基于锁定放大的砂石含水量微波测试系统研究  

Study of the Microwave Detective System of the Water Content of Grit Based on Lock-in Amplifier

作　　者：孙士平[1] 毛宗源[2] 

机构地区：[1]长江大学电子信息学院,湖北荆州434023 [2]华南理工大学电信学院,广州510640

出　　处：《中国仪器仪表》2006年第9期38-40,共3页China Instrumentation

基　　金：广东省自然科学基金资助项目(011626);长江大学自然科学基金资助项目(2003Z0931)

摘　　要：文中介绍了微波法测量建筑砂石含水量测量系统。该系统由于引入了正交锁定放大器和本底噪声扣除的测量方法,使测量系统避开了因器件的不稳定性、电路的静态漂移、环境干扰噪声和器件噪声等对测量精度和稳定性带来的影响,实验表明测量精度和稳定性优于传统测量系统。The detective system of the microwave law detecting building grit water content is discussed in the article, in this detective system, as it provided the measuring technique of orthogonal lock-in amplifier and the background noise deducts, the measurement system avoiding effects on the measuring accuracy and stability which caused by the components＇ instability, the static drifting of the electric circuit, the environment disturbance noise and the component noise and so on, the experiment indicates that it is superior to the traditional measuring system on the precision and stability of the measuring.

关 键 词：微波 锁定放大 本底噪声 介电常数 正交 

分 类 号：TU521[建筑科学—建筑技术科学]