Whats the difference between a thermistor and a thermocouple?
Thermistors vary their resistance to changes in temperature. Since exhaled air is warmer than inhaled air, the resistance values reflect changes in air temperature. These resistance values are sent to the recording system as sinusoidal waveforms (normal airflow). Thermistors require a small power source to produce a signal. Thermocouples are two dissimilar types of metal which produce a change in voltage potential in response to changes in air temperature. Thermistors are preferred over thermocouples for airflow measurement for two reasons: (1) thermistors provide a stronger quality signal; and (2) thermistors are linear response temperature devices whereas thermocouples are not.
Many differences between the thermistors and thermocouples. Thermistors are one type of resistors that are used as temperature sensors, self-resetting overcurrent protectors, and self-regulating heating elements. And, A thermocouple is a temperature measuring device that is a type of temperature sensor for control and measure temperature. It also used for many purposes like convert temperature gradient into electricity.
