The design and development of a wireless sensor network for soil moisture measurement in an unlevelled 10 km × 10 km area, is described. It was specifically deployed for the characterization of a reference area, ...The design and development of a wireless sensor network for soil moisture measurement in an unlevelled 10 km × 10 km area, is described. It was specifically deployed for the characterization of a reference area, in campaigns of calibration and validation of the space mission SMOS (Soil Moisture and Ocean Salinity), but the system is easily extensible to monitor other climatic or environmental variables, as well as to other regions of ecological interest. The network consists of a number of automatic measurement stations, strategically placed following soil homogeneity and land uses criteria. Every station includes acquisition, conditioning and communication systems. The electronics are battery operated with the help of solar cells, in order to have a total autonomous system. The collected data is then transmitted through long radio links, with ling ranges above 8 km. A standard PC linked to internet is finally used in order to control the whole network, to store the data, and to allow the remote access to the real-time data.展开更多
针对煤矿井下工作场景恶劣复杂、人员健康及环境参数监控难度大、易造成安全事故等问题,采用物联网技术,设计了一种基于无线传感器网络(Wireless Sensor Networks,WSN)和射频识别(Radio Frequency Identification,RFID)的矿井作业人员...针对煤矿井下工作场景恶劣复杂、人员健康及环境参数监控难度大、易造成安全事故等问题,采用物联网技术,设计了一种基于无线传感器网络(Wireless Sensor Networks,WSN)和射频识别(Radio Frequency Identification,RFID)的矿井作业人员健康监测系统。该系统利用WSN实时监控人体的心率、血氧及井下环境温湿度、气体浓度等数据;利用RFID技术定位井下作业人员;将所采集信息数据传输至服务器实时检测,实现安全预警并及时定位救援,从而远程监测作业人员健康。展开更多
The most important elements of “intellectual networks” (Smart Grid) are the systems of monitoring the parameters of electrical equipment. Information-measuring systems (IMS), which described in this paper, were prop...The most important elements of “intellectual networks” (Smart Grid) are the systems of monitoring the parameters of electrical equipment. Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings. This paper presents an application’s experience of LVI-testing, some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control results of electrical equipment. The LVI method and short-circuit inductive reactance measurements are sensitive for detecting such faults as radial, axial winding deformations, a twisting of low-voltage or regulating winding, a losing of winding’s pressing and others.展开更多
文摘The design and development of a wireless sensor network for soil moisture measurement in an unlevelled 10 km × 10 km area, is described. It was specifically deployed for the characterization of a reference area, in campaigns of calibration and validation of the space mission SMOS (Soil Moisture and Ocean Salinity), but the system is easily extensible to monitor other climatic or environmental variables, as well as to other regions of ecological interest. The network consists of a number of automatic measurement stations, strategically placed following soil homogeneity and land uses criteria. Every station includes acquisition, conditioning and communication systems. The electronics are battery operated with the help of solar cells, in order to have a total autonomous system. The collected data is then transmitted through long radio links, with ling ranges above 8 km. A standard PC linked to internet is finally used in order to control the whole network, to store the data, and to allow the remote access to the real-time data.
文摘针对煤矿井下工作场景恶劣复杂、人员健康及环境参数监控难度大、易造成安全事故等问题,采用物联网技术,设计了一种基于无线传感器网络(Wireless Sensor Networks,WSN)和射频识别(Radio Frequency Identification,RFID)的矿井作业人员健康监测系统。该系统利用WSN实时监控人体的心率、血氧及井下环境温湿度、气体浓度等数据;利用RFID技术定位井下作业人员;将所采集信息数据传输至服务器实时检测,实现安全预警并及时定位救援,从而远程监测作业人员健康。
文摘The most important elements of “intellectual networks” (Smart Grid) are the systems of monitoring the parameters of electrical equipment. Information-measuring systems (IMS), which described in this paper, were proposed to use together with rapid digital protection against short-circuit regimes in transformer windings. This paper presents an application’s experience of LVI-testing, some results of the use of Frequency Response Analysis (FRA) to check the condition of transformer windings and infra-red control results of electrical equipment. The LVI method and short-circuit inductive reactance measurements are sensitive for detecting such faults as radial, axial winding deformations, a twisting of low-voltage or regulating winding, a losing of winding’s pressing and others.
