A novel physical parameters measuring method using wireless passive sensor in harsh environment

This paper presents a novel physical parameters measuring method using wireless passive microwave resonator for harsh environment. Even if ordinarily physical parameters sensors are very attractive for a lot of applications, they suffer from weak energy autonomy and they are not compatible with harsh environment. The sensors must work reliably in the high temperature or high pressure environment, and we can monitor the physical parameters without connecting the sensors directly. In order to overcome these problems, we have developed a new kind of wireless parameters sensor system using resonator. The wireless passive physical parameters sensor works in harsh environment. The receiving unit in the general environment can receive and process the reflect signal of the resonant frequency. When the physical parameters of monitoring are changed, the resonant frequency will be different. Accurate online monitoring of physical parameters is highly desirable inside various harsh environments. This method avoids the constraints of the harsh environments, reduces the cost and difficulty of the parameters sensor system. At the same time, this method in this paper can survive these harsh environments and provide continuous monitoring. In addition, this paper presents a way to suppress the background clutter effectively. The method not only can improve the receiving efficiency, but also can reduce the effect of background clutter on the physical parameters extraction in the harsh environments.