国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

To solve the problem of low measurement accuracy and on-line monitoring for the mine dust concentration, the high-preceision mine dust concentration is designed with the charge induction principle, whose output induced current has a good linear relationship with the dust concentration. The distributed mine dust concentration on-line monitoring system composed of dust monitoring nodes, fan controller, data station, monitoring centre and transport network is designed using three levels management structure. The dust monitoring nodes make up a star structure with the data station via ZigBee network, and collect the dust concentration in the surrounding environment, sending them to the data station periodically. The data station connectiong to the monitoring centre is designed with C/S architecture, receives the data from all the monitoring nodes and send them to the server in the monitoring centre after packing. The monitoring centre receives, processes, analyzes and displays all the data from data station, and at last store them to the Data Base ACCESS2003. It can send out alarming automatically when the high concentration of dust occures in an area, and controls the corresponding fan increase more work so that the dust concentration can be kept in a safty range. The test results show that the designed dust concentration sensor has a high accuracy with the average error of only 2.95%, and the dust concentration on-line monitoring system works reliable. 