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热电偶是应用非常广泛的温度传感器。在电厂生产过程中的主蒸汽温度、过热器管壁温度、高温烟气温度等都采用热电偶测量的。由热电偶温度与热电势的实验数据可知热电偶温度与热电势的关系属非线性。如何建立热电偶温度t与热电势v间的数学模型是人们十分关注的问题。因为它便于编成适当的程序送入计算机,从而立即输出温度或热电势值以及深入研究温度与热电势间的函数性态。我国目前工业上常用的热电偶有EU-2,EA-2,LB-3等型号,本文主要以数理统计、线性代数等理论为工具建立上述型号的热电偶温度与热电势的数学模型。
Thermocouples are widely used temperature sensors. The main steam temperature in the power plant production process, superheater tube wall temperature, high temperature flue gas temperature are measured by thermocouple. The experimental data from the thermocouple temperature and the thermoelectric power shows that the relationship between the thermocouple temperature and the thermoelectric power is non-linear. How to establish a mathematical model of the thermocouple temperature t and the thermoelectric power v is a matter of great concern. Because it is easy to program the appropriate program into the computer, which immediately output temperature or thermoelectric potential value and in-depth study of temperature and thermoelectric power function state. At present, there are EU-2, EA-2, LB-3 and other types of thermocouples commonly used in industry in our country. In this paper, mathematical models of the thermocouple temperature and thermoelectric power of the above models are established by using the theories of mathematical statistics and linear algebra as tools.