基于加速度传感器MMA8451的滑坡监测系统设计

Design of landslide monitoring system based on acceleration sensor MMA8451

采用MMA8451三轴速度传感器设计出一个低功耗、高精度的滑坡监测仪器。基于这款高性能传感器,Zig Bee模块终端节点(TND)将位移棒测得的各方向加速度信号传递到中心节点(CND),通过PC端软件算法将加速度信号转换成对应倾角。由倾角与两个位移棒间的距离可求得该位移棒的相对偏移距离,将各相对偏移距离累加算出倾斜距离。通过实验验证表明:系统功耗小,精度高,速度快,能够很好地完成了对滑坡的监测,并且能够设定安全阀值,对山体滑坡等自然灾害进行预警。

Using MMA8451 three axis acceleration sensor to design a low power,high precision instruments of landslide monitoring. Based on this high-performance sensor,Zig Bee module terminal node（ TND） passes the rod displacement measured inclination to the central node（ CND）,which will be accelerated into angle through PC client software algorithm. As inclination and the distance between the two displacement rods that can obtain relative displacement of the displacement bar,with each relative offset accumulation method finding the maximum offset. The experiment shows that： the low system power consumption,high precision,high speed,so can be well done for landslide monitoring. At the same time,the ability to set security thresholds for landslides and other natural disaster warnings is of high availability.