Research On Virtual Instruments Test System Of Coal Mine Environmental Parameters

In recent years, accidents often took place in coal mines. Therefore, there were great financial losses and many workers lost their life. And there are mainly three disadvantages in the present test system. First of all, data are transmitted with a low speed. Secondly, present sensors are not accurate enough, not stable enough and they can't resist interference enough. Thirdly, means of processing information are not advanced enough in the present system, and all kinds of environmental parameters can't be processed comprehensively. Therefore, real-time monitoring data are not accurate and mistakes may be caused. Based on the disadvantages above, it is an inevitable development tendency to develop a security system using more advanced techniques.In the paper, a design project of measuring environmental parameters is put forward. In the project, lower computers monitor devices on the spot, and upper computers are responsible for central administrators. And communications are realized using field bus. In the project, modern measuring technique of PC is combined with traditional measuring theory, the project adopts modularization design methods using LabVIEW graphic programming language. Therefore, the real-time performance, reliability and stability can be guaranteed. In the system, the density of gas and temperature can be displayed in time, analyzed, stored and inquired by realizing several sub-modules such as acquisition and processing of gas, database administration and generating reports and so on.In the upper computer, six modules are designed, they are modules of parameters setting, data acquisition and processing, curve displaying, overlimits warning, data stored and inquired and generating reports and print. The system is realized by using LabVIEW language and there are many advantages such as easy operation methods, high reliability, easy maintenance, interactive graphical interfaces. The system mainly realizes functions as fallows, program control; monitoring processes of measuring; recording, sorting and analyzing measuring results; displaying measuring information by virtue of relative interface in the process of measuring and mastering operating status of the system.It is turned out that virtual instruments test system of coal mine environmental parameters is satisfactory. The system provides an excellent design project for other measurement systems and it can be used in engineering.