Both advantages of thermocouple temperature measurement related research methods1

Thermocouple temperature measurement principle is based on thermoelectric effect, conductor A and B of two different material concatenated into A closed loop, when the temperature of the two contact is not at the same time, can produce thermoelectric emf in the loop, and have A certain size of the current in the circuit, this kind of phenomenon called the thermoelectric effect. Thermoelectric emfs is composed of two conductor contact potential ( Peltier potential) And the single conductor temperature potential ( Electromotive force) . The size of the thermoelectric emfs and two related to the nature and junction temperature of conductor materials.

thermocouple temperature measurement has two advantages, one is the upper limit of up to 1800 ℃ temperature. Second, the response speed is fast. Because of the thermocouple is small in size, small heat capacity, especially in nude thermocouple, instant contact can be reflected by measuring point temperature. If using thermocouple to measure components, integrated circuits, such as radiator temperature conveniently.

the used K type thermocouple. Composition of nickel and chromium and nickel alloy, its average about 407 mu V / ℃, the temperature difference electromotive force its nonlinear under 230 ℃ can be ignored. S, B type thermocouple consists of platinum and platinum rhodium, the thermoelectric potential is about 7 ~ 15 mu V / ℃, although its thermoelectric power is small, nonlinear is bigger, but can be used for measuring high temperature above 1300 ℃, and not easy to be oxidized, for industrial temperature measurement of choice, but in the circuit must be nonlinear error compensation. Such as using the broken line approximation method, the look-up table method, reduce the nonlinear error to the allowed range.

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