为了解决安全监测工程中存在的现场测点位置分散、工况区域危险、设备有线通信和供电难以保证、振弦仪器数据不稳定等问题,采用LoRa通信、协处理器和谱分析技术,研发了无线低功耗安全监测采集系统。该系统由低功耗采集单元、数据集中器和设备连接平台组成,实现了自动化采集单元低功耗运行和数据实时无线传输的功能。通过丹江口大坝自动化监测与人工观测的数据对比可知,无线低功耗安全监测采集系统准确性、完整性都与人工采集方式无明显差异,且数据频次和及时性都高于人工采集方式。该采集系统解决了工程建设施工期边坡土石坝等工程安全监测自动化实施难题,并且已经在一大批大型水利水电工程中获得了成功应用,具有很好的应用价值和推广前景。

A wireless low-power safety monitoring acquisition system is developed by adopting LoRa communication, coprocessor and spectrum analysis to tackle the problems of scattered location of measuring points, danger of working condition, difficulty of guaranteeing wired communication and power supply of equipment, and unstable data of vibrating instrument. Consisting of low-power acquisition unit, data concentrator and equipment connection platform, the system transmits real-time wireless data with low-power operation of the automatic acquisition unit. The system is applied to the automatic monitoring of Danjiangkou Dam. Result manifests that the automatic monitoring result does not differ from artificial observation result in terms of accuracy and integrity obviously, and moreover, the frequency and timeliness of the monitored data are higher than those of the observed data. In conclusion, the proposed system solves the problem of safety monitoring automation for slopes and earth-rock dams in construction period, and has good application value and promotion prospect.