测温传感器在数字仪表中的线性化

Linearization of Temperature Sensors in Digital Meters

利用A/D转换器的转换特性及特殊的桥路,可使各种测温传感器的非线性得到线性化补偿,这种方法被称谓“变尺度量”原理。本文在铜、铂传感器测温电路中论证了这种线性化原理的正确性。通过微机计算和实验也证实了这种线性化后达到的精度及组成测温仪表后带来的各种特点。此外又提出这个原理对微机数据采集中的非线性校正,也是一种较好的方法。

Through the conversion characteristics of A/D converter and with the specific bridge-circuit, the non-linearity of various temperature sensors are able to be compensated. The method introduced here is called 'changeable measures' principle. This paper has proved the exactness of this linearzation principle in the measuring temperature circuit of Cu & Pt temperature sensors. Calculations of microcomputers and the experiments have also proved the accuracy obtained throngh this lineari zation and various properties brought about after making up digital thermometers. In addition, the paper has proposed that correcting the non-linearity in a data acquisition by microcomputers according to this principle be a better method.