摘要
文中介绍了热电偶的热电势—温度特性的线性化处理方法及相关的电路设计原理。将热电势—温度特性用幂级数展开，去掉高次项，保留到二次项，将标准刻度表中的数据代入到方程中，用计算机模拟计算确定相关系数。根据所得方程，利用线性放大器、模拟乘法器及加法器等实现线性化处理。理论和实验证明，利用这种方法，对Ｓ型热电偶在８００～１４００℃之间实行线性化处理，所得非线性误差可以控制到０．１％以下。
In this paper, the linear treatment method and the correlative circuit-design theory of the thermal potential-temperature character of the thermocouple are introduced. Spread the thermal potential-temperature with exponential progression, throwing off the high power term and saving the square term. We can get the square equation. Substitute the data from standard graduation table into the equation, and then confirm the coefficient with computer simulation. Based on this equation, using linearity-amplifier, multiplicative implement and additive implement,the potential-temperature charscter of the thermocouple can be achieved to linear treatment. Theory and experiment show that nonlinearly error for S- thermocouple among temperature 800℃～1400℃,can be controlled under 0.1% with this method.
出处
《仪表技术与传感器》
CSCD
北大核心
1999年第4期31-32,38,共3页
Instrument Technique and Sensor
