The Software Design Of Multipoint Radon Continuous Measuring System

A various sources of radiation exist in nature, we usually say that the radon which means 222 Rn, it is a major source of natural radiation in the nature and its content depends on the content of uranium in nature; Radon decay generates radon daughters, we usually say that the radon daughters which mean short life radon daughters, them are 218 Po, 214 Pb, 214 Bi,214Po and 210Pb; Radon is a kind of inert gas which is easy to be adsorded by solids and dissolved in water, radon and its daughters will form radioactive aerosols pollute environment;The research of radon had ever been made to be major projects by nation several times,the monitoring and measurement of radon are preconditions for further study of radon.At present, with the establishment of the National Security Council, nation puts forward new requirements on environmental protection and safety of radiation, a lot of radioactive places need to be unmanned and continuous monitoring to ensure safe such as: geological disasters region, uranium tail mine, removing shaft of uranium retired place of radioactive equipment,however, most measuring instruments mainly has following several problems on monitoring:1.Them can only do single point measurement and the data measured by different point can not be comparabled when do the multipoint measurement;2.Them are unable to achieve automatic continuous monitoring and remote control, only can worked by manual operation; 3.There is no strong database support and unified management functions which cause that it is not convenient to do data analysis and monitoring, them only can do small range measurement of radon concentration with lower visualization degree. Therefore,it is need to develop a rapid and reliable network distributed system for multipoint continuous monitoring on single chip computer, data communication, database and visualization technology,which can realize long-term unattended and continuous real-time monitoring of radon concentration in a wide range of space to meet the current requirements of the state.The dissertation explains that how to use MFC framework of VC++6.0 integrated development environment to do the design and implementation of software system on the hardware platform of radon and thorium measuring instrument; The system uses the modular design thought, which including chart display module, GPS positioning module,data management module, control module, database management and serial communication module. In comprehensive consideration, We use the C and C++ language to program the system, the Tee Chart Active X to develop the chart display module for display graph and Map X Active X to develop GPS positioning module; The data management module will be divided into three parts : charts and numbers management module, report exporting and printing module,data query and statistics module; We use CJlibrary interface library to develop the numbers management module,Ms Flex Grid Active X to develop the report exporting and printing module,Access database and SQL query language to develop the data query and statistics module;The Operation control module will be worked in Pdu messages way,we use ADO Active X to control the database management module, asynchronous serial API function with multiple threads and kernel event objects to control the serial communication module.In order to verify the function of the system, we use China Mobile Fetion to simulate that instruments sending the measured data to the system, the experiment shows that this system has following features:a friendly interface, easy to using,data receiving completion, excellent and reliable performance,which can also support a large number of instruments working online at the same time.