基于互相关分析的约翰逊噪声测温法研究

Johnson Noise Thermometry Research Based on Cross Correlation Analysis

约翰逊噪声是由在导体中的电子的随机热运动产生的基本的物理学结果。它的根本性质允许人们构建不要求周期性定标的温度测量系统。因而长期,无人值守的运行是可行的。分析了在采集、传输约翰逊噪声电压信号过程中消除外部干扰和各级放大器的噪声的信号处理问题,提出了采用间接互相关分析法来降噪的方法,同时给出了基于相关分析的测温系统设计。

Johnson noise, which is a result of fundamental physics, is caused by the random thermal motions of electrons in all conductors. It＇s fundamental nature allows us to construct temperature measurement systems that do not require periodic calibration. Thus long, unat- tended operating intervals are feasible. Analyzed the problems of the process about collect and transmit the Johnson noise voltage signal to eliminate exterior disturbance and all levels of amplifiers noise signal processing question, proposed to use method which the indirect cross correlation analytic method to reduce noise, produced the temperature measuring system design based on the correlation analysis.