhibits a relatively linear voltage response over the temperature range of interest. For absolute measurements, one must use cold junction compensation to establish a reference temperature for the measurement. In all cases, linearization is required. The simplest and most common method to accomplish this is to digitize the analog output and adjust the value using a lookup table specific to the thermocouple type which is based on a specific metal combination. The optimal amplifier requirements for this application are very low offset voltage, low noise and very low drift. Renesas has several amplifiers that are excellent for this application.
