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本文对热电偶在测温系统中存在的非线性问题进行了分析，给出了非线性校正的方法，提高了测温的精度，并将其成功地应用在燃油退火炉的温度控制系统中。
In this paper, the non-linearity of the thermocouple in the temperature measurement system is analyzed. The method of nonlinear correction is given and the accuracy of the temperature measurement is improved. The method is successfully applied in the temperature control system of the fuel annealing furnace.