本文得到陕西省科学自然基金( 2004F44 ) 陕西省教育厅专项研究计划( 05JK143 ) 陕西科技大学校级自选科研项目(ZX05-42)陕西科技大学科研启动基金( BJ05-5 )的资助基于互相关分析的约翰逊噪声测温法研究李秦君 吕岑(陕西科技大学电信学院陕西咸阳712081) 摘要: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。关键词:约翰逊噪声,测温, 互相关分析,互功率频谱密度函数 中图分类号: TP202 +.4 文献标识码: A Johnson Noise Thermometry Research Based on Cross Correlation Analysis LI Qin-jun, LU Cen (College of Electric and Electronic Engineer ing of Shaanxi University of Science and Technology ,Xianyang Shaanxi 712081 ,China) Abstract: Johnson noise, which is a result of fundamental physics, is caused by the random thermal motions of electrons in all conductors. Its fundamental nature allows us to construct temperature measurement systems that do not requ ire periodic calibration. Thus long, unattended operating intervals are feasible. Analyzed the problems of the pr ocess 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 meth od which the indirect cross correlation analytic method to reduce noise, produced the temper ature measuring system design based on the correlation analysis. Keywords: Johnson Noise, Thermometr y, Cross Correlation Analysis ,CPSD 1 .引言约翰逊噪声通常又称为热噪声, 它与由载流子通过势垒的
