Abstract
A simple method is described for combining two thermocouple EMFs such that over any chosen range, the quadratic temperature-dependence term is eliminated. The resulting 'linear' output is suitable for many applications, such as thermoluminescence, differential thermal analysis (DTA) and ionic thermocurrents (ITC), where a virtually constant heating rate can be produced using this thermoelectric monitor and a voltage ramp feedback control. The characteristics are given over the range -100 to 0 degrees C for a combination of iron/constantan with 0.885 potentially divided copper/constantan, and a circuit is demonstrated whereby the sensor junctions of the combination are reduced to a single three-wire electrical contact.
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