相位检测在微弱信号测量中的应用  

Application of Phase Detecting in Weak Signal Measurement

作　　者：陈忧先[1] 

机构地区：[1]东华大学信息学院,上海200051

出　　处：《仪表技术》2005年第4期14-15,共2页Instrumentation Technology

摘　　要：在非接触测量旋转物体内部温度时,所获取的反馈信号相当微弱,有可能会受到瞬间低电平信号的干扰。本文介绍一种利用相位检测,来判断所获取的反馈信号是真是假,从而锁定真信号并正确显示被测对象温度的方法。The feedback signal gained is rather weak when measuring the inner temperature of a rotator by non-contact way, And sometimes this signal is interfered with some other low level signal else. In order to show the temperature correctly, a method of judging true feedback signal by the use of phase detecting was introduced in this paper.

关 键 词：反馈信号 RC网络 自然频率 

分 类 号：TP935[自动化与计算机技术] TH811[机械工程—仪器科学与技术]