Discussion
Which is the most linear temperature transducer ?
Answer: C
The IC sensor is the most linear temperature transducer, option (C). Integrated circuit sensors such as the AD590 or LM35 are built on the nearly linear dependence of the base-emitter voltage difference of two transistors on absolute temperature, and they give an output of a fixed number of microamperes or millivolts per kelvin. A thermocouple, option (A), has a nonlinear emf and needs tables or a correction. An RTD, option (B), is fairly linear but has a slight curvature. A thermistor, option (D), is strongly nonlinear, being exponential in temperature.
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