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长度实物标准器(如量块、线纹尺等)的高精度测量装置中对温度的控制和测量十分重要,在较小的温度变化范围内,采用热电偶结合铂电阻温度计的测量方法实现了温度的精确测量。本文详细叙述了该系统温度测量不确定度的来源及大小,最后得出温度测量的扩展不确定度小于5mK。
Length of the physical standard (such as measuring block, line ruler, etc.) of high-precision measurement device temperature control and measurement is very important in a small temperature range, the use of thermocouple platinum resistance thermometer measurement method to achieve Accurate temperature measurement. This article describes in detail the source and size of the system temperature measurement uncertainty, and finally concludes that the extended uncertainty of temperature measurement is less than 5mK.