汽轮机蒸汽湿度测量系统的频率跟踪设计  

Frequency-tracking design of the turbine steam humidity measurement system

作　　者：张淑娥[1] 牛永芳[1] 

机构地区：[1]华北电力大学电子与通信工程,河北保定071003

出　　处：《国外电子元器件》2008年第12期3-5,共3页International Electronic Elements

基　　金：国家自然科学基金资助项目(50676031);河北省自然科学基金资助项目(F2004000505)

摘　　要：在蒸汽湿度测量系统中,为解决频率跟踪时延过长问题,提出了一种新的频率跟踪方法。根据微波谐振腔对不同频率输入信号的调制作用,通过鉴幅、鉴相判断输入信号频率与微波谐振腔谐振频率的关系,进而利用单片机控制压控振荡器(VCO)的输出频率,从而减小频率跟踪的时延,并实现频率跟踪的智能化。In the steam humidity measurement system, in order to salve the problem that the delay of frequency tracking isn＇t as short as we expected,this paper proposes a new kind of method for tracing frequency.According to the modulation of microwave cavity on different input signals,this paper judges the relationship between the frequency of input signal and the reso- nant frequency of microwave cavity through amplitude discrimination and phase demodulation,then,we use MCU to control the output frequency of VCO to minimize the delay of frequency tracking and realize the intelligence of frequency tracing.

关 键 词：凝汽式汽轮机 单片机 谐振 鉴别器 智能化/蒸汽湿度测量 微波谐振腔 

分 类 号：TP272[自动化与计算机技术—检测技术与自动化装置]