基于加速度传感器MMA8451的滑坡监测系统设计

摘要

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，ZigBee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 land-slide monitoring.Based on this high-performance sensor, ZigBee module terminal node (TND) passes the rod dis-placement 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 dis -placement 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 .