Johnson Noise Thermometry Research Based on Cross Correlation Analysis;
基于互相关分析的约翰逊噪声测温法研究
With the classical Johnson noise, 1/f noise and radiation noise, the dependence of noise and Signal-to-Noise on different parameters were simulated.
针对微测辐射热计中的约翰逊噪声、1/f噪声与辐射噪声,着重探讨了微测辐射热计的偏置电压、电阻、噪声带宽等参数对其噪声和信噪比的影响,并根据分析仿真结果,提出了三种增加微测辐射热计信噪比的方法。
Base on the attribute about Johnson Noise is that the basic principle representation of heat locomotion of electronics,construct that accurate temperature measurement system dispense with cyclicity demarcate.
基于约翰逊噪声是电子热运动即器件电阻的本质表现法的属性,构建了不要求周期性定标的精确温度测量系统,分析了实现精确测温所遇到的理论性问题并提出了具体解决方案,同时考虑了测温法中涉及到的两个信号处理的概念,采用间接互相关分析算法论证了除噪效果的应用,给出了系统信号测量及处理的方案。
Firstly,the method that makes potentiometer far from the input terminal of amplifier and puts the potentiometer on the side of big signal can decrease the effect of noise voltage on whole circuit to a certain extent.
其中 ,使电位器的滑动接点远离放大器的输入端及尽可能将电位器用在大信号一侧的方法 ,能在一定程度上减小噪声电压对整个电路的影响 ;在继电器线圈两端并接高速放电二极管和 RC吸收电路能大大消弱继电器工作时线圈两端产生的负脉冲电压 ;用金属壳将高输入阻抗放大器的输入端屏蔽可消除各种外界干扰信号对放大器的干扰 ,而在高输入阻抗放大器的输入端接入隔离环可减少电源线漏电等对放大器的影响 ;在数字电路的终端连接终端电阻会明显改善数字电路中易出现的终端反射效
The noise voltage of the designed low noise amplifier is 1.
本文介绍低噪声放大器噪声来源、不同种类放大器噪声特性和匹配方法,重点论证低频低噪声放大电路设计和放大器噪声性能分析,设计的电路噪声电压实测为1。
Johnson Noise Precise Temperature Measuring System's Realizing of Virtual Instrument
约翰逊噪声精确测温系统的虚拟仪器实现
Kennedy is Kennedy; Johnson is Johnson.
肯尼迪就是肯尼迪，约翰逊就是约翰逊。
Effects of Thermal Noise on Volt-ampere Characteristic Curve of Josephson Effect
热噪声对约瑟夫逊效应中伏安特性曲线的影响
Nier-Johnson mass analyser
尼尔-约翰逊质量分析器
Larner-Johnson valve
拉诺－约翰逊式针阀
Could I speak to Mr. Johnson, please?
我想和约翰逊先生说话。
Mr. Johnson, I presume?
您就是约翰逊先生吧？
Judge Johnson recessed the trial.
约翰逊法官宣布休庭。
Thank you, Mr. Johnson.
谢谢你。约翰逊先生。
Emeritus Professor Johnson
约翰逊荣誉退休教授.
Mr Johnson went into business for himself.
约翰逊先生自营生意。
Please give Mr. Hohnson my best regards .
请代向约翰逊先生致意。
Johnson got the gold medal in the 100 metres.
约翰逊获得百米金牌.
Mrs.Johnson likes to take a hand at cards.
约翰逊太太喜欢打牌。
Ms. Francesca Johnson
弗朗西丝卡.约翰逊女士
Mr. Johnson is 55 years old;
约翰逊先生现年55岁；
Mr Johnson has a family of five.
约翰逊先生有五个子女。
