Research And Application Of An Intelligent Wireless Sensor System

In the multipoint distributed vibration test of large structure,long cables are usually needed for a conventional vibration data acquisition system.It may lead to signal attenuation,tedious wiring,and high cost.Therefore,an intelligent wireless sensor system with low power embedded processors in this paper is designed to be composed of many nodes forming meshwork,synchronous data acquisition function and data storage function.It has lower cost,smaller size and less cables to reduce workload and improve work efficiency compared with traditional data acquisition systems based on cable network.The hardware circuit and software system are designed.The main research contents in this paper include:(1)The overall design of the intelligent wireless sensor system is described and hardware chips are chosen;(2)The hardware circuit is designed.STM32 is chosen to build minimal system and it realizes differential amplifier transmission of AC coupling signal.The digital mode conversion function of the ?-? ADC is completed.SD card is used for data storage.Multi-node synchronous network is built based on wireless module and GPS.(3)The software system is designed.A high-speed anti mixing filter based on FIR digital filter is implemented,which realizes high precision and over sampling data acquisition.Data storage is realized by queue buffer.(4)The performance test of each module in the sensor system is completed.The system is compared with the commercial cable data acquisition system,and the research shows that the sensor system designed in this paper can effectively complete the structural vibration test and realize the high-speed sampling and storage of data.