约翰逊噪声精确测温系统的虚拟仪器实现

Johnson Noise Precise Temperature Measuring System's Realizing of Virtual Instrument

研究了一种利用约翰逊噪声进行测温的方法,即采用测量器件内部热运动引起的约翰逊噪声的方法来实现温度值的测量;分析了在采集、传输约翰逊噪声电压信号过程中消除各种外部干扰的信号处理问题,提出了采用间接互相关分析法来降噪的方法,以提高测量精度并实现温度信号的精确测量;结合虚拟仪器技术,构造了不需要周期性标定的能实现无人值守运行的高精度温度测量系统,解决了在恶劣环境中的温度测量难题。

Study a new temperature--measuring method by measuring the Johnson noise which is caused by the random thermal motions of electrons in all conductors. It analyzes the signal processing problem when collect, transform the thermal noise voltage and eliminate the external interfere and the noise of amplifiers and give the method of limiting the noise using indirect cross correlation analyzing technology, Increases the measuring accuracy to realize the temperature signal precision measuring. By the technology of virtual instrument, design the high--precising temperature--measuring system which will not need the periodical marking and realizes automatic monitoring. Solve difficult problem in harsh circumstance temperature measurement.