Implementation Of Tempreture Sensors System Based On Wireless Power Transfer

The Wireless Sensor System based on wireless power transfer, which powers the sensor-nodes with electromagnetic coupling and completes measurement and data transmission, integrates sensor technology, wireless communication technology, and wireless power transfer technology. The active wireless sensor system is researched and applied in lots of domains such as food transportation, warehouse management, agriculture, and industrial monitoring. The Passive Wireless Sensor Systems are based on RFID sensors, which mainly used in food security detecting.This thesis presents a new Temperature Sensor System based on wireless power transfer in view of the characteristic of the active wireless sensor system and passive RFID sensor system. The contents include:(1) Design and implement the wireless power transfer circuit. Analyse the characteristic of wireless power transfer by electromagnetic coupling, design the wireless power transfer circuit based on the coupled PCB windings circuit, and implement the loose-coupled wireless power transfer by means of resonance coupling, impedance transform and so on, which validates the theoretical results.(2) Design and implement the sensor and communication circuit. Design the Wireless Sensor System that comprise a host and a guest sensor-node, implement the radio communication, temperature sensor and interface circuit.(3) Design the software of the passive sensor system. Design a node software with the function of atuo-synchronized communication according to the characteristic of temperature sensor system and low-power dissipation of the guest sensor-node, and implement the passive wireless temperature measurement based on wireless power transfer.At the end , it presents some content and solution, which could be improved and researched in future.