基于G-M制冷机的低温温度计全自动标定系统

Automatic calibration system of cryogenic thermometers based on a G-M cryocooler

基于两级G-M制冷机搭建了低温温度计全自动标定系统。通过PID温控仪和LabVIEW编程,实现了程序化自动控温、数据处理和报表输出一体化标定流程。提出了结合基于热阻尼的稳态控温标定和自然升温动态标定相结合的方法,不仅实现了4.2—290 K宽广温区内±0.05 K以内的标定精度水平,而且有效降低了等温载体控温点的标定时长,使标定效率比现有技术提高了2—4倍。

An automatic calibration system for low temperature thermometers was built based on a two stage G-M cryocooler. The integrated calibration process of automatic temperature control,data processing and report export is realized through a PID temperature controller and LabVIEW programming. The combination of steady-state calibration and dynamic calibration method was proposed,by which not only the± 0. 05 K calibration accuracy during large temperature range of 4. 2—290 K was achieved,but also the calibration cycle of each temperature control point of isothermal block was significantly shortened,thus the calibration efficiency is 2—4 times higher than the existing system.