基于Pt100的高精度测温电路

High-precision temperature measurement circuit based on Pt100

多通道双折射滤光器是太阳磁场观测的重要仪器,旨为提高太阳单色观测能力.本滤光器中双折射晶体的折射率对温度变化敏感,因此需对环境进行恒温控制.温度测量是恒温控制的前提.本文设计并完成一个基于Pt100的高精度温度测量系统,给出了高精度测温原理,温度采集系统电路及温度校准测量方案.利用RR9710,TD—1等高精度测温仪对精度进行间接标定.测试结果表明:本温度测量系统性能稳定,小型高效,测量精度可达到0.02℃.

The multi-channel birefringent filter,which is designed to improve the ability to observe the monochromatic property of the sun,is regarded as an important instrument for solar magnetic field observation.The refractive index of the birefringent crystal in the optical filter issensitive to temperature.Therefore,it is necessary to control constant temperature.Measuring temperature is premise of constant temperature control.A high-precision temperature measurement system based on Pt100 is studied and designed.The principle of high-precision temperature measurement,the circuit of temperature acquisition system and the scheme of temperature correction are provided.Finally,the high-precision temperature measurement instruments,such as RR9710,TD-1,are used to calibrate accuracy indirectly.The test results show that the temperature measurement system is stable and efficient.The accuracy could be reached to 0.02 ℃.