低温温度传感器比对校准装置的研制

Study Of A Cryostat For The Comparison And Calibration Of Low Temperature Thermometer

ＬＨ２、ＬＮ２为冷源．用减压降温和增压升温的方法．分别获得了１４Ｋ～３０Ｋ、６３Ｋ～１００Ｋ的浴槽温度。恒温精度优于±５０ｍＫ／２０ｍｉｎ。ＬＨ２耗量＜２．５／ｈ。ＬＮ２耗量＜０．６Ｌ／ｈ。适用于热电偶温度计和电阻温度计的比对校准。

Using LH2 and LN2 as coolant respectively, we obtain temperature from 14K to 30K and from63K to 100K in a cryostat by decreasing and increasing the saturate vapor pressure of the coolant.The temperature stability is better than ±50mK /20 min. The consumption of LH2 is less than2. 5L/h and of LN2 is less than 0. 6L/h. The cryostat is suited to the integral comparison and calibration between thermocouple and resistance thermometer as well as to the electricity measurement in low temperature.