基于TOF的海潮高度在线测量系统设计

为提高现有的潮汐及水位仪器(如浮子式、超声波式、雷达式水位计)在线测量的实时性和稳定性,减小仪器的体积、成本和功耗,设计了一种基于TOF(Time of Flight,即飞行时间法)三维成像测距并结合XBEE MESH技术的无线网络测量系统.传感节点使用准直的850 nm红外LED发射光源,采用ARM+CPLD控制和提取EPC610 TOF成像芯片的有效测量数据并进行实时校正和计算,单个测量节点能实现1 m~7 m范围内误差±1.25 cm,测量速率为500次/秒的高速测量,其尺寸只有2.5 cm×2.5 cm大小.无线网络部分采用Peer-to-Peer MESH自组织网络结构,采用无线模块主动唤醒传感器,同步和异步休眠相结合的控制形式大大降低了功耗.

The design of tidal level measurement system based on TOF

In order to improve the real-time performance and stabilityof the existing tide and water level measuring instrument,such as float type,ultrasonic,radar level gauge,reduce the size,the cost and power consumption of the instrument,this paper describes the design of a wireless sensor network system based on TOF(Time of Flight) three-dimensional imaging and XBEE MESH Technology. The sensor nodeuses 850 nm focused infrared LED as emission source,the ARM + CPLD architecture to control and extract the effective measurement data of EPC610 TOF imaging chip for real-time correction and calculation. A single measurement node can achieve an er-ror of± 1.25 cm at the range of 1 m~7 m,high-speed measurement rate at 500 times/sec and its size is only 2.5 cm× 2.5 cm. The wireless network uses Peer-to-Peer MESH self-organizing technology,using the wireless module to awaken the sensoractively and the combination of synchronous and asynchronous sleep mode ,thus greatly reduced the power consumption.