Research On SAW Temperature Sensing System And Antenna For Smart Grid

Surface Acoustic Wave (SAW) technology which began in the late1970s graduallydeveloped into a cross subject combinating with a set of acoustics, piezoelectric andsemiconductor technology. After forty years development, the devices based on the SAWtechnology was widely used in wireless communications, signal processing and sensorfield.In recent years, with the development of Smart Grid and the Internet of things,domestic and overseas pay much attention on sensor technology. Especially in theconstruction of the intelligent power grid, in order to optimize the allocation of resourcesand build a more stable and reliable power grid, the power equipment on-line conditionmonitoring technology has been highly appreciated. The core of the condition monitoringis sensor technology, so development of condition monitoring put forward higher requeston sensor technology. Such as in temperature condition monitoring of grid equipment,electrical safety distance and high insulation require monitoring system using wirelessmonitoring; Long-term reliable operation of the power system require that monitoringdevice has long maintenance cycle; The harsh environment require monitoring device hasgood stability; Different types and different specifications equipment request monitoringdevice can flexibly construct different scale system. Under these restrictions, the traditionalinfrared technology, active wireless solutions, optical fiber sensing technology failed tomeet the requirements.So when surface acoustic wave sensors is designed for condition monitoring,becauseof its advantages of wireless telemetry, passive, strong anti-interference ability, highprecision, low cost, and multipurpose, it shows huge potential in on-line conditionmonitoring. This paper focuses on the demand of on-line condition monitoring of electricpower equipment, researches the temperature sensing system for power grid applicationbased on SAW technology. In a very sort of pragmatic sense, sensors and reader of thesensing system are designed, optimization design of antenna unit is done for solving the problem of sensing distance, sensing stability and practicality.The wireless temperature sensing system is researched in three parts: sensor unit,reader system and antenna. The first chapter analyzes the SAW technology and thepresent situation; The second chapter discusses the principle of the sensing unit, proposes adesign method of SAW sensor; Based on the foundation of SAW sensor design, the thirdchapter develops automatic testing system for sensor verification based on networkanalysis instrument; The fourth chapter analyzes the effect of antenna in wireless sensingsystem, and designs different antenna for practical application; Chapter5synthesizes theabove research to construct passive wireless sensor system and network; The sixth chaptersummarizes the article and discusses the prospect of SAW technology.