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热敏电阻器阻值和温度是非线性关系。在实际应用中,往往要求由热敏电阻器作为传感器的输出电流、电压等物理量与被测温度之间具有较严格的线性关系。本文进一步对负温度系数热敏电阻器电桥输出量的线性化问题进行探讨。一、线性近似不平衡电桥的组成见图1所示。图中,E为电源电压;V(T)为输出电压;R_2、R_3、R_4为桥臂固定电阻;而R_T=R_(T1)e~B(1/T-1/T_1)为负温度系数热敏电阻器在绝对温标T时的阻值,其中R_(T1)是R_T在温度T_1时的阻值,
Thermistor resistance and temperature are non-linear. In practice, it is often required to have a more stringent linear relationship between the physical quantities such as the output current and voltage of the thermistor as the sensor and the measured temperature. This paper further discusses the linearization of the negative temperature coefficient thermistor bridge output. First, the linear approximation of the composition of unbalanced bridge shown in Figure 1. In the figure, E is the power supply voltage; V (T) is the output voltage; R_2, R_3, R_4 are the fixed resistor of the arm bridge; And R_T = R_ (T1) e ~ B (1 / T_1 / T_1) Thermistor temperature resistance in the absolute T when the resistance, where R_ (T1) is the resistance of R_T at temperature T_1,